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Date:	Sun, 15 Jun 2014 11:32:41 +0200
From:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	David Airlie <airlied@...ux.ie>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
CC:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 3/7] drm: add Atmel HLCDC Display Controller support



On 06/09/2014 06:04 PM, Boris BREZILLON wrote:
> The Atmel HLCDC (High LCD Controller) IP available on some Atmel SoCs (i.e.
> at91sam9n12, at91sam9x5 family or sama5d3 family) provides a display
> controller device.
> 
> This display controller support at least one primary plane and might
> provide several overlays and an hardware cursor depending on the IP
> version.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> ---
>  .../devicetree/bindings/drm/atmel-hlcdc-dc.txt     |  59 ++
>  drivers/gpu/drm/Kconfig                            |   2 +
>  drivers/gpu/drm/Makefile                           |   1 +
>  drivers/gpu/drm/atmel-hlcdc/Kconfig                |  11 +
>  drivers/gpu/drm/atmel-hlcdc/Makefile               |   7 +
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c     | 529 ++++++++++++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c       | 477 ++++++++++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h       | 178 ++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c    | 701 +++++++++++++++++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h    | 417 ++++++++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c    | 351 +++++++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c    | 658 +++++++++++++++++++
>  drivers/gpu/drm/atmel_hlcdc/Kconfig                |  11 +
>  drivers/gpu/drm/atmel_hlcdc/Makefile               |   8 +
>  14 files changed, 3410 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/Kconfig
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/Makefile
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
>  create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>  create mode 100644 drivers/gpu/drm/atmel_hlcdc/Kconfig
>  create mode 100644 drivers/gpu/drm/atmel_hlcdc/Makefile
> 
> diff --git a/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt b/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
> new file mode 100644
> index 0000000..594bdb2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
> @@ -0,0 +1,59 @@
> +Device-Tree bindings for Atmel's HLCDC (High LCD Controller) DRM driver
> +
> +The Atmel HLCDC Display Controller is subdevice of the HLCDC MFD device.
> +See Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt for more details.
> +
> +Required properties:
> + - compatible: value should be one of the following:
> +   "atmel,hlcdc-dc"
> + - interrupts: the HLCDC interrupt definition
> + - pinctrl-names: the pin control state names. Should contain "default",
> +   "rgb-444", "rgb-565", "rgb-666" and "rgb-888".
> + - pinctrl-[0-4]: should contain the pinctrl states described by pinctrl
> +   names.
> + - atmel,panel: Should contain a phandle with 2 parameters.
> +   The first cell is a phandle to a DRM panel device
> +   The second cell encodes the RGB mode, which can take the following values:
> +   * 0: RGB444
> +   * 1: RGB565
> +   * 2: RGB666
> +   * 3: RGB888
> +   The third cell encodes specific flags describing LCD signals configuration
> +   (see Atmel's datasheet for a full description of these fields):
> +   * bit 0: HSPOL: Horizontal Synchronization Pulse Polarity
> +   * bit 1: VSPOL: Vertical Synchronization Pulse Polarity
> +   * bit 2: VSPDLYS: Vertical Synchronization Pulse Start
> +   * bit 3: VSPDLYE: Vertical Synchronization Pulse End
> +   * bit 4: DISPPOL: Display Signal Polarity
> +   * bit 7: DISPDLY: LCD Controller Display Power Signal Synchronization
> +   * bit 12: VSPSU: LCD Controller Vertical synchronization Pulse Setup Configuration
> +   * bit 13: VSPHO: LCD Controller Vertical synchronization Pulse Hold Configuration
> +   * bit 16-20: GUARDTIME: LCD DISPLAY Guard Time
> +
> +Example:
> +
> +	hlcdc: hlcdc@...30000 {
> +		compatible = "atmel,sama5d3-hlcdc";
> +		reg = <0xf0030000 0x2000>;
> +		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
> +		clock-names = "periph_clk","sys_clk", "slow_clk";
> +		status = "disabled";
> +
> +		hlcdc-display-controller {
> +			compatible = "atmel,hlcdc-dc";
> +			interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
> +			pinctrl-names = "default", "rgb-444", "rgb-565", "rgb-666", "rgb-888";
> +			pinctrl-0 = <&pinctrl_lcd_base>;
> +			pinctrl-1 = <&pinctrl_lcd_base &pinctrl_lcd_rgb444>;
> +			pinctrl-2 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>;
> +			pinctrl-3 = <&pinctrl_lcd_base &pinctrl_lcd_rgb666>;
> +			pinctrl-4 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
> +		};
> +
> +		hlcdc_pwm: hlcdc-pwm {
> +			compatible = "atmel,hlcdc-pwm";
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&pinctrl_lcd_pwm>;
> +			#pwm-cells = <3>;
> +		};
> +	};
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index d1cc2f6..df6f0c1 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -182,6 +182,8 @@ source "drivers/gpu/drm/cirrus/Kconfig"
>  
>  source "drivers/gpu/drm/armada/Kconfig"
>  
> +source "drivers/gpu/drm/atmel-hlcdc/Kconfig"
> +
>  source "drivers/gpu/drm/rcar-du/Kconfig"
>  
>  source "drivers/gpu/drm/shmobile/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 48e38ba..28c8a61 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_GMA500) += gma500/
>  obj-$(CONFIG_DRM_UDL) += udl/
>  obj-$(CONFIG_DRM_AST) += ast/
>  obj-$(CONFIG_DRM_ARMADA) += armada/
> +obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
>  obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
>  obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
>  obj-$(CONFIG_DRM_OMAP)	+= omapdrm/
> diff --git a/drivers/gpu/drm/atmel-hlcdc/Kconfig b/drivers/gpu/drm/atmel-hlcdc/Kconfig
> new file mode 100644
> index 0000000..bc07315
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/Kconfig
> @@ -0,0 +1,11 @@
> +config DRM_ATMEL_HLCDC
> +	tristate "DRM Support for ATMEL HLCDC Display Controller"
> +	depends on DRM && OF && MFD_ATMEL_HLCDC && COMMON_CLK
> +	select DRM_GEM_CMA_HELPER
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_FB_HELPER
> +	select DRM_KMS_CMA_HELPER
> +	select DRM_PANEL
> +	help
> +	  Choose this option if you have an ATMEL SoC with an HLCDC display
> +	  controller (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family).
> diff --git a/drivers/gpu/drm/atmel-hlcdc/Makefile b/drivers/gpu/drm/atmel-hlcdc/Makefile
> new file mode 100644
> index 0000000..bf9fe0b
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/Makefile
> @@ -0,0 +1,7 @@
> +atmel-hlcdc-dc-y := atmel_hlcdc_crtc.o \
> +		atmel_hlcdc_dc.o \
> +		atmel_hlcdc_layer.o \
> +		atmel_hlcdc_panel.o \
> +		atmel_hlcdc_plane.o
> +
> +obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc-dc.o
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> new file mode 100644
> index 0000000..a18492e
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> @@ -0,0 +1,529 @@
> +/*
> + * Copyright (C) 2014 Traphandler
> + * Copyright (C) 2014 Free Electrons
> + *
> + * Author: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drmP.h>
> +
> +#include <video/videomode.h>
> +
> +#include "atmel_hlcdc_dc.h"
> +
> +/**
> + * Structure storing hardware cursor informations like its position, its size
> + * or the GEM object currently used to display the HW cursor.
> + *
> + * @gem: the cursor GEM object
> + * @pitch: GEM object pitch
> + * @height: cursor height in pixels
> + * @width: cursor width in pixels
> + * @x: cursor x position
> + * @y: cursor y position
> + * @offset: start offset from the provided buffer
> + * @patched_height: patched height value after adapting the image size
> + *		    depending on cursor position
> + * @patched_width: patched width value after adapting the image size depending
> + *		   on cursor position
> + * @patched_x: patched x value after adapting to cursor position (positive
> + *             value)
> + * @patched_y: patched x value after adapting to cursor position (positive
> + *             value)
> + */
> +struct atmel_hlcdc_crtc_cursor_info {
> +	struct drm_gem_cma_object *gem;
> +	unsigned int pitch;
> +	u32 height;
> +	u32 width;
> +	int x;
> +	int y;
> +
> +	/*
> +	 * These fields are automatically calculated by
> +	 * atmel_hlcdc_crtc_cursor_prepare_req.
> +	 */
> +	unsigned int offset;
> +	u32 patched_height;
> +	u32 patched_width;
> +	int patched_x;
> +	int patched_y;
> +};
> +
> +/**
> + * Structure storing HW cursor status.
> + *
> + * @status: the current cursor status
> + * @req: the requested cursor changes
> + * @plane: the hardware cursor plane
> + * @lock: cursor lock held when modifying cursor req or status
> + */
> +struct atmel_hlcdc_crtc_cursor {
> +	struct atmel_hlcdc_crtc_cursor_info status;
> +	struct atmel_hlcdc_crtc_cursor_info req;
> +	struct atmel_hlcdc_plane *plane;
> +	struct mutex lock;
> +};
> +
> +/**
> + * Atmel HLCDC CRTC structure
> + *
> + * @base: base DRM CRTC structure
> + * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
> + * @event: pointer to the current page flip event
> + * @id: CRTC id (returned by drm_crtc_index)
> + * @dpms: DPMS mode
> + * @cursor: hardware cursor status
> + */
> +struct atmel_hlcdc_crtc {
> +	struct drm_crtc base;
> +	struct atmel_hlcdc *hlcdc;
> +	struct drm_pending_vblank_event *event;
> +	int id;
> +	int dpms;
> +	struct atmel_hlcdc_crtc_cursor cursor;
> +};
> +
> +static inline struct atmel_hlcdc_crtc *
> +drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
> +{
> +	return container_of(crtc, struct atmel_hlcdc_crtc, base);
> +}
> +
> +
> +static void atmel_hlcdc_crtc_dpms(struct drm_crtc *c, int mode)
> +{
> +	struct drm_device *dev = c->dev;
> +
> +	if (mode != DRM_MODE_DPMS_ON)
> +		mode = DRM_MODE_DPMS_OFF;
> +
> +	pm_runtime_get_sync(dev->dev);
> +
> +	if (mode == DRM_MODE_DPMS_ON)
> +		pm_runtime_forbid(dev->dev);
> +	else
> +		pm_runtime_allow(dev->dev);
> +
> +	pm_runtime_put_sync(dev->dev);
> +}
> +
> +static int atmel_hlcdc_crtc_mode_set(struct drm_crtc *c,
> +				     struct drm_display_mode *mode,
> +				     struct drm_display_mode *adjusted,
> +				     int x, int y,
> +				     struct drm_framebuffer *old_fb)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +	struct regmap *regmap = crtc->hlcdc->regmap;
> +	struct drm_plane *plane = c->primary;
> +	struct drm_framebuffer *fb;
> +	struct videomode vm;
> +
> +	vm.vfront_porch = mode->vsync_start - mode->vdisplay;
> +	vm.vback_porch = mode->vtotal - mode->vsync_end;
> +	vm.vsync_len = mode->vsync_end - mode->vsync_start;
> +	vm.hfront_porch = mode->hsync_start - mode->hdisplay;
> +	vm.hback_porch = mode->htotal - mode->hsync_end;
> +	vm.hsync_len = mode->hsync_end - mode->hsync_start;
> +
> +	if (vm.hsync_len > 0x40 || vm.hsync_len < 0 ||
> +	    vm.vsync_len > 0x40 || vm.vsync_len < 0 ||
> +	    vm.vfront_porch > 0x40 || vm.vfront_porch < 0 ||
> +	    vm.vback_porch > 0x40 || vm.vback_porch < 0 ||
> +	    vm.hfront_porch > 0x200 || vm.hfront_porch < 0 ||
> +	    vm.hback_porch > 0x200 || vm.hback_porch < 0 ||
> +	    mode->hdisplay > 2048 || mode->hdisplay < 0 ||
> +	    mode->vdisplay > 2048 || mode->vdisplay < 0)
> +		return -EINVAL;
> +
> +	regmap_write(regmap, ATMEL_HLCDC_CFG(1),
> +		     (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
> +
> +	regmap_write(regmap, ATMEL_HLCDC_CFG(2),
> +		     (vm.vfront_porch - 1) | ((vm.vback_porch - 1) << 16));
Acording to the datasheet, it's vm.vback_porch instead of
(vm.vback_porch -1).
> +
> +	regmap_write(regmap, ATMEL_HLCDC_CFG(3),
> +		     (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
> +
> +	regmap_write(regmap, ATMEL_HLCDC_CFG(4),
> +		     (mode->hdisplay - 1) | ((mode->vdisplay - 1) << 16));
> +
> +	fb = plane->fb;
> +	plane->fb = old_fb;
> +
> +	return plane->funcs->update_plane(plane, c, fb,
> +					  0, 0,
> +					  mode->hdisplay, mode->vdisplay,
> +					  c->x << 16, c->y << 16,
> +					  mode->hdisplay << 16,
> +					  mode->vdisplay << 16);
> +}
> +
> +static void atmel_hlcdc_crtc_prepare(struct drm_crtc *crtc)
> +{
> +	atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
> +}
> +
> +static void atmel_hlcdc_crtc_commit(struct drm_crtc *crtc)
> +{
> +	atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
> +}
> +
> +static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *crtc,
> +					const struct drm_display_mode *mode,
> +					struct drm_display_mode *adjusted_mode)
> +{
> +	return true;
> +}
> +
> +
> +static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
> +
> +	.mode_fixup = atmel_hlcdc_crtc_mode_fixup,
> +	.dpms = atmel_hlcdc_crtc_dpms,
> +	.mode_set = atmel_hlcdc_crtc_mode_set,
> +	.prepare = atmel_hlcdc_crtc_prepare,
> +	.commit = atmel_hlcdc_crtc_commit,
> +};
> +
> +static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +
> +	drm_crtc_cleanup(c);
> +	kfree(crtc);
> +}
> +
> +void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *c,
> +				       struct drm_file *file)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +	struct drm_pending_vblank_event *event;
> +	struct drm_device *dev = c->dev;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&dev->event_lock, flags);
> +	event = crtc->event;
> +	if (event && event->base.file_priv == file) {
> +		event->base.destroy(&event->base);
> +		drm_vblank_put(dev, crtc->id);
> +		crtc->event = NULL;
> +	}
> +	spin_unlock_irqrestore(&dev->event_lock, flags);
> +}
> +
> +static void atmel_hlcdc_crtc_finish_page_flip(void *data)
> +{
> +	struct atmel_hlcdc_crtc *crtc = data;
> +	struct drm_device *dev = crtc->base.dev;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&dev->event_lock, flags);
> +	if (crtc->event) {
> +		drm_send_vblank_event(dev, crtc->id, crtc->event);
> +		drm_vblank_put(dev, crtc->id);
> +		crtc->event = NULL;
> +	}
> +	spin_unlock_irqrestore(&dev->event_lock, flags);
> +}
> +
> +static int atmel_hlcdc_crtc_page_flip(struct drm_crtc *c,
> +				      struct drm_framebuffer *fb,
> +				      struct drm_pending_vblank_event *event,
> +				      uint32_t page_flip_flags)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +	struct drm_plane *plane = c->primary;
> +
> +	if (crtc->event)
> +		return -EBUSY;
> +
> +	if (event) {
> +		crtc->event = event;
> +		drm_vblank_get(c->dev, crtc->id);
> +	}
> +
> +	return plane->funcs->update_plane(plane, c, fb,
> +					  0, 0,
> +					  c->mode.hdisplay, c->mode.vdisplay,
> +					  c->x << 16, c->y << 16,
> +					  c->mode.hdisplay << 16,
> +					  c->mode.vdisplay << 16);
> +}
> +
> +static void atmel_hlcdc_crtc_cursor_prepare_req(struct atmel_hlcdc_crtc *crtc)
> +{
> +	int bpp = drm_format_plane_cpp(DRM_FORMAT_ARGB8888, 0);
> +	struct atmel_hlcdc_crtc_cursor_info *info = &crtc->cursor.req;
> +	int x_offset = 0;
> +	int y_offset = 0;
> +
> +	if (!info->gem) {
> +		info->width = 0;
> +		info->height = 0;
> +		info->pitch = 0;
> +		info->offset = 0;
> +		return;
> +	}
> +
> +	info->pitch = info->width * bpp;
> +
> +	if (info->x + info->width > crtc->base.mode.hdisplay)
> +		info->patched_width = crtc->base.mode.hdisplay - info->x;
> +	else
> +		info->patched_width = info->width;
> +
> +	if (info->x < 0) {
> +		info->patched_width += info->x;
> +		x_offset = -info->x;
> +		info->patched_x = 0;
> +	} else {
> +		info->patched_x = info->x;
> +	}
> +
> +	if (info->y + info->height > crtc->base.mode.vdisplay)
> +		info->patched_height = crtc->base.mode.vdisplay - info->y;
> +	else
> +		info->patched_height = info->height;
> +
> +	if (info->y < 0) {
> +		info->patched_height += info->y;
> +		y_offset = -info->y;
> +		info->patched_y = 0;
> +	} else {
> +		info->patched_y = info->y;
> +	}
> +
> +	info->offset = (x_offset * bpp) +
> +		       (y_offset * info->pitch);
> +}
> +
> +static int atmel_hlcdc_crtc_cursor_apply_req(struct atmel_hlcdc_crtc *crtc)
> +{
> +	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
> +	struct atmel_hlcdc_crtc_cursor_info *req = &crtc->cursor.req;
> +	struct atmel_hlcdc_crtc_cursor_info *status = &crtc->cursor.status;
> +	int ret;
> +
> +	if (unlikely(!plane))
> +		return -ENOTSUPP;
> +
> +	if (!req->gem ||
> +	    !req->patched_width || !req->patched_height) {
> +		ret = plane->base.funcs->disable_plane(&plane->base);
> +
> +		if (!ret)
> +			goto out;
> +		else
> +			goto err;
> +	}
> +
> +	ret = atmel_hlcdc_layer_update_start(&plane->layer);
> +	if (ret)
> +		return ret;
> +
> +	atmel_hlcdc_plane_update_general_settings(plane, DRM_FORMAT_ARGB8888);
> +
> +	ret = atmel_hlcdc_plane_update_format(plane, DRM_FORMAT_ARGB8888);
> +	if (ret)
> +		goto err;
> +
> +	ret = atmel_hlcdc_plane_update_pos_and_size(plane, &crtc->base,
> +						    req->patched_x,
> +						    req->patched_y,
> +						    req->patched_width,
> +						    req->patched_height,
> +						    0, 0,
> +						    req->patched_width,
> +						    req->patched_height);
> +	if (ret)
> +		goto err;
> +
> +	ret = atmel_hlcdc_plane_update_buffers(plane,
> +					       DRM_FORMAT_ARGB8888,
> +					       &req->gem,
> +					       &req->pitch,
> +					       &req->offset,
> +					       0, 0,
> +					       req->patched_width,
> +					       req->height);
> +	if (ret)
> +		goto err;
> +
> +	if (!plane->base.crtc)
> +		plane->base.crtc = &crtc->base;
> +
> +	atmel_hlcdc_layer_update_commit(&plane->layer);
> +
> +out:
> +	if (req->gem)
> +		drm_gem_object_reference(&req->gem->base);
> +
> +	if (status->gem)
> +		drm_gem_object_unreference_unlocked(&status->gem->base);
> +
> +	*status = *req;
> +
> +	return 0;
> +
> +err:
> +	atmel_hlcdc_layer_update_rollback(&plane->layer);
> +	return ret;
> +}
> +
> +static int atmel_hlcdc_crtc_cursor_set(struct drm_crtc *c,
> +				       struct drm_file *file_priv,
> +				       uint32_t handle,
> +				       uint32_t width, uint32_t height)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
> +	struct drm_gem_cma_object *cma_gem = NULL;
> +	int ret;
> +
> +	if (unlikely(!plane))
> +		return -ENOTSUPP;
> +
> +	mutex_lock(&crtc->cursor.lock);
> +
> +	if (handle) {
> +		struct drm_gem_object *gem;
> +
> +		gem = drm_gem_object_lookup(c->dev, file_priv, handle);
> +		if (unlikely(!gem)) {
> +			ret = -ENOENT;
> +			goto out;
> +		}
> +
> +		cma_gem = to_drm_gem_cma_obj(gem);
> +	}
> +
> +	crtc->cursor.req = crtc->cursor.status;
> +
> +	crtc->cursor.req.gem = cma_gem;
> +	crtc->cursor.req.width = width;
> +	crtc->cursor.req.height = height;
> +	atmel_hlcdc_crtc_cursor_prepare_req(crtc);
> +
> +	ret = atmel_hlcdc_crtc_cursor_apply_req(crtc);
> +	if (cma_gem)
> +		drm_gem_object_unreference_unlocked(&cma_gem->base);
> +
> +out:
> +	mutex_unlock(&crtc->cursor.lock);
> +
> +	return ret;
> +}
> +
> +static int atmel_hlcdc_crtc_cursor_move(struct drm_crtc *c, int x, int y)
> +{
> +	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
> +	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
> +	int ret;
> +
> +	if (unlikely(!plane))
> +		return -ENOTSUPP;
> +
> +	mutex_lock(&crtc->cursor.lock);
> +	/*
> +	 * If there's no cursor update pending, get the current
> +	 * cursor size and buffer.
> +	 */
> +	crtc->cursor.req = crtc->cursor.status;
> +
> +	crtc->cursor.req.x = x;
> +	crtc->cursor.req.y = y;
> +	atmel_hlcdc_crtc_cursor_prepare_req(crtc);
> +
> +	ret = atmel_hlcdc_crtc_cursor_apply_req(crtc);
> +	mutex_unlock(&crtc->cursor.lock);
> +
> +	return ret;
> +}
> +
> +static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
> +	.page_flip = atmel_hlcdc_crtc_page_flip,
> +	.set_config = drm_crtc_helper_set_config,
> +	.destroy = atmel_hlcdc_crtc_destroy,
> +};
> +
> +static const struct drm_crtc_funcs atmel_hlcdc_crtc_with_cursor_funcs = {
> +	.page_flip = atmel_hlcdc_crtc_page_flip,
> +	.set_config = drm_crtc_helper_set_config,
> +	.destroy = atmel_hlcdc_crtc_destroy,
> +	.cursor_set = atmel_hlcdc_crtc_cursor_set,
> +	.cursor_move = atmel_hlcdc_crtc_cursor_move,
> +};
> +
> +int atmel_hlcdc_crtc_create(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	struct atmel_hlcdc_planes *planes = dc->planes;
> +	const struct drm_crtc_funcs *funcs;
> +	struct atmel_hlcdc_crtc *crtc;
> +	int ret;
> +	int i;
> +
> +	crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
> +	if (!crtc) {
> +		dev_err(dev->dev, "allocation failed\n");
> +		return -ENOMEM;
> +	}
> +
> +	mutex_init(&crtc->cursor.lock);
> +	crtc->hlcdc = dc->hlcdc;
> +	crtc->cursor.plane = planes->cursor;
> +
> +	if (planes->cursor)
> +		funcs = &atmel_hlcdc_crtc_with_cursor_funcs;
> +	else
> +		funcs = &atmel_hlcdc_crtc_funcs;
> +
> +	ret = drm_crtc_init_with_planes(dev, &crtc->base,
> +				&planes->primary->base,
> +				planes->cursor ? &planes->cursor->base : NULL,
> +				funcs);
> +	if (ret < 0)
> +		goto fail;
> +
> +	atmel_hlcdc_layer_set_finished(&planes->primary->layer,
> +				       atmel_hlcdc_crtc_finish_page_flip,
> +				       crtc);
> +
> +	crtc->id = drm_crtc_index(&crtc->base);
> +
> +	if (planes->cursor)
> +		planes->cursor->base.possible_crtcs = 1 << crtc->id;
> +
> +	for (i = 0; i < planes->noverlays; i++)
> +		planes->overlays[i]->base.possible_crtcs = 1 << crtc->id;
> +
> +	drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
> +
> +	return 0;
> +
> +fail:
> +	atmel_hlcdc_crtc_destroy(&crtc->base);
> +	return ret;
> +}
> +
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> new file mode 100644
> index 0000000..e4ce24e
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -0,0 +1,477 @@
> +/*
> + * Copyright (C) 2014 Traphandler
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "atmel_hlcdc_dc.h"
> +
> +#define ATMEL_HLCDC_LAYER_IRQS_OFFSET		8
> +
> +static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
> +{
> +	struct drm_device *dev = data;
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	unsigned long status;
> +	unsigned int imr, isr;
> +	int bit;
> +
> +	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_IMR, &imr);
> +	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
> +	status = imr & isr;
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	bit = ATMEL_HLCDC_LAYER_IRQS_OFFSET;
> +	for_each_set_bit_from(bit, &status, ATMEL_HLCDC_LAYER_IRQS_OFFSET +
> +					    ATMEL_HLCDC_MAX_LAYERS) {
> +		int layerid = bit - ATMEL_HLCDC_LAYER_IRQS_OFFSET;
> +		struct atmel_hlcdc_layer *layer = dc->layers[layerid];
> +
> +		if (layer)
> +			atmel_hlcdc_layer_irq(layer);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static struct drm_framebuffer *atmel_hlcdc_fb_create(struct drm_device *dev,
> +		struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
> +{
> +	return drm_fb_cma_create(dev, file_priv, mode_cmd);
> +}
> +
> +static void atmel_hlcdc_fb_output_poll_changed(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +
> +	if (dc->fbdev)
> +		drm_fbdev_cma_hotplug_event(dc->fbdev);
> +}
> +
> +static const struct drm_mode_config_funcs mode_config_funcs = {
> +	.fb_create = atmel_hlcdc_fb_create,
> +	.output_poll_changed = atmel_hlcdc_fb_output_poll_changed,
> +};
> +
> +static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	struct atmel_hlcdc_planes *planes;
> +	int ret;
> +	int i;
> +
> +	drm_mode_config_init(dev);
> +
> +	ret = atmel_hlcdc_panel_create(dev);
> +	if (ret) {
> +		dev_err(dev->dev, "failed to create panel: %d\n", ret);
> +		return ret;
> +	}
> +
> +	planes = atmel_hlcdc_create_planes(dev);
> +	if (IS_ERR(planes)) {
> +		dev_err(dev->dev, "failed to create planes\n");
> +		return PTR_ERR(planes);
> +	}
> +
> +	dc->planes = planes;
> +
> +	dc->layers[planes->primary->layer.desc->id] =
> +						&planes->primary->layer;
> +
> +	if (planes->cursor)
> +		dc->layers[planes->cursor->layer.desc->id] =
> +							&planes->cursor->layer;
> +
> +	for (i = 0; i < planes->noverlays; i++)
> +		dc->layers[planes->overlays[i]->layer.desc->id] =
> +						&planes->overlays[i]->layer;
> +
> +	ret = atmel_hlcdc_crtc_create(dev);
> +	if (ret) {
> +		dev_err(dev->dev, "failed to create crtc\n");
> +		return ret;
> +	}
> +
> +	dev->mode_config.min_width = dc->desc->min_width;
> +	dev->mode_config.min_height = dc->desc->min_height;
> +	dev->mode_config.max_width = dc->desc->max_width;
> +	dev->mode_config.max_height = dc->desc->max_height;
> +	dev->mode_config.funcs = &mode_config_funcs;
> +
> +	return 0;
> +}
> +
> +static int atmel_hlcdc_dc_load(struct drm_device *dev, unsigned long flags)
> +{
> +	struct platform_device *pdev = dev->platformdev;
> +	const struct atmel_hlcdc_dc_desc *desc;
> +	struct atmel_hlcdc_dc *dc;
> +	int ret;
> +
> +	desc = platform_get_drvdata(pdev);
> +
> +	dc = devm_kzalloc(dev->dev, sizeof(*dc), GFP_KERNEL);
> +	if (!dc) {
> +		dev_err(dev->dev, "failed to allocate private data\n");
> +		return -ENOMEM;
> +	}
> +
> +	dc->desc = platform_get_drvdata(pdev);
> +	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
> +	dev->dev_private = dc;
> +
> +	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
> +	if (ret) {
> +		dev_err(dev->dev, "failed to enable periph_clk\n");
> +		return ret;
> +	}
> +
> +	pm_runtime_enable(dev->dev);
> +
> +	pm_runtime_put_sync(dev->dev);
> +
> +	ret = atmel_hlcdc_dc_modeset_init(dev);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "failed to initialize mode setting\n");
> +		goto err_periph_clk_disable;
> +	}
> +
> +	ret = drm_vblank_init(dev, 1);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "failed to initialize vblank\n");
> +		goto err_periph_clk_disable;
> +	}
> +
> +	pm_runtime_get_sync(dev->dev);
> +	ret = drm_irq_install(dev);
> +	pm_runtime_put_sync(dev->dev);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "failed to install IRQ handler\n");
> +		goto err_periph_clk_disable;
> +	}
> +
> +	platform_set_drvdata(pdev, dev);
> +
> +	drm_kms_helper_poll_init(dev);
> +
> +	dc->fbdev = drm_fbdev_cma_init(dev, 24,
> +			dev->mode_config.num_crtc,
> +			dev->mode_config.num_connector);
> +
> +	if (IS_ERR(dc->fbdev)) {
> +		ret = PTR_ERR(dc->fbdev);
> +		goto err_periph_clk_disable;
> +	}
> +
> +	return 0;
> +
> +err_periph_clk_disable:
> +	clk_disable_unprepare(dc->hlcdc->periph_clk);
> +
> +	return ret;
> +}
> +
> +static int atmel_hlcdc_dc_unload(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +
> +	drm_kms_helper_poll_fini(dev);
> +	drm_mode_config_cleanup(dev);
> +	drm_vblank_cleanup(dev);
> +
> +	pm_runtime_get_sync(dev->dev);
> +	drm_irq_uninstall(dev);
> +	pm_runtime_put_sync(dev->dev);
> +
> +	dev->dev_private = NULL;
> +
> +	pm_runtime_disable(dev->dev);
> +	clk_disable_unprepare(dc->hlcdc->periph_clk);
> +
> +	return 0;
> +}
> +
> +static void atmel_hlcdc_dc_preclose(struct drm_device *dev,
> +				    struct drm_file *file)
> +{
> +	struct drm_crtc *crtc;
> +
> +	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
> +		atmel_hlcdc_crtc_cancel_page_flip(crtc, file);
> +}
> +
> +static void atmel_hlcdc_dc_lastclose(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +
> +	drm_fbdev_cma_restore_mode(dc->fbdev);
> +}
> +
> +static void atmel_hlcdc_dc_irq_preinstall(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	unsigned int isr;
> +
> +	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
> +	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
> +}
> +
> +static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	int i;
> +
> +	/* Enable interrupts on activated layers */
> +	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
> +		if (dc->layers[i])
> +			regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER,
> +				     BIT(i + 8));
> +	}
> +
> +	return 0;
> +}
> +
> +static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
> +{
> +
> +}
> +
> +static int atmel_hlcdc_dc_enable_vblank(struct drm_device *dev, int crtc)
> +{
> +	return 0;
> +}
> +
> +static void atmel_hlcdc_dc_disable_vblank(struct drm_device *dev, int crtc)
> +{
> +}
> +
> +static const struct file_operations fops = {
> +	.owner              = THIS_MODULE,
> +	.open               = drm_open,
> +	.release            = drm_release,
> +	.unlocked_ioctl     = drm_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl       = drm_compat_ioctl,
> +#endif
> +	.poll               = drm_poll,
> +	.read               = drm_read,
> +	.llseek             = no_llseek,
> +	.mmap               = drm_gem_cma_mmap,
> +};
> +
> +static struct drm_driver atmel_hlcdc_dc_driver = {
> +	.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
> +	.load = atmel_hlcdc_dc_load,
> +	.unload = atmel_hlcdc_dc_unload,
> +	.preclose = atmel_hlcdc_dc_preclose,
> +	.lastclose = atmel_hlcdc_dc_lastclose,
> +	.irq_handler = atmel_hlcdc_dc_irq_handler,
> +	.irq_preinstall = atmel_hlcdc_dc_irq_preinstall,
> +	.irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
> +	.irq_uninstall = atmel_hlcdc_dc_irq_uninstall,
> +	.get_vblank_counter = drm_vblank_count,
> +	.enable_vblank = atmel_hlcdc_dc_enable_vblank,
> +	.disable_vblank = atmel_hlcdc_dc_disable_vblank,
> +	.gem_free_object = drm_gem_cma_free_object,
> +	.gem_vm_ops = &drm_gem_cma_vm_ops,
> +	.dumb_create = drm_gem_cma_dumb_create,
> +	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
> +	.dumb_destroy = drm_gem_dumb_destroy,
> +	.fops = &fops,
> +	.name = "atmel-hlcdc",
> +	.desc = "Atmel HLCD Controller DRM",
> +	.date = "20141504",
> +	.major = 1,
> +	.minor = 0,
> +};
> +
> +static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d3_layers[] = {
> +	{
> +		.name = "base",
> +		.formats = &atmel_hlcdc_plane_rgb_formats,
> +		.regs_offset = 0x40,
> +		.id = 0,
> +		.type = ATMEL_HLCDC_BASE_LAYER,
> +		.nconfigs = 7,
> +		.layout = {
> +			.xstride = { 2 },
> +			.default_color = 3,
> +			.general_config = 4,
> +			.disc_pos = 5,
> +			.disc_size = 6,
> +		},
> +	},
> +	{
> +		.name = "overlay1",
> +		.formats = &atmel_hlcdc_plane_rgb_formats,
> +		.regs_offset = 0x140,
> +		.id = 1,
> +		.type = ATMEL_HLCDC_OVERLAY_LAYER,
> +		.nconfigs = 10,
> +		.layout = {
> +			.pos = 2,
> +			.size = 3,
> +			.xstride = { 4 },
> +			.pstride = { 5 },
> +			.default_color = 6,
> +			.chroma_key = 7,
> +			.chroma_key_mask = 8,
> +			.general_config = 9,
> +		},
> +	},
> +	{
> +		.name = "overlay2",
> +		.formats = &atmel_hlcdc_plane_rgb_formats,
> +		.regs_offset = 0x240,
> +		.id = 2,
> +		.type = ATMEL_HLCDC_OVERLAY_LAYER,
> +		.nconfigs = 10,
> +		.layout = {
> +			.pos = 2,
> +			.size = 3,
> +			.xstride = { 4 },
> +			.pstride = { 5 },
> +			.default_color = 6,
> +			.chroma_key = 7,
> +			.chroma_key_mask = 8,
> +			.general_config = 9,
> +		},
> +	},
> +	{
> +		.name = "high-end-overlay",
> +		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
> +		.regs_offset = 0x340,
> +		.id = 3,
> +		.type = ATMEL_HLCDC_OVERLAY_LAYER,
> +		.nconfigs = 42,
> +		.layout = {
> +			.pos = 2,
> +			.size = 3,
> +			.memsize = 4,
> +			.xstride = { 5, 7 },
> +			.pstride = { 6, 8 },
> +			.default_color = 9,
> +			.chroma_key = 10,
> +			.chroma_key_mask = 11,
> +			.general_config = 12,
> +		},
> +	},
> +	{
> +		.name = "cursor",
> +		.formats = &atmel_hlcdc_plane_rgb_formats,
> +		.regs_offset = 0x440,
> +		.id = 4,
> +		.type = ATMEL_HLCDC_CURSOR_LAYER,
> +		.nconfigs = 10,
> +		.max_width = 128,
> +		.max_height = 128,
> +		.layout = {
> +			.pos = 2,
> +			.size = 3,
> +			.xstride = { 4 },
> +			.pstride = { 5 },
> +			.default_color = 6,
> +			.chroma_key = 7,
> +			.chroma_key_mask = 8,
> +			.general_config = 9,
> +		},
> +	},
> +};
> +
> +static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d3 = {
> +	.min_width = 0,
> +	.min_height = 0,
> +	.max_width = 2048,
> +	.max_height = 2048,
> +	.nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d3_layers),
> +	.layers = atmel_hlcdc_sama5d3_layers,
> +};
> +
> +static const struct of_device_id atmel_hlcdc_of_match[] = {
> +	{
> +		.compatible = "atmel,sama5d3-hlcdc",
> +		.data = &atmel_hlcdc_dc_sama5d3
> +	},
> +	{ /* sentinel */ },
> +};
> +
> +static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
> +{
> +	const struct of_device_id *match;
> +	int ret;
> +
> +	match = of_match_node(atmel_hlcdc_of_match, pdev->dev.parent->of_node);
> +	if (!match) {
> +		dev_err(&pdev->dev, "invalid compatible string\n");
> +		return -ENODEV;
> +	}
> +
> +	if (!match->data) {
> +		dev_err(&pdev->dev, "invalid hlcdc description\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, (void *)match->data);
> +
> +	ret = drm_platform_init(&atmel_hlcdc_dc_driver, pdev);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
> +{
> +	drm_put_dev(platform_get_drvdata(pdev));
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
> +	{ .compatible = "atmel,hlcdc-dc" },
> +	{ },
> +};
> +
> +static struct platform_driver atmel_hlcdc_dc_platform_driver = {
> +	.probe	= atmel_hlcdc_dc_drm_probe,
> +	.remove	= atmel_hlcdc_dc_drm_remove,
> +	.driver	= {
> +		.name	= "atmel-hlcdc-dc",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = atmel_hlcdc_dc_of_match,
> +	},
> +};
> +module_platform_driver(atmel_hlcdc_dc_platform_driver);
> +
> +MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@...phandler.com>");
> +MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@...e-electrons.com>");
> +MODULE_DESCRIPTION("Atmel HLCDC Display Controller DRM Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:atmel-hlcdc-dc");
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> new file mode 100644
> index 0000000..5d2919e
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
> @@ -0,0 +1,178 @@
> +/*
> + * Copyright (C) 2014 Traphandler
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef DRM_ATMEL_HLCDC_H
> +#define DRM_ATMEL_HLCDC_H
> +
> +#include <linux/clk.h>
> +#include <linux/irqdomain.h>
> +#include <linux/pwm.h>
> +
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drmP.h>
> +
> +#include "atmel_hlcdc_layer.h"
> +
> +#define ATMEL_HLCDC_MAX_LAYERS		5
> +
> +/**
> + * Atmel HLCDC Display Controller description structure.
> + *
> + * This structure describe the HLCDC IP capabilities and depends on the
> + * HLCDC IP version (or Atmel SoC family).
> + *
> + * @min_width: minimum width supported by the Display Controller
> + * @min_height: minimum height supported by the Display Controller
> + * @max_width: maximum width supported by the Display Controller
> + * @max_height: maximum height supported by the Display Controller
> + * @layer: a layer description table describing available layers
> + * @nlayers: layer description table size
> + */
> +struct atmel_hlcdc_dc_desc {
> +	int min_width;
> +	int min_height;
> +	int max_width;
> +	int max_height;
> +	const struct atmel_hlcdc_layer_desc *layers;
> +	int nlayers;
> +};
> +
> +/**
> + * Atmel HLCDC Plane properties.
> + *
> + * This structure stores plane property definitions.
> + *
> + * @alpha: alpha blending (or transparency) property
> + */
> +struct atmel_hlcdc_plane_properties {
> +	struct drm_property *alpha;
> +};
> +
> +/**
> + * Atmel HLCDC Plane.
> + *
> + * @base: base DRM plane structure
> + * @layer: HLCDC layer structure
> + * @properties: pointer to the property definitions structure
> + * @alpha: current alpha blending (or transparency) status
> + */
> +struct atmel_hlcdc_plane {
> +	struct drm_plane base;
> +	struct atmel_hlcdc_layer layer;
> +	struct atmel_hlcdc_plane_properties *properties;
> +	u8 alpha;
> +};
> +
> +static inline struct atmel_hlcdc_plane *
> +drm_plane_to_atmel_hlcdc_plane(struct drm_plane *p)
> +{
> +	return container_of(p, struct atmel_hlcdc_plane, base);
> +}
> +
> +static inline struct atmel_hlcdc_plane *
> +atmel_hlcdc_layer_to_plane(struct atmel_hlcdc_layer *l)
> +{
> +	return container_of(l, struct atmel_hlcdc_plane, layer);
> +}
> +
> +/**
> + * Atmel HLCDC Planes.
> + *
> + * This structure stores the instantiated HLCDC Planes and can be accessed by
> + * the HLCDC Display Controller or the HLCDC CRTC.
> + *
> + * @primary: primary plane
> + * @cursor: hardware cursor plane
> + * @overlays: overlay plane table
> + * @noverlays: number of overlay planes
> + */
> +struct atmel_hlcdc_planes {
> +	struct atmel_hlcdc_plane *primary;
> +	struct atmel_hlcdc_plane *cursor;
> +	struct atmel_hlcdc_plane **overlays;
> +	int noverlays;
> +};
> +
> +/**
> + * Atmel HLCDC Display Controller.
> + *
> + * @desc: HLCDC Display Controller description
> + * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
> + * @fbdev: framebuffer device attached to the Display Controller
> + * @planes: instantiated planes
> + * @layers: active HLCDC layer
> + */
> +struct atmel_hlcdc_dc {
> +	struct atmel_hlcdc_dc_desc *desc;
> +	struct atmel_hlcdc *hlcdc;
> +	struct drm_fbdev_cma *fbdev;
> +	struct atmel_hlcdc_planes *planes;
> +	struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
> +};
> +
> +extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
> +extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_and_yuv_formats;
> +
> +struct atmel_hlcdc_planes *
> +atmel_hlcdc_create_planes(struct drm_device *dev);
> +
> +int atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
> +				     u32 pixel_format,
> +				     struct drm_gem_cma_object **gems,
> +				     unsigned int *pitches,
> +				     unsigned int *offsets,
> +				     uint32_t src_x, uint32_t src_y,
> +				     uint32_t src_w, uint32_t src_h);
> +
> +void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> +					       u32 format);
> +
> +int atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
> +				    u32 format);
> +
> +int atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
> +					  struct drm_crtc *crtc,
> +					  int crtc_x, int crtc_y,
> +					  unsigned int crtc_w,
> +					  unsigned int crtc_h,
> +					  uint32_t src_x, uint32_t src_y,
> +					  uint32_t src_w, uint32_t src_h);
> +
> +void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *crtc,
> +				       struct drm_file *file);
> +
> +int atmel_hlcdc_crtc_create(struct drm_device *dev);
> +
> +int atmel_hlcdc_panel_create(struct drm_device *dev);
> +
> +struct atmel_hlcdc_pwm_chip *atmel_hlcdc_pwm_create(struct drm_device *dev,
> +						    struct clk *slow_clk,
> +						    struct clk *sys_clk,
> +						    void __iomem *regs);
> +
> +int atmel_hlcdc_pwm_destroy(struct drm_device *dev,
> +			    struct atmel_hlcdc_pwm_chip *chip);
> +
> +#endif /* DRM_ATMEL_HLCDC_H */
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
> new file mode 100644
> index 0000000..b449fe1
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
> @@ -0,0 +1,701 @@
> +/*
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +
> +#include "atmel_hlcdc_dc.h"
> +
> +static void
> +atmel_hlcdc_layer_gem_flip_release(struct atmel_hlcdc_layer *layer,
> +				   struct atmel_hlcdc_layer_gem_flip *flip)
> +{
> +	int i;
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (!flip->gems[i])
> +			break;
> +
> +		drm_gem_object_unreference_unlocked(flip->gems[i]);
> +	}
> +
> +	kfree(flip);
> +}
> +
> +static void atmel_hlcdc_layer_gc_work(struct work_struct *work)
> +{
> +	struct atmel_hlcdc_layer_gem_flip_gc *gc =
> +			container_of(work,
> +				     struct atmel_hlcdc_layer_gem_flip_gc,
> +				     work);
> +	struct atmel_hlcdc_layer *layer =
> +			container_of(gc , struct atmel_hlcdc_layer, gc);
> +
> +	while (true) {
> +		struct atmel_hlcdc_layer_gem_flip *flip;
> +		unsigned long flags;
> +
> +		spin_lock_irqsave(&gc->list_lock, flags);
> +		flip = list_first_entry_or_null(&gc->list,
> +					struct atmel_hlcdc_layer_gem_flip,
> +					node);
> +		if (flip)
> +			list_del(&flip->node);
> +		spin_unlock_irqrestore(&gc->list_lock, flags);
> +
> +		if (!flip)
> +			break;
> +
> +		atmel_hlcdc_layer_gem_flip_release(layer, flip);
> +
> +		mutex_lock(&gc->finished_lock);
> +		if (gc->finished)
> +			gc->finished(gc->finished_data);
> +		mutex_unlock(&gc->finished_lock);
> +	}
> +}
> +
> +static void
> +atmel_hlcdc_layer_gem_flip_put(struct atmel_hlcdc_layer *layer,
> +			       struct atmel_hlcdc_layer_gem_flip *flip)
> +{
> +	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
> +	unsigned long flags;
> +
> +	if (--flip->remaining_gems <= 0) {
> +		spin_lock_irqsave(&gc->list_lock, flags);
> +		list_add_tail(&flip->node,
> +			      &gc->list);
> +		spin_unlock_irqrestore(&gc->list_lock, flags);
> +		schedule_work(&gc->work);
> +	}
> +}
> +
> +static void atmel_hlcdc_layer_start_queue(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
> +	struct regmap *regmap = layer->hlcdc->regmap;
> +	int i;
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		dma->cur[i] = dma->queue[i];
> +		if (!dma->queue[i])
> +			continue;
> +		dma->queue[i] = NULL;
> +
> +		regmap_write(regmap,
> +			     desc->regs_offset +
> +			     ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
> +			     dma->cur[i]->addr);
> +		regmap_write(regmap,
> +			     desc->regs_offset +
> +			     ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
> +			     dma->cur[i]->ctrl);
> +		regmap_write(regmap,
> +			     desc->regs_offset +
> +			     ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
> +			     dma->cur[i]->next);
> +	}
> +}
> +
> +static void atmel_hlcdc_layer_update_apply(struct atmel_hlcdc_layer *layer)
> +{
> +	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct regmap *regmap = layer->hlcdc->regmap;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +	unsigned int cfg;
> +	u32 action = 0;
> +	int i;
> +
> +	if (upd->pending < 0 || upd->pending > 1)
> +		return;
> +
> +	slot = &upd->slots[upd->pending];
> +
> +	for_each_set_bit(cfg, slot->updated_configs, layer->desc->nconfigs) {
> +		regmap_write(regmap,
> +			     desc->regs_offset +
> +			     ATMEL_HLCDC_LAYER_CFG(layer, cfg),
> +			     slot->configs[cfg]);
> +		action |= ATMEL_HLCDC_LAYER_UPDATE;
> +	}
> +
> +	if (slot->gem_flip && slot->gem_flip->remaining_gems) {
> +		struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +
> +		for (i = 0; i < layer->max_planes; i++) {
> +			struct atmel_hlcdc_dma_channel_dscr *dscr;
> +
> +			if (!slot->gem_flip->gems[i])
> +				break;
> +
> +			dscr =  slot->dscrs[i];
> +			slot->dscrs[i] = NULL;
> +
> +			if (!dma->enabled) {
> +				action |= ATMEL_HLCDC_LAYER_DMA_CHAN;
> +				regmap_write(regmap,
> +					     desc->regs_offset +
> +					     ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
> +					     dscr->addr);
> +				regmap_write(regmap,
> +					     desc->regs_offset +
> +					     ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
> +					     dscr->ctrl);
> +				regmap_write(regmap,
> +					     desc->regs_offset +
> +					     ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
> +					     dscr->next);
> +				dma->cur[i] = dscr;
> +			} else {
> +				action |= ATMEL_HLCDC_LAYER_A2Q;
> +				regmap_write(regmap,
> +					     desc->regs_offset +
> +					     ATMEL_HLCDC_LAYER_PLANE_HEAD(i),
> +					     dscr->next);
> +				dma->queue[i] = dscr;
> +			}
> +		}
> +
> +		dma->enabled = true;
> +		slot->gem_flip = NULL;
> +	}
> +
> +	if (action)
> +		regmap_write(regmap,
> +			     desc->regs_offset + ATMEL_HLCDC_LAYER_CHER,
> +			     action);
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (!slot->dscrs[i])
> +			continue;
> +
> +		slot->dscrs[i]->gem_flip = NULL;
> +		slot->dscrs[i] = NULL;
> +	}
> +
> +	if (slot->gem_flip) {
> +		atmel_hlcdc_layer_gem_flip_put(layer, slot->gem_flip);
> +		slot->gem_flip = NULL;
> +	}
> +
> +	bitmap_clear(slot->updated_configs, 0, layer->desc->nconfigs);
> +	memset(slot->configs, 0,
> +	       sizeof(*slot->configs) * layer->desc->nconfigs);
> +
> +	upd->pending = -1;
> +}
> +
> +static bool
> +atmel_hlcdc_layer_dma_channel_active(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	int i;
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (dma->cur[i])
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +void atmel_hlcdc_layer_irq(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_gem_flip *flip_gc[ATMEL_HLCDC_MAX_PLANES];
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
> +	struct regmap *regmap = layer->hlcdc->regmap;
> +	struct atmel_hlcdc_dma_channel_dscr *dscr;
> +	unsigned long flags;
> +	unsigned int isr, imr;
> +	unsigned int status;
> +
> +	int i;
> +
> +	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IMR, &imr);
> +	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_ISR, &isr);
> +	status = imr & isr;
> +	if (!status)
> +		return;
> +
> +	memset(flip_gc, 0, sizeof(flip_gc));
> +
> +	spin_lock_irqsave(&dma->lock, flags);
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if ((status & ATMEL_HLCDC_LAYER_DONE_IRQ(i)) ||
> +		    (status & ATMEL_HLCDC_LAYER_ADD_IRQ(i))) {
> +			dscr = dma->cur[i];
> +			dma->cur[i] = NULL;
> +			flip_gc[i] = dscr->gem_flip;
> +			dscr->gem_flip = NULL;
> +		}
> +
> +		if (status & ATMEL_HLCDC_LAYER_ADD_IRQ(i)) {
> +			dma->cur[i] = dma->queue[i];
> +			dma->queue[i] = NULL;
> +		}
> +	}
> +
> +	/*
> +	 * The DMA channel might have been disabled before we were able to
> +	 * add the new frame to the DMA transfer queue.
> +	 * Try to re-enable the channel in this case.
> +	 */
> +	if (!atmel_hlcdc_layer_dma_channel_active(layer)) {
> +		if (atmel_hlcdc_layer_dma_channel_busy(layer)) {
> +			atmel_hlcdc_layer_start_queue(layer);
> +
> +			regmap_write(regmap,
> +				     desc->regs_offset +
> +				     ATMEL_HLCDC_LAYER_CHDR,
> +				     ATMEL_HLCDC_LAYER_A2Q);
> +			regmap_write(regmap,
> +				     desc->regs_offset +
> +				     ATMEL_HLCDC_LAYER_CHER,
> +				     ATMEL_HLCDC_LAYER_DMA_CHAN);
> +		} else {
> +			dma->enabled = false;
> +		}
> +	}
> +
> +	if (!atmel_hlcdc_layer_dma_channel_busy(layer)) {
> +		struct atmel_hlcdc_layer_update *upd = &layer->update;
> +
> +		spin_lock(&upd->pending_lock);
> +		atmel_hlcdc_layer_update_apply(layer);
> +		spin_unlock(&upd->pending_lock);
> +	}
> +	spin_unlock_irqrestore(&dma->lock, flags);
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (!flip_gc[i])
> +			break;
> +
> +		atmel_hlcdc_layer_gem_flip_put(layer, flip_gc[i]);
> +	}
> +}
> +
> +int atmel_hlcdc_layer_disable(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	unsigned long flags;
> +	int i;
> +
> +	spin_lock_irqsave(&dma->lock, flags);
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (!dma->cur[i])
> +			break;
> +
> +		dma->cur[i]->ctrl = 0;
> +	}
> +	spin_unlock_irqrestore(&dma->lock, flags);
> +
> +	return 0;
> +}
> +
> +void atmel_hlcdc_layer_set_finished(struct atmel_hlcdc_layer *layer,
> +				    void (*finished)(void *data),
> +				    void *data)
> +{
> +	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
> +
> +	mutex_lock(&gc->finished_lock);
> +	gc->finished = finished;
> +	gc->finished_data = data;
> +	mutex_unlock(&gc->finished_lock);
> +}
> +
> +static void atmel_hlcdc_layer_update_reset(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +	unsigned long flags;
> +	int i;
> +
> +	if (upd->next < 0 || upd->next > 1)
> +		return;
> +
> +	slot = &upd->slots[upd->next];
> +	bitmap_clear(slot->updated_configs, 0, layer->desc->nconfigs);
> +	memset(slot->configs, 0,
> +	       sizeof(*slot->configs) * layer->desc->nconfigs);
> +
> +	spin_lock_irqsave(&dma->lock, flags);
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (!slot->dscrs[i])
> +			break;
> +		slot->dscrs[i]->gem_flip = NULL;
> +		slot->dscrs[i] = NULL;
> +	}
> +	spin_unlock_irqrestore(&layer->dma.lock, flags);
> +
> +	if (slot->gem_flip) {
> +		atmel_hlcdc_layer_gem_flip_release(layer, slot->gem_flip);
> +		slot->gem_flip = NULL;
> +	}
> +
> +	upd->next = -1;
> +}
> +
> +int atmel_hlcdc_layer_update_start(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct regmap *regmap = layer->hlcdc->regmap;
> +	struct atmel_hlcdc_layer_gem_flip *gem_flip;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +	unsigned long flags;
> +	int i, j = 0;
> +	int pending;
> +
> +	gem_flip = kzalloc(sizeof(*gem_flip), GFP_KERNEL);
> +	if (!gem_flip)
> +		return -ENOMEM;
> +
> +	mutex_lock(&upd->lock);
> +
> +	spin_lock_irqsave(&upd->pending_lock, flags);
> +	pending = upd->pending;
> +	spin_unlock_irqrestore(&upd->pending_lock, flags);
> +
> +	upd->next = pending ? 0 : 1;
> +
> +	slot = &upd->slots[upd->next];
> +
> +	spin_lock_irqsave(&dma->lock, flags);
> +	for (i = 0; i < layer->max_planes * 4; i++) {
> +		if (!dma->dscrs[i].gem_flip) {
> +			slot->dscrs[j++] = &dma->dscrs[i];
> +			dma->dscrs[i].gem_flip = gem_flip;
> +			if (j == layer->max_planes)
> +				break;
> +		}
> +	}
> +
> +	if (j < layer->max_planes) {
> +		for (i = 0; i < j; i++)
> +			slot->dscrs[i]->gem_flip = NULL;
> +	}
> +	spin_unlock_irqrestore(&layer->dma.lock, flags);
> +
> +	if (j < layer->max_planes) {
> +		mutex_unlock(&upd->lock);
> +		kfree(gem_flip);
> +		return -EBUSY;
> +	}
> +
> +	slot->gem_flip = gem_flip;
> +
> +	spin_lock_irqsave(&upd->pending_lock, flags);
> +	pending = upd->pending;
> +	if (pending >= 0) {
> +		memcpy(upd->slots[upd->next].configs,
> +		       upd->slots[upd->pending].configs,
> +		       layer->desc->nconfigs * sizeof(u32));
> +		memcpy(upd->slots[upd->next].updated_configs,
> +		       upd->slots[upd->pending].updated_configs,
> +		       DIV_ROUND_UP(layer->desc->nconfigs,
> +				    BITS_PER_BYTE * sizeof(unsigned long)) *
> +		       sizeof(unsigned long));
> +	}
> +	spin_unlock_irqrestore(&upd->pending_lock, flags);
> +
> +	if (pending < 0)
> +		regmap_bulk_read(regmap, ATMEL_HLCDC_LAYER_CFG(layer, 0),
> +				 upd->slots[upd->next].configs,
> +				 layer->desc->nconfigs);
> +
> +	return 0;
> +}
> +
> +void atmel_hlcdc_layer_update_rollback(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +
> +	atmel_hlcdc_layer_update_reset(layer);
> +	mutex_unlock(&upd->lock);
> +}
> +
> +int atmel_hlcdc_layer_update_set_gem(struct atmel_hlcdc_layer *layer,
> +				     int plane_id,
> +				     struct drm_gem_cma_object *gem,
> +				     unsigned int offset)
> +{
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct atmel_hlcdc_layer_gem_flip *gem_flip;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +	struct atmel_hlcdc_dma_channel_dscr *dscr;
> +	struct drm_gem_object *old_gem;
> +
> +	if (upd->next < 0 || upd->next > 1)
> +		return -EINVAL;
> +
> +	if (plane_id >= layer->max_planes || plane_id < 0)
> +		return -EINVAL;
> +
> +	slot = &upd->slots[upd->next];
> +	dscr = slot->dscrs[plane_id];
> +	dscr->addr = gem->paddr + offset;
> +	dscr->ctrl = ATMEL_HLCDC_LAYER_DFETCH;
> +	gem_flip = dscr->gem_flip;
> +
> +	old_gem = gem_flip->gems[plane_id];
> +
> +	if (gem) {
> +		drm_gem_object_reference(&gem->base);
> +		gem_flip->gems[plane_id] = &gem->base;
> +		gem_flip->remaining_gems++;
> +	} else {
> +		gem_flip->gems[plane_id] = NULL;
> +	}
> +
> +	if (old_gem) {
> +		drm_gem_object_unreference_unlocked(old_gem);
> +		gem_flip->remaining_gems--;
> +	}
> +
> +	return 0;
> +}
> +
> +void atmel_hlcdc_layer_update_cfg(struct atmel_hlcdc_layer *layer, int cfg,
> +				  u32 mask, u32 val)
> +{
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +
> +	if (upd->next < 0 || upd->next > 1)
> +		return;
> +
> +	if (cfg >= layer->desc->nconfigs)
> +		return;
> +
> +	slot = &upd->slots[upd->next];
> +	slot->configs[cfg] &= ~mask;
> +	slot->configs[cfg] |= (val & mask);
> +	set_bit(cfg, slot->updated_configs);
> +}
> +
> +void atmel_hlcdc_layer_update_commit(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	struct atmel_hlcdc_layer_update_slot *slot;
> +	unsigned long flags;
> +	int pending;
> +
> +	if (upd->next < 0  || upd->next > 1)
> +		return;
> +
> +	slot = &upd->slots[upd->next];
> +
> +	spin_lock_irqsave(&upd->pending_lock, flags);
> +	pending = upd->pending;
> +	upd->pending = upd->next;
> +	upd->next = pending;
> +	if (pending >= 0 && !slot->gem_flip->remaining_gems) {
> +		struct atmel_hlcdc_layer_gem_flip *gem_flip = slot->gem_flip;
> +		struct atmel_hlcdc_dma_channel_dscr *dscrs[ATMEL_HLCDC_MAX_PLANES];
> +
> +		memcpy(dscrs, slot->dscrs, sizeof(dscrs));
> +		slot->gem_flip = upd->slots[pending].gem_flip;
> +		memcpy(slot->dscrs, upd->slots[pending].dscrs,
> +		       sizeof(slot->dscrs));
> +		upd->slots[pending].gem_flip = gem_flip;
> +		memcpy(upd->slots[pending].dscrs, dscrs, sizeof(dscrs));
> +	}
> +	spin_unlock_irqrestore(&upd->pending_lock, flags);
> +
> +	if (pending >= 0) {
> +		atmel_hlcdc_layer_update_reset(layer);
> +		mutex_unlock(&upd->lock);
> +		return;
> +	}
> +
> +	spin_lock_irqsave(&dma->lock, flags);
> +	if (!atmel_hlcdc_layer_dma_channel_busy(layer)) {
> +		spin_lock(&upd->pending_lock);
> +		atmel_hlcdc_layer_update_apply(layer);
> +		spin_unlock(&upd->pending_lock);
> +	}
> +	spin_unlock_irqrestore(&dma->lock, flags);
> +
> +	atmel_hlcdc_layer_update_reset(layer);
> +	mutex_unlock(&upd->lock);
> +}
> +
> +static int atmel_hlcdc_layer_dma_init(struct drm_device *dev,
> +				      struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	dma_addr_t dma_addr;
> +	int i;
> +
> +	dma->dscrs = dma_alloc_coherent(dev->dev,
> +					layer->max_planes * 4 *
> +					sizeof(*dma->dscrs),
> +					&dma_addr, GFP_KERNEL);
> +	if (!dma->dscrs)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < layer->max_planes * 4; i++) {
> +		struct atmel_hlcdc_dma_channel_dscr *dscr = &dma->dscrs[i];
> +
> +		dscr->next = dma_addr + (i * sizeof(*dscr));
> +	}
> +
> +	spin_lock_init(&dma->lock);
> +
> +	return 0;
> +}
> +
> +static void atmel_hlcdc_layer_dma_cleanup(struct drm_device *dev,
> +					  struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	int i;
> +
> +	for (i = 0; i < layer->max_planes * 4; i++) {
> +		struct atmel_hlcdc_dma_channel_dscr *dscr = &dma->dscrs[i];
> +
> +		if (!dscr->gem_flip)
> +			continue;
> +
> +		atmel_hlcdc_layer_gem_flip_put(layer, dscr->gem_flip);
> +	}
> +
> +	dma_free_coherent(dev->dev, layer->max_planes * 4 *
> +			  sizeof(*dma->dscrs), dma->dscrs,
> +			  dma->dscrs[0].next);
> +}
> +
> +static void atmel_hlcdc_layer_gc_init(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
> +
> +	INIT_LIST_HEAD(&gc->list);
> +	spin_lock_init(&gc->list_lock);
> +	INIT_WORK(&gc->work, atmel_hlcdc_layer_gc_work);
> +	mutex_init(&gc->finished_lock);
> +}
> +
> +static void atmel_hlcdc_layer_gc_cleanup(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
> +
> +	flush_work(&gc->work);
> +}
> +
> +static int atmel_hlcdc_layer_update_init(struct drm_device *dev,
> +				struct atmel_hlcdc_layer *layer,
> +				const struct atmel_hlcdc_layer_desc *desc)
> +{
> +	struct atmel_hlcdc_layer_update *upd = &layer->update;
> +	int updated_size;
> +	void *buffer;
> +	int i;
> +
> +	updated_size = DIV_ROUND_UP(desc->nconfigs,
> +				    BITS_PER_BYTE *
> +				    sizeof(unsigned long));
> +
> +	buffer = devm_kzalloc(dev->dev,
> +			      ((desc->nconfigs * sizeof(u32)) +
> +				(updated_size * sizeof(unsigned long))) * 2,
> +			      GFP_KERNEL);
> +	if (!buffer)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < 2; i++) {
> +		upd->slots[i].updated_configs = buffer;
> +		buffer += updated_size * sizeof(unsigned long);
> +		upd->slots[i].configs = buffer;
> +		buffer += desc->nconfigs * sizeof(u32);
> +	}
> +
> +	upd->pending = -1;
> +	upd->next = -1;
> +	spin_lock_init(&upd->pending_lock);
> +	mutex_init(&upd->lock);
> +
> +	return 0;
> +}
> +
> +int atmel_hlcdc_layer_init(struct drm_device *dev,
> +			   struct atmel_hlcdc_layer *layer,
> +			   const struct atmel_hlcdc_layer_desc *desc)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	struct regmap *regmap = dc->hlcdc->regmap;
> +	unsigned int tmp;
> +	int ret;
> +	int i;
> +
> +	layer->hlcdc = dc->hlcdc;
> +	layer->desc = desc;
> +
> +	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_CHDR,
> +		     ATMEL_HLCDC_LAYER_RST);
> +	for (i = 0; i < desc->formats->nformats; i++) {
> +		int nplanes = drm_format_num_planes(desc->formats->formats[i]);
> +
> +		if (nplanes > layer->max_planes)
> +			layer->max_planes = nplanes;
> +	}
> +
> +	atmel_hlcdc_layer_gc_init(layer);
> +	ret = atmel_hlcdc_layer_dma_init(dev, layer);
> +	if (ret)
> +		return ret;
> +
> +	ret = atmel_hlcdc_layer_update_init(dev, layer, desc);
> +	if (ret)
> +		return ret;
> +
> +	/* Flush Status Register */
> +	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IDR,
> +		     0xffffffff);
> +	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_ISR,
> +		    &tmp);
> +
> +	for (i = 0; i < layer->max_planes; i++)
> +		regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IER,
> +			     ATMEL_HLCDC_LAYER_ADD_IRQ(i) |
> +			     ATMEL_HLCDC_LAYER_DONE_IRQ(i));
> +
> +	return 0;
> +}
> +
> +void atmel_hlcdc_layer_cleanup(struct drm_device *dev,
> +			       struct atmel_hlcdc_layer *layer)
> +{
> +	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
> +	struct regmap *regmap = layer->hlcdc->regmap;
> +
> +	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IDR,
> +		     0xffffffff);
> +	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_CHDR,
> +		     ATMEL_HLCDC_LAYER_RST);
> +
> +	atmel_hlcdc_layer_dma_cleanup(dev, layer);
> +	atmel_hlcdc_layer_gc_cleanup(layer);
> +}
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
> new file mode 100644
> index 0000000..868f444
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
> @@ -0,0 +1,417 @@
> +/*
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef DRM_ATMEL_HLCDC_LAYER_H
> +#define DRM_ATMEL_HLCDC_LAYER_H
> +
> +#include <linux/mfd/atmel-hlcdc.h>
> +
> +#include <drm/drm_crtc.h>
> +#include <drm/drmP.h>
> +
> +#define ATMEL_HLCDC_LAYER_CHER			0x0
> +#define ATMEL_HLCDC_LAYER_CHDR			0x4
> +#define ATMEL_HLCDC_LAYER_CHSR			0x8
> +#define		ATMEL_HLCDC_LAYER_DMA_CHAN	BIT(0)
> +#define		ATMEL_HLCDC_LAYER_UPDATE	BIT(1)
> +#define		ATMEL_HLCDC_LAYER_A2Q		BIT(2)
> +#define		ATMEL_HLCDC_LAYER_RST		BIT(8)
> +
> +#define ATMEL_HLCDC_LAYER_IER			0xc
> +#define ATMEL_HLCDC_LAYER_IDR			0x10
> +#define ATMEL_HLCDC_LAYER_IMR			0x14
> +#define ATMEL_HLCDC_LAYER_ISR			0x18
> +#define		ATMEL_HLCDC_LAYER_DFETCH	BIT(0)
> +#define		ATMEL_HLCDC_LAYER_LFETCH	BIT(1)
> +#define		ATMEL_HLCDC_LAYER_DMA_IRQ(n)	BIT(2 + ((n) * 8))
> +#define		ATMEL_HLCDC_LAYER_DSCR_IRQ(n)	BIT(3 + ((n) * 8))
> +#define		ATMEL_HLCDC_LAYER_ADD_IRQ(n)	BIT(4 + ((n) * 8))
> +#define		ATMEL_HLCDC_LAYER_DONE_IRQ(n)	BIT(5 + ((n) * 8))
> +#define		ATMEL_HLCDC_LAYER_OVR_IRQ(n)	BIT(6 + ((n) * 8))
> +
> +#define ATMEL_HLCDC_LAYER_PLANE_HEAD(n)		(((n) * 0x10) + 0x1c)
> +#define ATMEL_HLCDC_LAYER_PLANE_ADDR(n)		(((n) * 0x10) + 0x20)
> +#define ATMEL_HLCDC_LAYER_PLANE_CTRL(n)		(((n) * 0x10) + 0x24)
> +#define ATMEL_HLCDC_LAYER_PLANE_NEXT(n)		(((n) * 0x10) + 0x28)
> +#define ATMEL_HLCDC_LAYER_CFG(p, c)		(((c) * 4) + ((p)->max_planes * 0x10) + 0x1c)
> +
> +#define	ATMEL_HLCDC_LAYER_DMA_CFG_ID		0
> +#define	ATMEL_HLCDC_LAYER_DMA_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, ATMEL_HLCDC_LAYER_DMA_CFG_ID)
> +
> +#define	ATMEL_HLCDC_LAYER_FORMAT_CFG_ID		1
> +#define	ATMEL_HLCDC_LAYER_FORMAT_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, ATMEL_HLCDC_LAYER_FORMAT_CFG_ID)
> +#define		ATMEL_HLCDC_LAYER_RGB		(0 << 0)
> +#define		ATMEL_HLCDC_LAYER_CLUT		(1 << 0)
> +#define		ATMEL_HLCDC_LAYER_YUV		(2 << 0)
> +#define		ATMEL_HLCDC_RGB_MODE(m)		(((m) & 0xf) << 4)
> +#define		ATMEL_HLCDC_CLUT_MODE(m)	(((m) & 0x3) << 8)
> +#define		ATMEL_HLCDC_YUV_MODE(m)		(((m) & 0xf) << 12)
> +#define		ATMEL_HLCDC_YUV422ROT		(1 << 16)
> +#define		ATMEL_HLCDC_YUV422SWP		(1 << 17)
> +#define		ATMEL_HLCDC_DSCALEOPT		(1 << 20)
> +
> +#define		ATMEL_HLCDC_XRGB4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(0))
> +#define		ATMEL_HLCDC_ARGB4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(1))
> +#define		ATMEL_HLCDC_RGBA4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(2))
> +#define		ATMEL_HLCDC_RGB565_MODE		(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(3))
> +#define		ATMEL_HLCDC_ARGB1555_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(4))
> +#define		ATMEL_HLCDC_XRGB8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(9))
> +#define		ATMEL_HLCDC_RGB888_MODE		(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(10))
> +#define		ATMEL_HLCDC_ARGB8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(12))
> +#define		ATMEL_HLCDC_RGBA8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(13))
> +
> +#define		ATMEL_HLCDC_AYUV_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(0))
> +#define		ATMEL_HLCDC_YUYV_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(1))
> +#define		ATMEL_HLCDC_UYVY_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(2))
> +#define		ATMEL_HLCDC_YVYU_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(3))
> +#define		ATMEL_HLCDC_VYUY_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(4))
> +#define		ATMEL_HLCDC_NV61_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(5))
> +#define		ATMEL_HLCDC_YUV422_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(6))
> +#define		ATMEL_HLCDC_NV21_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(7))
> +#define		ATMEL_HLCDC_YUV420_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(8))
> +
> +#define	ATMEL_HLCDC_LAYER_POS_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.pos)
> +#define	ATMEL_HLCDC_LAYER_SIZE_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.size)
> +#define	ATMEL_HLCDC_LAYER_MEMSIZE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.memsize)
> +#define	ATMEL_HLCDC_LAYER_XSTRIDE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.xstride)
> +#define	ATMEL_HLCDC_LAYER_PSTRIDE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.pstride)
> +#define ATMEL_HLCDC_LAYER_DFLTCOLOR_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.default_color)
> +#define ATMEL_HLCDC_LAYER_CRKEY_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.chroma_key)
> +#define ATMEL_HLCDC_LAYER_CRKEY_MASK_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.chroma_key_mask)
> +
> +#define	ATMEL_HLCDC_LAYER_GENERAL_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.general_config)
> +#define		ATMEL_HLCDC_LAYER_CRKEY		BIT(0)
> +#define		ATMEL_HLCDC_LAYER_INV		BIT(1)
> +#define		ATMEL_HLCDC_LAYER_ITER2BL	BIT(2)
> +#define		ATMEL_HLCDC_LAYER_ITER		BIT(3)
> +#define		ATMEL_HLCDC_LAYER_REVALPHA	BIT(4)
> +#define		ATMEL_HLCDC_LAYER_GAEN		BIT(5)
> +#define		ATMEL_HLCDC_LAYER_LAEN		BIT(6)
> +#define		ATMEL_HLCDC_LAYER_OVR		BIT(7)
> +#define		ATMEL_HLCDC_LAYER_DMA		BIT(8)
> +#define		ATMEL_HLCDC_LAYER_REP		BIT(9)
> +#define		ATMEL_HLCDC_LAYER_DSTKEY	BIT(10)
> +#define		ATMEL_HLCDC_LAYER_GA_MASK	GENMASK(23, 16)
> +#define		ATMEL_HLCDC_LAYER_GA_SHIFT	16
> +
> +#define ATMEL_HLCDC_LAYER_DISC_POS_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.disc_pos)
> +
> +#define ATMEL_HLCDC_LAYER_DISC_SIZE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.disc_size)
> +
> +#define ATMEL_HLCDC_MAX_PLANES			3
> +
> +/**
> + * Atmel HLCDC Layer registers layout structure
> + *
> + * Each HLCDC layer has its own register organization and a given register
> + * by be placed differently on 2 different layers depending on its
> + * capabilities.
> + * This structure stores common registers layout for a given layer and is
> + * used by HLCDC layer code to chose the appropriate register to write to
> + * or to read from.
> + *
> + * For all fields, a value of zero means "unsupported".
> + *
> + * See Atmel's datasheet for a detailled description of these registers.
> + *
> + * @xstride: xstride registers
> + * @pstride: pstride registers
> + * @pos: position register
> + * @size: displayed size register
> + * @memsize: memory size register
> + * @default_color: default color register
> + * @chroma_key: chroma key register
> + * @chroma_key_mask: chroma key mask register
> + * @general_config: general layer config register
> + * @disc_pos: discard area position register
> + * @disc_size: discard area size register
> + * @color_space_conv: color spave conversion register
> + */
> +struct atmel_hlcdc_layer_cfg_layout {
> +	int xstride[ATMEL_HLCDC_MAX_PLANES];
> +	int pstride[ATMEL_HLCDC_MAX_PLANES];
> +	int pos;
> +	int size;
> +	int memsize;
> +	int default_color;
> +	int chroma_key;
> +	int chroma_key_mask;
> +	int general_config;
> +	int disc_pos;
> +	int disc_size;
> +	int color_space_conv;
> +};
> +
> +/**
> + * Atmel HLCDC GEM flip structure
> + *
> + * This structure is allocated when someone asked for a layer update (most
> + * likely a DRM plane update, either primary, overlay or cursor plane) and
> + * released when the layer do not need the reference GEM objects anymore
> + * (i.e. the layer was disabled or updated).
> + *
> + * @node: list element structure. Used to attach the GEM flip structure to
> + *	  the garbage collector when the layer no longer need the referenced
> + *	  GEM objects.
> + * @gems: the referenced GEM objects. The number of GEM object referenced
> + *	  depends on the chosen format.
> + * @remaining_gems: the number of GEM object still referenced by the layer.
> + *		    When no more objects are referenced the GEM flip structure
> + *		    is added to the garbage collector.
> + */
> +struct atmel_hlcdc_layer_gem_flip {
> +	struct list_head node;
> +	struct drm_gem_object *gems[ATMEL_HLCDC_MAX_PLANES];
> +	int remaining_gems;
> +};
> +
> +/**
> + * Atmel HLCDC DMA descriptor structure
> + *
> + * This structure is used by the HLCDC DMA engine to schedule a DMA transfer.
> + *
> + * The structure fields must remain in this specific order, because they're
> + * used by the HLCDC DMA engine, which expect them in this order.
> + *
> + * @addr: buffer DMA address
> + * @ctrl: DMA transfer options
> + * @next: next DMA descriptor to fetch
> + * @gem_flip: the attached gem_flip operation
> + */
> +struct atmel_hlcdc_dma_channel_dscr {
> +	dma_addr_t addr;
> +	u32 ctrl;
> +	dma_addr_t next;
> +	struct atmel_hlcdc_layer_gem_flip *gem_flip;
> +} __aligned(sizeof(u64));
> +
> +/**
> + * Atmel HLCDC layer types
> + */
> +enum atmel_hlcdc_layer_type {
> +	ATMEL_HLCDC_BASE_LAYER,
> +	ATMEL_HLCDC_OVERLAY_LAYER,
> +	ATMEL_HLCDC_CURSOR_LAYER,
> +	ATMEL_HLCDC_PP_LAYER,
> +};
> +
> +/**
> + * Atmel HLCDC Supported formats structure
> + *
> + * This structure list all the formats supported by a given layer.
> + *
> + * @nformats: number of supported formats
> + * @formats: supported formats
> + */
> +struct atmel_hlcdc_formats {
> +	int nformats;
> +	uint32_t *formats;
> +};
> +
> +/**
> + * Atmel HLCDC Layer description structure
> + *
> + * This structure describe the capabilities provided by a given layer.
> + *
> + * @name: layer name
> + * @type: layer type
> + * @id: layer id
> + * @regs_offset: offset of the layer registers from the HLCDC registers base
> + * @nconfigs: number of config registers provided by this layer
> + * @layout: config registers layout
> + * @max_width: maximum width supported by this layer (0 means unlimited)
> + * @max_height: maximum height supported by this layer (0 means unlimited)
> + */
> +struct atmel_hlcdc_layer_desc {
> +	const char *name;
> +	enum atmel_hlcdc_layer_type type;
> +	int id;
> +	int regs_offset;
> +	int nconfigs;
> +	struct atmel_hlcdc_formats *formats;
> +	struct atmel_hlcdc_layer_cfg_layout layout;
> +	int max_width;
> +	int max_height;
> +};
> +
> +/**
> + * Atmel HLCDC Layer Update Slot structure
> + *
> + * This structure stores layer update requests to be applied on next frame.
> + * This is the base structure behind the atomic layer update infrastructure.
> + *
> + * Atomic layer update provides a way to update all layer's parameters
> + * simultaneously. This is needed to avoid incompatible sequential updates
> + * like this one:
> + * 1) update layer format from RGB888 (1 plane/buffer) to YUV422
> + *    (2 planes/buffers)
> + * 2) the format update is applied but the DMA channel for the second
> + *    plane/buffer is not enabled
> + * 3) enable the DMA channel for the second plane
> + *
> + *@...rs: DMA channel descriptors
> + *@..._flip: gem_flip object
> + *@...ated_configs: bitmask used to record modified configs
> + *@...figs: new config values
> + */
> +struct atmel_hlcdc_layer_update_slot {
> +	struct atmel_hlcdc_dma_channel_dscr *dscrs[ATMEL_HLCDC_MAX_PLANES];
> +	struct atmel_hlcdc_layer_gem_flip *gem_flip;
> +	unsigned long *updated_configs;
> +	u32 *configs;
> +};
> +
> +/**
> + * Atmel HLCDC Layer Update structure
> + *
> + * This structure provides a way to queue layer update requests.
> + *
> + * At a given time there is at most:
> + *  - one pending update request, which means the update request has been
> + *    commited (or validated) and is waiting for the DMA channel(s) to be
> + *    available
> + *  - one request being prepared, which means someone started a layer update
> + *    but has not commited it yet. There cannot be more than one started
> + *    request, because the update lock is taken when starting a layer update
> + *    and release when commiting or rolling back the request.
> + *
> + *@...ts: update slots. One is used for pending request and the other one
> + *	  for started update request
> + *@...ding: the pending slot index or -1 if no request is pending
> + *@...t: the started update slot index or -1 no update has been started
> + *@...ding_lock: lock to access the pending field
> + *@...k: layer update lock
> + */
> +struct atmel_hlcdc_layer_update {
> +	struct atmel_hlcdc_layer_update_slot slots[2];
> +	int pending;
> +	int next;
> +	spinlock_t pending_lock;
> +	struct mutex lock;
> +};
> +
> +/**
> + * Atmel HLCDC Layer GEM flip garbage collector structure
> + *
> + * This structure is used to schedule GEM object release when we are in
> + * interrupt context (within atmel_hlcdc_layer_irq function).
> + *
> + *@...t: GEM flip objects to release
> + *@...t_lock: lock to access the GEM flip list
> + *@...k: work queue scheduled when there are GEM flip to collect
> + *@...ished: action to execute the GEM flip and all attached objects have been
> + *	     released
> + *@...ished_data: data passed to the finished callback
> + *@...ished_lock: lock to access finished related fields
> + */
> +struct atmel_hlcdc_layer_gem_flip_gc {
> +	struct list_head list;
> +	spinlock_t list_lock;
> +	struct work_struct work;
> +	void (*finished)(void *data);
> +	void *finished_data;
> +	struct mutex finished_lock;
> +};
> +
> +/**
> + * Atmel HLCDC Layer DMA channel structure
> + *
> + * This structure stores informations on the DMA channel associated to a
> + * given layer.
> + *
> + *@...bled: DMA channel status
> + *@...k: lock to access the DMA channel fields
> + *@cur: current DMA transfers (one for each plane/buffer)
> + *@...ue: next DMA transfers, to be launch on next frame update
> + *@...rs: allocated DMA descriptors
> + */
> +struct atmel_hlcdc_layer_dma_channel {
> +	bool enabled;
> +	spinlock_t lock;
> +	struct atmel_hlcdc_dma_channel_dscr *cur[ATMEL_HLCDC_MAX_PLANES];
> +	struct atmel_hlcdc_dma_channel_dscr *queue[ATMEL_HLCDC_MAX_PLANES];
> +	struct atmel_hlcdc_dma_channel_dscr *dscrs;
> +};
> +
> +/**
> + * Atmel HLCDC Layer structure
> + *
> + * This structure stores information on the layer instance.
> + *
> + *@...c: layer description
> + *@..._planes: maximum planes/buffers that can be associated with this layer.
> + *	       This depends on the supported formats.
> + *@...dc: pointer to the atmel_hlcdc structure provided by the MFD device
> + *@dma: dma channel
> + *@gc: GEM flip garbage collector
> + *@...ate: update handler
> + */
> +struct atmel_hlcdc_layer {
> +	const struct atmel_hlcdc_layer_desc *desc;
> +	int max_planes;
> +	struct atmel_hlcdc *hlcdc;
> +	struct atmel_hlcdc_layer_dma_channel dma;
> +	struct atmel_hlcdc_layer_gem_flip_gc gc;
> +	struct atmel_hlcdc_layer_update update;
> +};
> +
> +void atmel_hlcdc_layer_irq(struct atmel_hlcdc_layer *layer);
> +
> +int atmel_hlcdc_layer_init(struct drm_device *dev,
> +			   struct atmel_hlcdc_layer *layer,
> +			   const struct atmel_hlcdc_layer_desc *desc);
> +
> +void atmel_hlcdc_layer_cleanup(struct drm_device *dev,
> +			       struct atmel_hlcdc_layer *layer);
> +
> +int atmel_hlcdc_layer_disable(struct atmel_hlcdc_layer *layer);
> +
> +void atmel_hlcdc_layer_set_finished(struct atmel_hlcdc_layer *layer,
> +				    void (*finished)(void *data),
> +				    void *data);
> +
> +int atmel_hlcdc_layer_update_start(struct atmel_hlcdc_layer *layer);
> +
> +void atmel_hlcdc_layer_update_cfg(struct atmel_hlcdc_layer *layer, int cfg,
> +				  u32 mask, u32 val);
> +
> +int atmel_hlcdc_layer_update_set_gem(struct atmel_hlcdc_layer *layer,
> +				     int plane_id,
> +				     struct drm_gem_cma_object *gem,
> +				     unsigned int offset);
> +
> +void atmel_hlcdc_layer_update_rollback(struct atmel_hlcdc_layer *layer);
> +
> +void atmel_hlcdc_layer_update_commit(struct atmel_hlcdc_layer *layer);
> +
> +static inline bool
> +atmel_hlcdc_layer_dma_channel_busy(struct atmel_hlcdc_layer *layer)
> +{
> +	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
> +	int i;
> +
> +	for (i = 0; i < layer->max_planes; i++) {
> +		if (dma->queue[i])
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +#endif /* DRM_ATMEL_HLCDC_LAYER_H */
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
> new file mode 100644
> index 0000000..3295021
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
> @@ -0,0 +1,351 @@
> +/*
> + * Copyright (C) 2014 Traphandler
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_panel.h>
> +
> +#include "atmel_hlcdc_dc.h"
> +
> +/**
> + * Atmel HLCDC RGB output mode
> + */
> +enum atmel_hlcdc_connector_rgb_mode {
> +	ATMEL_HLCDC_CONNECTOR_RGB444,
> +	ATMEL_HLCDC_CONNECTOR_RGB565,
> +	ATMEL_HLCDC_CONNECTOR_RGB666,
> +	ATMEL_HLCDC_CONNECTOR_RGB888,
> +};
> +
> +/**
> + * Atmel HLCDC Panel structure
> + *
> + * This structure stores informations about an DRM panel connected through
> + * the RGB connector.
> + *
> + * @mode: RGB output mode
> + * @connector: DRM connector
> + * @encoder: DRM encoder
> + * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
> + * @panel: pointer to the attached DRM panel
> + * @pinctrl: pinctrl state used by the current RGB output mode
> + * @np: DRM panel DT node
> + * @dpms: current DPMS mode
> + */
> +struct atmel_hlcdc_panel {
> +	enum atmel_hlcdc_connector_rgb_mode mode;
> +	struct drm_connector connector;
> +	struct drm_encoder encoder;
> +	struct atmel_hlcdc *hlcdc;
> +	struct drm_panel *panel;
> +	struct pinctrl *pinctrl;
> +	struct device_node *np;
> +	int dpms;
> +};
> +
> +static const char * const pin_state_names[] = {
> +	[ATMEL_HLCDC_CONNECTOR_RGB444] = "rgb-444",
> +	[ATMEL_HLCDC_CONNECTOR_RGB565] = "rgb-565",
> +	[ATMEL_HLCDC_CONNECTOR_RGB666] = "rgb-666",
> +	[ATMEL_HLCDC_CONNECTOR_RGB888] = "rgb-888",
> +};
> +
> +static inline struct atmel_hlcdc_panel *
> +drm_connector_to_atmel_hlcdc_panel(struct drm_connector *connector)
> +{
> +	return container_of(connector, struct atmel_hlcdc_panel, connector);
> +}
> +
> +static inline struct atmel_hlcdc_panel *
> +drm_encoder_to_atmel_hlcdc_panel(struct drm_encoder *encoder)
> +{
> +	return container_of(encoder, struct atmel_hlcdc_panel, encoder);
> +}
> +
> +static void atmel_hlcdc_panel_encoder_dpms(struct drm_encoder *encoder,
> +					   int mode)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_encoder_to_atmel_hlcdc_panel(encoder);
> +	struct regmap *regmap = panel->hlcdc->regmap;
> +	unsigned int status;
> +
> +	if (mode != DRM_MODE_DPMS_ON)
> +		mode = DRM_MODE_DPMS_OFF;
> +
> +	if (mode == panel->dpms)
> +		return;
> +
> +	if (mode != DRM_MODE_DPMS_ON) {
> +		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       (status & ATMEL_HLCDC_DISP))
> +			cpu_relax();
> +
> +		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       (status & ATMEL_HLCDC_SYNC))
> +			cpu_relax();
> +
> +		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       (status & ATMEL_HLCDC_PIXEL_CLK))
> +			cpu_relax();
> +
> +		clk_disable_unprepare(panel->hlcdc->sys_clk);
> +		if (panel->panel)
> +			drm_panel_disable(panel->panel);
> +	} else {
> +		if (panel->panel)
> +			drm_panel_enable(panel->panel);
> +		clk_prepare_enable(panel->hlcdc->sys_clk);
> +
> +		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       !(status & ATMEL_HLCDC_PIXEL_CLK))
> +			cpu_relax();
> +
> +
> +		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       !(status & ATMEL_HLCDC_SYNC))
> +			cpu_relax();
> +
> +		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
> +		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
> +		       !(status & ATMEL_HLCDC_DISP))
> +			cpu_relax();
> +	}
> +
> +	panel->dpms = mode;
> +}
> +
> +static bool
> +atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
> +				     const struct drm_display_mode *mode,
> +				     struct drm_display_mode *adjusted)
> +{
> +	return true;
> +}
> +
> +static void atmel_hlcdc_panel_encoder_prepare(struct drm_encoder *encoder)
> +{
> +	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
> +}
> +
> +static void atmel_hlcdc_panel_encoder_commit(struct drm_encoder *encoder)
> +{
> +	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
> +}
> +
> +static void
> +atmel_hlcdc_panel_encoder_mode_set(struct drm_encoder *encoder,
> +				   struct drm_display_mode *mode,
> +				   struct drm_display_mode *adjusted)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_encoder_to_atmel_hlcdc_panel(encoder);
> +	unsigned long prate = clk_get_rate(panel->hlcdc->sys_clk);
> +	unsigned long mode_rate = mode->clock * 1000;
> +	int div;
> +	u32 cfg0 = 0;
> +
> +	if ((prate / 2) < mode_rate) {
> +		prate *= 2;
> +		cfg0 |= ATMEL_HLCDC_CLKSEL;
> +	}
> +
> +	div = DIV_ROUND_UP(prate, mode_rate);
> +	if (div < 2)
> +		div = 2;
> +
> +	cfg0 |= ATMEL_HLCDC_CLKDIV(div);
> +
> +	regmap_update_bits(panel->hlcdc->regmap, ATMEL_HLCDC_CFG(0),
> +			   ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK, cfg0);
> +}
> +
> +static struct drm_encoder_helper_funcs encoder_helper_funcs = {
> +	.dpms = atmel_hlcdc_panel_encoder_dpms,
> +	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
> +	.prepare = atmel_hlcdc_panel_encoder_prepare,
> +	.commit = atmel_hlcdc_panel_encoder_commit,
> +	.mode_set = atmel_hlcdc_panel_encoder_mode_set,
> +};
> +
> +static void atmel_hlcdc_panel_encoder_destroy(struct drm_encoder *encoder)
> +{
> +	drm_encoder_cleanup(encoder);
> +	memset(encoder, 0, sizeof(*encoder));
> +}
> +
> +static const struct drm_encoder_funcs encoder_funcs = {
> +	.destroy = atmel_hlcdc_panel_encoder_destroy,
> +};
> +
> +static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_connector_to_atmel_hlcdc_panel(connector);
> +	int ret;
> +
> +	if (!panel->panel)
> +		return -ENOENT;
> +
> +	ret = panel->panel->funcs->get_modes(panel->panel);
> +	return ret;
> +}
> +
> +static int atmel_hlcdc_panel_mode_valid(struct drm_connector *connector,
> +					struct drm_display_mode *mode)
> +{
> +	return MODE_OK;
> +}
> +
> +static struct drm_encoder *
> +atmel_hlcdc_panel_best_encoder(struct drm_connector *connector)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_connector_to_atmel_hlcdc_panel(connector);
> +
> +	return &panel->encoder;
> +}
> +
> +static struct drm_connector_helper_funcs connector_helper_funcs = {
> +	.get_modes = atmel_hlcdc_panel_get_modes,
> +	.mode_valid = atmel_hlcdc_panel_mode_valid,
> +	.best_encoder = atmel_hlcdc_panel_best_encoder,
> +};
> +
> +static enum drm_connector_status
> +atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_connector_to_atmel_hlcdc_panel(connector);
> +
> +	if (!panel->panel) {
> +		panel->panel = of_drm_find_panel(panel->np);
> +		if (panel->panel)
> +			drm_panel_attach(panel->panel, &panel->connector);
> +	}
> +
> +	if (panel->panel)
> +		return connector_status_connected;
> +
> +	return connector_status_disconnected;
> +}
> +
> +static void
> +atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
> +{
> +	struct atmel_hlcdc_panel *panel =
> +			drm_connector_to_atmel_hlcdc_panel(connector);
> +
> +	if (panel->panel)
> +		drm_panel_detach(panel->panel);
> +
> +	drm_sysfs_connector_remove(connector);
> +	drm_connector_cleanup(connector);
> +
> +	pinctrl_put(panel->pinctrl);
> +}
> +
> +static const struct drm_connector_funcs connector_funcs = {
> +	.dpms = drm_helper_connector_dpms,
> +	.detect = atmel_hlcdc_panel_connector_detect,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = atmel_hlcdc_panel_connector_destroy,
> +};
> +
> +int atmel_hlcdc_panel_create(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	struct atmel_hlcdc_panel *panel;
> +	struct of_phandle_args out_args;
> +	u32 cfg;
> +	int ret;
> +
> +	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
> +	if (!panel)
> +		return -ENOMEM;
> +
> +	ret = of_parse_phandle_with_fixed_args(dev->dev->of_node,
> +					       "atmel,panel", 2, 0,
> +					       &out_args);
> +	if (ret) {
> +		dev_err(dev->dev, "failed to retrieve panel info from DT\n");
> +		return ret;
> +	}
> +
> +	switch (out_args.args[0]) {
> +	case ATMEL_HLCDC_CONNECTOR_RGB444:
> +	case ATMEL_HLCDC_CONNECTOR_RGB565:
> +	case ATMEL_HLCDC_CONNECTOR_RGB666:
> +	case ATMEL_HLCDC_CONNECTOR_RGB888:
> +		break;
> +	default:
> +		dev_err(dev->dev, "unknown RGB mode\n");
> +		return -EINVAL;
> +	}
> +
> +	panel->np = out_args.np;
> +	panel->mode = out_args.args[0];
> +	panel->pinctrl = pinctrl_get_select(dev->dev,
> +					    pin_state_names[panel->mode]);
> +	if (IS_ERR(panel->pinctrl)) {
> +		dev_err(dev->dev, "could not request pinctrl state\n");
> +		return PTR_ERR(panel->pinctrl);
> +	}
> +
> +	cfg = out_args.args[1] & (ATMEL_HLCDC_HSPOL |
> +				  ATMEL_HLCDC_VSPOL |
> +				  ATMEL_HLCDC_VSPDLYS |
> +				  ATMEL_HLCDC_VSPDLYE |
> +				  ATMEL_HLCDC_DISPPOL |
> +				  ATMEL_HLCDC_DISPDLY |
> +				  ATMEL_HLCDC_VSPSU |
> +				  ATMEL_HLCDC_VSPHO);
> +	cfg |= panel->mode << 8;
> +
> +	regmap_write(dc->hlcdc->regmap,
> +		     ATMEL_HLCDC_CFG(5),
> +		     cfg);
> +
> +	panel->dpms = DRM_MODE_DPMS_OFF;
> +
> +	panel->hlcdc = dc->hlcdc;
> +
> +	drm_connector_init(dev, &panel->connector, &connector_funcs,
> +			   DRM_MODE_CONNECTOR_LVDS);
> +	drm_connector_helper_add(&panel->connector, &connector_helper_funcs);
> +	panel->connector.dpms = DRM_MODE_DPMS_OFF;
> +	panel->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
> +
> +	drm_encoder_init(dev, &panel->encoder, &encoder_funcs,
> +			 DRM_MODE_ENCODER_LVDS);
> +	drm_encoder_helper_add(&panel->encoder, &encoder_helper_funcs);
> +
> +	drm_mode_connector_attach_encoder(&panel->connector, &panel->encoder);
> +	drm_sysfs_connector_add(&panel->connector);
> +
> +	panel->encoder.possible_crtcs = 0x1;
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> new file mode 100644
> index 0000000..f428b47
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -0,0 +1,658 @@
> +/*
> + * Copyright (C) 2014 Free Electrons
> + * Copyright (C) 2014 Atmel
> + *
> + * Author: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "atmel_hlcdc_dc.h"
> +
> +#define SUBPIXEL_MASK			0xffff
> +
> +static uint32_t rgb_formats[] = {
> +	DRM_FORMAT_XRGB4444,
> +	DRM_FORMAT_ARGB4444,
> +	DRM_FORMAT_RGBA4444,
> +	DRM_FORMAT_ARGB1555,
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_ARGB1555,
> +	DRM_FORMAT_XRGB8888,
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_RGBA8888,
> +};
> +
> +struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats = {
> +	.formats = rgb_formats,
> +	.nformats = ARRAY_SIZE(rgb_formats),
> +};
> +
> +static uint32_t rgb_and_yuv_formats[] = {
> +	DRM_FORMAT_XRGB4444,
> +	DRM_FORMAT_ARGB4444,
> +	DRM_FORMAT_RGBA4444,
> +	DRM_FORMAT_ARGB1555,
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_ARGB1555,
> +	DRM_FORMAT_XRGB8888,
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_RGBA8888,
> +	DRM_FORMAT_AYUV,
> +	DRM_FORMAT_YUYV,
> +	DRM_FORMAT_UYVY,
> +	DRM_FORMAT_YVYU,
> +	DRM_FORMAT_VYUY,
> +	DRM_FORMAT_NV61,
> +	DRM_FORMAT_YUV422,
> +	DRM_FORMAT_NV21,
> +};
> +
> +struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_and_yuv_formats = {
> +	.formats = rgb_and_yuv_formats,
> +	.nformats = ARRAY_SIZE(rgb_and_yuv_formats),
> +};
> +
> +static int atmel_hlcdc_format_to_plane_mode(u32 format, u32 *mode)
> +{
> +	switch (format) {
> +	case DRM_FORMAT_XRGB4444:
> +		*mode = ATMEL_HLCDC_XRGB4444_MODE;
> +		break;
> +	case DRM_FORMAT_ARGB4444:
> +		*mode = ATMEL_HLCDC_ARGB4444_MODE;
> +		break;
> +	case DRM_FORMAT_RGBA4444:
> +		*mode = ATMEL_HLCDC_RGBA4444_MODE;
> +		break;
> +	case DRM_FORMAT_RGB565:
> +		*mode = ATMEL_HLCDC_RGB565_MODE;
> +		break;
> +	case DRM_FORMAT_RGB888:
> +		*mode = ATMEL_HLCDC_RGB888_MODE;
> +		break;
> +	case DRM_FORMAT_ARGB1555:
> +		*mode = ATMEL_HLCDC_ARGB1555_MODE;
> +		break;
> +	case DRM_FORMAT_XRGB8888:
> +		*mode = ATMEL_HLCDC_XRGB8888_MODE;
> +		break;
> +	case DRM_FORMAT_ARGB8888:
> +		*mode = ATMEL_HLCDC_ARGB8888_MODE;
> +		break;
> +	case DRM_FORMAT_RGBA8888:
> +		*mode = ATMEL_HLCDC_RGBA8888_MODE;
> +		break;
> +	case DRM_FORMAT_AYUV:
> +		*mode = ATMEL_HLCDC_AYUV_MODE;
> +		break;
> +	case DRM_FORMAT_YUYV:
> +		*mode = ATMEL_HLCDC_YUYV_MODE;
> +		break;
> +	case DRM_FORMAT_UYVY:
> +		*mode = ATMEL_HLCDC_UYVY_MODE;
> +		break;
> +	case DRM_FORMAT_YVYU:
> +		*mode = ATMEL_HLCDC_YVYU_MODE;
> +		break;
> +	case DRM_FORMAT_VYUY:
> +		*mode = ATMEL_HLCDC_VYUY_MODE;
> +		break;
> +	case DRM_FORMAT_NV61:
> +		*mode = ATMEL_HLCDC_NV61_MODE;
> +		break;
> +	case DRM_FORMAT_YUV422:
> +		*mode = ATMEL_HLCDC_YUV422_MODE;
> +		break;
> +	case DRM_FORMAT_NV21:
> +		*mode = ATMEL_HLCDC_NV21_MODE;
> +		break;
> +	case DRM_FORMAT_YUV420:
> +		*mode = ATMEL_HLCDC_YUV420_MODE;
> +		break;
> +	default:
> +		return -ENOTSUPP;
> +	}
> +
> +	return 0;
> +}
> +
> +static bool atmel_hlcdc_format_embedds_alpha(u32 format)
> +{
> +	int i;
> +
> +	for (i = 0; i < sizeof(format); i++) {
> +		char tmp = (format >> (8 * i)) & 0xff;
> +
> +		if (tmp == 'A')
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +static u32 heo_downscaling_xcoef[] = {
> +	0x11343311,
> +	0x000000f7,
> +	0x1635300c,
> +	0x000000f9,
> +	0x1b362c08,
> +	0x000000fb,
> +	0x1f372804,
> +	0x000000fe,
> +	0x24382400,
> +	0x00000000,
> +	0x28371ffe,
> +	0x00000004,
> +	0x2c361bfb,
> +	0x00000008,
> +	0x303516f9,
> +	0x0000000c,
> +};
> +
> +static u32 heo_downscaling_ycoef[] = {
> +	0x00123737,
> +	0x00173732,
> +	0x001b382d,
> +	0x001f3928,
> +	0x00243824,
> +	0x0028391f,
> +	0x002d381b,
> +	0x00323717,
> +};
> +
> +static u32 heo_upscaling_xcoef[] = {
> +	0xf74949f7,
> +	0x00000000,
> +	0xf55f33fb,
> +	0x000000fe,
> +	0xf5701efe,
> +	0x000000ff,
> +	0xf87c0dff,
> +	0x00000000,
> +	0x00800000,
> +	0x00000000,
> +	0x0d7cf800,
> +	0x000000ff,
> +	0x1e70f5ff,
> +	0x000000fe,
> +	0x335ff5fe,
> +	0x000000fb,
> +};
> +
> +static u32 heo_upscaling_ycoef[] = {
> +	0x00004040,
> +	0x00075920,
> +	0x00056f0c,
> +	0x00027b03,
> +	0x00008000,
> +	0x00037b02,
> +	0x000c6f05,
> +	0x00205907,
> +};
> +
> +int atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
> +					  struct drm_crtc *crtc,
> +					  int crtc_x, int crtc_y,
> +					  unsigned int crtc_w,
> +					  unsigned int crtc_h,
> +					  uint32_t src_x, uint32_t src_y,
> +					  uint32_t src_w, uint32_t src_h)
> +{
> +	const struct atmel_hlcdc_layer_cfg_layout *layout =
> +						&plane->layer.desc->layout;
> +
> +	if (!crtc_h || !crtc_w)
> +		return -EINVAL;
> +
> +	if (!layout->pos && (crtc_x || crtc_y))
> +		return -EINVAL;
> +
> +	if ((crtc_x + crtc_w) > crtc->mode.crtc_hdisplay ||
> +	    (crtc_y + crtc_h) > crtc->mode.crtc_vdisplay)
> +		return -EINVAL;
> +
> +	if (!layout->size &&
> +	    (crtc->mode.crtc_hdisplay != crtc_w ||
> +	     crtc->mode.crtc_vdisplay != crtc_h))
> +		return -EINVAL;
> +
> +	if (plane->layer.desc->max_height &&
> +	    crtc_h > plane->layer.desc->max_height)
> +		return -EINVAL;
> +
> +	if (plane->layer.desc->max_width &&
> +	    crtc_w > plane->layer.desc->max_width)
> +		return -EINVAL;
> +
> +	if (!layout->memsize && (crtc_h != src_h || crtc_w != src_w))
> +		return -EINVAL;
> +
> +	if (layout->size)
> +		atmel_hlcdc_layer_update_cfg(&plane->layer,
> +					     layout->size,
> +					     0xffffffff,
> +					     (crtc_w - 1) |
> +					     ((crtc_h - 1) << 16));
> +
> +	if (layout->memsize)
> +		atmel_hlcdc_layer_update_cfg(&plane->layer,
> +					     layout->memsize,
> +					     0xffffffff,
> +					     (src_w - 1) |
> +					     ((src_h - 1) << 16));
> +
> +	if (layout->pos)
> +		atmel_hlcdc_layer_update_cfg(&plane->layer,
> +					     layout->pos,
> +					     0xffffffff,
> +					     crtc_x | (crtc_y  << 16));
> +
> +	/* TODO: rework the rescaling part */
> +	if (crtc_w != src_w || crtc_h != src_h) {
> +		u32 factor_reg = 0;
> +
> +		if (crtc_w != src_w) {
> +			int i;
> +			u32 factor;
> +			u32 *coeff_tab = heo_upscaling_xcoef;
> +			u32 max_memsize;
> +
> +			if (crtc_w < src_w)
> +				coeff_tab = heo_downscaling_xcoef;
> +			for (i = 0; i < ARRAY_SIZE(heo_upscaling_xcoef); i++)
> +				atmel_hlcdc_layer_update_cfg(&plane->layer,
> +							     17 + i,
> +							     0xffffffff,
> +							     coeff_tab[i]);
> +			factor = ((8 * 256 * src_w) - (256 * 4)) / crtc_w;
> +			factor++;
> +			max_memsize = ((factor * crtc_w) + (256 * 4)) / 2048;
> +			if (max_memsize > src_w)
> +				factor--;
> +			factor_reg |= factor | 0x80000000;
> +		}
> +
> +		if (crtc_h != src_h) {
> +			int i;
> +			u32 factor;
> +			u32 *coeff_tab = heo_upscaling_ycoef;
> +			u32 max_memsize;
> +
> +			if (crtc_w < src_w)
> +				coeff_tab = heo_downscaling_ycoef;
> +			for (i = 0; i < ARRAY_SIZE(heo_upscaling_ycoef); i++)
> +				atmel_hlcdc_layer_update_cfg(&plane->layer,
> +							     33 + i,
> +							     0xffffffff,
> +							     coeff_tab[i]);
> +			factor = ((8 * 256 * src_w) - (256 * 4)) / crtc_w;
> +			factor++;
> +			max_memsize = ((factor * crtc_w) + (256 * 4)) / 2048;
> +			if (max_memsize > src_w)
> +				factor--;
> +			factor_reg |= (factor << 16) | 0x80000000;
> +		}
> +
> +		atmel_hlcdc_layer_update_cfg(&plane->layer, 13, 0xffffffff,
> +					     factor_reg);
> +	}
> +
> +	return 0;
> +}
> +
> +void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
> +					       u32 format)
> +{
> +	const struct atmel_hlcdc_layer_cfg_layout *layout =
> +						&plane->layer.desc->layout;
> +	unsigned int cfg = ATMEL_HLCDC_LAYER_DMA;
> +
> +	if (plane->base.type != DRM_PLANE_TYPE_PRIMARY) {
> +		cfg |= ATMEL_HLCDC_LAYER_OVR | ATMEL_HLCDC_LAYER_ITER2BL |
> +		       ATMEL_HLCDC_LAYER_ITER;
> +
> +		if (atmel_hlcdc_format_embedds_alpha(format))
> +			cfg |= ATMEL_HLCDC_LAYER_LAEN;
> +		else
> +			cfg |= (plane->alpha << ATMEL_HLCDC_LAYER_GA_SHIFT) |
> +			       ATMEL_HLCDC_LAYER_GAEN;
> +	}
> +
> +	atmel_hlcdc_layer_update_cfg(&plane->layer, layout->general_config,
> +				     ATMEL_HLCDC_LAYER_ITER2BL |
> +				     ATMEL_HLCDC_LAYER_ITER |
> +				     ATMEL_HLCDC_LAYER_GAEN |
> +				     ATMEL_HLCDC_LAYER_LAEN |
> +				     ATMEL_HLCDC_LAYER_OVR |
> +				     ATMEL_HLCDC_LAYER_DMA |
> +				     ATMEL_HLCDC_LAYER_GA_MASK, cfg);
> +}
> +
> +int atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
> +				    u32 format)
> +{
> +	u32 mode;
> +	int ret;
> +
> +	ret = atmel_hlcdc_format_to_plane_mode(format, &mode);
> +	if (ret)
> +		return ret;
> +
> +	atmel_hlcdc_layer_update_cfg(&plane->layer,
> +				     ATMEL_HLCDC_LAYER_FORMAT_CFG_ID,
> +				     0xffffffff,
> +				     mode);
> +
> +	return 0;
> +}
> +
> +int atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
> +				     u32 pixel_format,
> +				     struct drm_gem_cma_object **gems,
> +				     unsigned int *pitches,
> +				     unsigned int *offsets,
> +				     uint32_t src_x, uint32_t src_y,
> +				     uint32_t src_w, uint32_t src_h)
> +{
> +	struct atmel_hlcdc_layer *layer = &plane->layer;
> +	const struct atmel_hlcdc_layer_cfg_layout *layout =
> +							&layer->desc->layout;
> +	int bpp[ATMEL_HLCDC_MAX_PLANES];
> +	int nplanes;
> +	int ret = 0;
> +	int i;
> +
> +	nplanes = drm_format_num_planes(pixel_format);
> +
> +	for (i = 0; i < nplanes; i++) {
> +		bpp[i] = drm_format_plane_cpp(pixel_format, i);
> +		if (!bpp[i])
> +			return -EINVAL;
> +
> +		if (!gems[i])
> +			return -EINVAL;
> +	}
> +
> +	for (i = 0; i < nplanes; i++) {
> +		int offset;
> +
> +		offset = offsets[i] + (src_y * pitches[i]) +
> +			 (src_x * bpp[i]);
> +
> +		ret = atmel_hlcdc_layer_update_set_gem(&plane->layer, i,
> +						       gems[i], offset);
> +		if (ret)
> +			return ret;
> +
> +		if (layout->xstride[i])
> +			atmel_hlcdc_layer_update_cfg(&plane->layer,
> +						layout->xstride[i],
> +						0xffffffff,
> +						pitches[i] - (bpp[i] * src_w));
> +	}
> +
> +	return 0;
> +}
> +
> +static int atmel_hlcdc_plane_update(struct drm_plane *p,
> +				    struct drm_crtc *crtc,
> +				    struct drm_framebuffer *fb,
> +				    int crtc_x, int crtc_y,
> +				    unsigned int crtc_w, unsigned int crtc_h,
> +				    uint32_t src_x, uint32_t src_y,
> +				    uint32_t src_w, uint32_t src_h)
> +{
> +	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> +	struct drm_gem_cma_object *gems[ATMEL_HLCDC_MAX_PLANES];
> +	int nplanes;
> +	int ret = 0;
> +	int i;
> +
> +	/* Subpixel positioning is not supported */
> +	if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
> +		DRM_DEBUG_KMS("Primary base does not support subpixel positioning\n");
> +		return -EINVAL;
> +	}
> +
> +	src_h >>= 16;
> +	src_w >>= 16;
> +	src_x >>= 16;
> +	src_y >>= 16;
> +
> +	nplanes = drm_format_num_planes(fb->pixel_format);
> +	if (nplanes > ATMEL_HLCDC_MAX_PLANES)
> +		return -EINVAL;
> +
> +	for (i = 0; i < nplanes; i++)
> +		gems[i] = drm_fb_cma_get_gem_obj(fb, i);
> +
> +	atmel_hlcdc_layer_update_start(&plane->layer);
> +	ret = atmel_hlcdc_plane_update_pos_and_size(plane, crtc,
> +						    crtc_x, crtc_y,
> +						    crtc_w, crtc_h,
> +						    src_x, src_y,
> +						    src_w, src_h);
> +	if (ret)
> +		goto out;
> +
> +	atmel_hlcdc_plane_update_general_settings(plane, fb->pixel_format);
> +
> +	ret = atmel_hlcdc_plane_update_format(plane, fb->pixel_format);
> +	if (ret)
> +		goto out;
> +
> +
> +	ret = atmel_hlcdc_plane_update_buffers(plane, fb->pixel_format,
> +					       gems,
> +					       fb->pitches, fb->offsets,
> +					       src_x, src_y,
> +					       src_w, src_h);
> +
> +	if (ret)
> +		goto out;
> +
> +	atmel_hlcdc_layer_update_commit(&plane->layer);
> +
> +	drm_framebuffer_reference(fb);
> +	if (plane->base.fb)
> +		drm_framebuffer_unreference(plane->base.fb);
> +	plane->base.fb = fb;
> +
> +	return 0;
> +
> +out:
> +	atmel_hlcdc_layer_update_rollback(&plane->layer);
> +
> +	return ret;
> +}
> +
> +static int atmel_hlcdc_plane_disable(struct drm_plane *p)
> +{
> +	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> +
> +	return atmel_hlcdc_layer_disable(&plane->layer);
> +}
> +
> +static void atmel_hlcdc_plane_destroy(struct drm_plane *p)
> +{
> +	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> +
> +	if (plane->base.fb)
> +		drm_framebuffer_unreference(plane->base.fb);
> +
> +	atmel_hlcdc_layer_cleanup(p->dev, &plane->layer);
> +
> +	drm_plane_cleanup(p);
> +	devm_kfree(p->dev->dev, plane);
> +}
> +
> +static int atmel_hlcdc_plane_set_alpha(struct atmel_hlcdc_plane *plane,
> +				       u8 alpha)
> +{
> +	atmel_hlcdc_layer_update_start(&plane->layer);
> +	plane->alpha = alpha;
> +	atmel_hlcdc_plane_update_general_settings(plane,
> +						plane->base.fb->pixel_format);
> +	atmel_hlcdc_layer_update_commit(&plane->layer);
> +
> +	return 0;
> +}
> +
> +static int atmel_hlcdc_plane_set_property(struct drm_plane *p,
> +					  struct drm_property *property,
> +					  uint64_t value)
> +{
> +	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
> +	struct atmel_hlcdc_plane_properties *props = plane->properties;
> +
> +	if (property == props->alpha)
> +		atmel_hlcdc_plane_set_alpha(plane, value);
> +	else
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static struct drm_plane_funcs layer_plane_funcs = {
> +	.update_plane = atmel_hlcdc_plane_update,
> +	.disable_plane = atmel_hlcdc_plane_disable,
> +	.set_property = atmel_hlcdc_plane_set_property,
> +	.destroy = atmel_hlcdc_plane_destroy,
> +};
> +
> +static struct atmel_hlcdc_plane *
> +atmel_hlcdc_plane_create(struct drm_device *dev,
> +			 const struct atmel_hlcdc_layer_desc *desc)
> +{
> +	struct atmel_hlcdc_plane *plane;
> +	enum drm_plane_type type;
> +	int ret;
> +
> +	plane = devm_kzalloc(dev->dev, sizeof(*plane), GFP_KERNEL);
> +	if (!plane)
> +		return ERR_PTR(-ENOMEM);
> +
> +	ret = atmel_hlcdc_layer_init(dev, &plane->layer, desc);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	/* Set default property values*/
> +	plane->alpha = 0xff;
> +
> +	if (desc->type == ATMEL_HLCDC_BASE_LAYER)
> +		type = DRM_PLANE_TYPE_PRIMARY;
> +	else if (desc->type == ATMEL_HLCDC_CURSOR_LAYER)
> +		type = DRM_PLANE_TYPE_CURSOR;
> +	else
> +		type = DRM_PLANE_TYPE_OVERLAY;
> +
> +	ret = drm_universal_plane_init(dev, &plane->base, 0,
> +				       &layer_plane_funcs,
> +				       desc->formats->formats,
> +				       desc->formats->nformats, type);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	return plane;
> +}
> +
> +static struct atmel_hlcdc_plane_properties *
> +atmel_hlcdc_plane_create_properties(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_plane_properties *props;
> +
> +	props = devm_kzalloc(dev->dev, sizeof(*props), GFP_KERNEL);
> +	if (!props)
> +		return ERR_PTR(-ENOMEM);
> +
> +	props->alpha = drm_property_create_range(dev, 0, "alpha", 0, 255);
> +	if (!props->alpha)
> +		return ERR_PTR(-ENOMEM);
> +
> +	return props;
> +}
> +
> +struct atmel_hlcdc_planes *
> +atmel_hlcdc_create_planes(struct drm_device *dev)
> +{
> +	struct atmel_hlcdc_dc *dc = dev->dev_private;
> +	struct atmel_hlcdc_plane_properties *props;
> +	struct atmel_hlcdc_planes *planes;
> +	const struct atmel_hlcdc_layer_desc *descs = dc->desc->layers;
> +	int nlayers = dc->desc->nlayers;
> +	int i;
> +
> +	planes = devm_kzalloc(dev->dev, sizeof(*planes), GFP_KERNEL);
> +	if (!planes)
> +		return ERR_PTR(-ENOMEM);
> +
> +	for (i = 0; i < nlayers; i++) {
> +		if (descs[i].type == ATMEL_HLCDC_OVERLAY_LAYER)
> +			planes->noverlays++;
> +	}
> +
> +	if (planes->noverlays) {
> +		planes->overlays = devm_kzalloc(dev->dev,
> +						planes->noverlays *
> +						sizeof(*planes->overlays),
> +						GFP_KERNEL);
> +		if (!planes->overlays)
> +			return ERR_PTR(-ENOMEM);
> +	}
> +
> +	props = atmel_hlcdc_plane_create_properties(dev);
> +	if (IS_ERR(props))
> +		return ERR_CAST(props);
> +
> +	planes->noverlays = 0;
> +	for (i = 0; i < nlayers; i++) {
> +		struct atmel_hlcdc_plane *plane;
> +
> +		if (descs[i].type == ATMEL_HLCDC_PP_LAYER)
> +			continue;
> +
> +		plane = atmel_hlcdc_plane_create(dev, &descs[i]);
> +		if (IS_ERR(plane))
> +			return ERR_CAST(plane);
> +
> +		plane->properties = props;
> +
> +		switch (descs[i].type) {
> +		case ATMEL_HLCDC_BASE_LAYER:
> +			if (planes->primary)
> +				return ERR_PTR(-EINVAL);
> +			planes->primary = plane;
> +			break;
> +
> +		case ATMEL_HLCDC_OVERLAY_LAYER:
> +			planes->overlays[planes->noverlays++] = plane;
> +			drm_object_attach_property(&plane->base.base,
> +						   props->alpha, 255);
> +			break;
> +
> +		case ATMEL_HLCDC_CURSOR_LAYER:
> +			if (planes->cursor)
> +				return ERR_PTR(-EINVAL);
> +			planes->cursor = plane;
> +			drm_object_attach_property(&plane->base.base,
> +						   props->alpha, 255);
> +			break;
> +
> +		default:
> +			break;
> +		}
> +	}
> +
> +	return planes;
> +}
> diff --git a/drivers/gpu/drm/atmel_hlcdc/Kconfig b/drivers/gpu/drm/atmel_hlcdc/Kconfig
> new file mode 100644
> index 0000000..59c8eeb
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel_hlcdc/Kconfig
> @@ -0,0 +1,11 @@
> +config DRM_ATMEL_HLCDC
> +	tristate "DRM Support for ATMEL HLCDC Display Controller"
> +	depends on DRM && OF && ARM && COMMON_CLK
> +	select DRM_GEM_CMA_HELPER
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_FB_HELPER
> +	select DRM_KMS_CMA_HELPER
> +	select DRM_PANEL
> +	help
> +	  Choose this option if you have an ATMEL SoC with an HLCDC display
> +	  controller (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family).
> diff --git a/drivers/gpu/drm/atmel_hlcdc/Makefile b/drivers/gpu/drm/atmel_hlcdc/Makefile
> new file mode 100644
> index 0000000..08de8d7
> --- /dev/null
> +++ b/drivers/gpu/drm/atmel_hlcdc/Makefile
> @@ -0,0 +1,8 @@
> +atmel_hlcdc-y := atmel_hlcdc_crtc.o \
> +		atmel_hlcdc_drv.o \
> +		atmel_hlcdc_layer.o \
> +		atmel_hlcdc_panel.o \
> +		atmel_hlcdc_plane.o \
> +		atmel_hlcdc_pwm.o
> +
> +obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel_hlcdc.o
> 
--
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