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Date: Fri, 15 Mar 2019 11:53:42 +0100
From: Daniel Vetter <daniel@...ll.ch>
To: Paul Cercueil <paul@...pouillou.net>
Cc: Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Sean Paul <sean@...rly.run>, dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] DRM: Add KMS driver for the Ingenic JZ47xx SoCs
On Thu, Mar 14, 2019 at 01:36:59PM +0100, Paul Cercueil wrote:
> Hi Daniel,
>
> Le ven. 1 mars 2019 à 9:26, Daniel Vetter <daniel@...ll.ch> a écrit :
> > On Thu, Feb 28, 2019 at 07:07:56PM -0300, Paul Cercueil wrote:
> > > Add a KMS driver for the Ingenic JZ47xx family of SoCs.
> > > This driver is meant to replace the aging jz4740-fb driver.
> > >
> > > Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> > > Tested-by: Artur Rojek <contact@...ur-rojek.eu>
> >
> > Yay, more fbdev drivers moving to atmic!
> >
> > Going on vacations for a week now, so just a few quick high-level
> > comments
> > below. Those should make the driver even smaller and cleaner.
> >
> > > ---
> > > drivers/gpu/drm/Kconfig | 2 +
> > > drivers/gpu/drm/Makefile | 1 +
> > > drivers/gpu/drm/ingenic/Kconfig | 16 +
> > > drivers/gpu/drm/ingenic/Makefile | 1 +
> > > drivers/gpu/drm/ingenic/ingenic-drm.c | 896
> > > ++++++++++++++++++++++++++++++++++
> > > 5 files changed, 916 insertions(+)
> > > create mode 100644 drivers/gpu/drm/ingenic/Kconfig
> > > create mode 100644 drivers/gpu/drm/ingenic/Makefile
> > > create mode 100644 drivers/gpu/drm/ingenic/ingenic-drm.c
> > >
> > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > > index bd943a71756c..f1929112e559 100644
> > > --- a/drivers/gpu/drm/Kconfig
> > > +++ b/drivers/gpu/drm/Kconfig
> > > @@ -303,6 +303,8 @@ source "drivers/gpu/drm/sti/Kconfig"
> > >
> > > source "drivers/gpu/drm/imx/Kconfig"
> > >
> > > +source "drivers/gpu/drm/ingenic/Kconfig"
> > > +
> > > source "drivers/gpu/drm/v3d/Kconfig"
> > >
> > > source "drivers/gpu/drm/vc4/Kconfig"
> > > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > > index 1ac55c65eac0..9666c0767f44 100644
> > > --- a/drivers/gpu/drm/Makefile
> > > +++ b/drivers/gpu/drm/Makefile
> > > @@ -94,6 +94,7 @@ obj-$(CONFIG_DRM_TEGRA) += tegra/
> > > obj-$(CONFIG_DRM_STM) += stm/
> > > obj-$(CONFIG_DRM_STI) += sti/
> > > obj-$(CONFIG_DRM_IMX) += imx/
> > > +obj-y += ingenic/
> > > obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
> > > obj-$(CONFIG_DRM_MESON) += meson/
> > > obj-y += i2c/
> > > diff --git a/drivers/gpu/drm/ingenic/Kconfig
> > > b/drivers/gpu/drm/ingenic/Kconfig
> > > new file mode 100644
> > > index 000000000000..d82c3d37ec9c
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ingenic/Kconfig
> > > @@ -0,0 +1,16 @@
> > > +config DRM_INGENIC
> > > + tristate "DRM Support for Ingenic SoCs"
> > > + depends on MIPS || COMPILE_TEST
> > > + depends on DRM
> > > + depends on CMA
> > > + depends on OF
> > > + select DRM_BRIDGE
> > > + select DRM_PANEL_BRIDGE
> > > + select DRM_KMS_HELPER
> > > + select DRM_KMS_CMA_HELPER
> > > + select DRM_GEM_CMA_HELPER
> > > + select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
> > > + help
> > > + Choose this option for DRM support for the Ingenic SoCs.
> > > +
> > > + If M is selected the module will be called ingenic-drm.
> > > diff --git a/drivers/gpu/drm/ingenic/Makefile
> > > b/drivers/gpu/drm/ingenic/Makefile
> > > new file mode 100644
> > > index 000000000000..11cac42ce0bb
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ingenic/Makefile
> > > @@ -0,0 +1 @@
> > > +obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> > > diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c
> > > b/drivers/gpu/drm/ingenic/ingenic-drm.c
> > > new file mode 100644
> > > index 000000000000..18120deea96f
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> > > @@ -0,0 +1,896 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +//
> > > +// Ingenic JZ47xx KMS driver
> > > +//
> > > +// Copyright (C) 2019, Paul Cercueil <paul@...pouillou.net>
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/dma-mapping.h>
> > > +#include <linux/module.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include <drm/drm_atomic.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_crtc.h>
> > > +#include <drm/drm_crtc_helper.h>
> > > +#include <drm/drm_drv.h>
> > > +#include <drm/drm_gem_cma_helper.h>
> > > +#include <drm/drm_fb_cma_helper.h>
> > > +#include <drm/drm_fb_helper.h>
> > > +#include <drm/drm_fourcc.h>
> > > +#include <drm/drm_gem_framebuffer_helper.h>
> > > +#include <drm/drm_irq.h>
> > > +#include <drm/drm_panel.h>
> > > +#include <drm/drm_plane.h>
> > > +#include <drm/drm_plane_helper.h>
> > > +#include <drm/drm_probe_helper.h>
> > > +#include <drm/drm_vblank.h>
> > > +
> > > +#include <dt-bindings/display/ingenic,drm.h>
> > > +
> > > +#include "../drm_internal.h"
> > > +
> > > +#define JZ_REG_LCD_CFG 0x00
> > > +#define JZ_REG_LCD_VSYNC 0x04
> > > +#define JZ_REG_LCD_HSYNC 0x08
> > > +#define JZ_REG_LCD_VAT 0x0C
> > > +#define JZ_REG_LCD_DAH 0x10
> > > +#define JZ_REG_LCD_DAV 0x14
> > > +#define JZ_REG_LCD_PS 0x18
> > > +#define JZ_REG_LCD_CLS 0x1C
> > > +#define JZ_REG_LCD_SPL 0x20
> > > +#define JZ_REG_LCD_REV 0x24
> > > +#define JZ_REG_LCD_CTRL 0x30
> > > +#define JZ_REG_LCD_STATE 0x34
> > > +#define JZ_REG_LCD_IID 0x38
> > > +#define JZ_REG_LCD_DA0 0x40
> > > +#define JZ_REG_LCD_SA0 0x44
> > > +#define JZ_REG_LCD_FID0 0x48
> > > +#define JZ_REG_LCD_CMD0 0x4C
> > > +#define JZ_REG_LCD_DA1 0x50
> > > +#define JZ_REG_LCD_SA1 0x54
> > > +#define JZ_REG_LCD_FID1 0x58
> > > +#define JZ_REG_LCD_CMD1 0x5C
> > > +
> > > +#define JZ_LCD_CFG_SLCD BIT(31)
> > > +#define JZ_LCD_CFG_PS_DISABLE BIT(23)
> > > +#define JZ_LCD_CFG_CLS_DISABLE BIT(22)
> > > +#define JZ_LCD_CFG_SPL_DISABLE BIT(21)
> > > +#define JZ_LCD_CFG_REV_DISABLE BIT(20)
> > > +#define JZ_LCD_CFG_HSYNCM BIT(19)
> > > +#define JZ_LCD_CFG_PCLKM BIT(18)
> > > +#define JZ_LCD_CFG_INV BIT(17)
> > > +#define JZ_LCD_CFG_SYNC_DIR BIT(16)
> > > +#define JZ_LCD_CFG_PS_POLARITY BIT(15)
> > > +#define JZ_LCD_CFG_CLS_POLARITY BIT(14)
> > > +#define JZ_LCD_CFG_SPL_POLARITY BIT(13)
> > > +#define JZ_LCD_CFG_REV_POLARITY BIT(12)
> > > +#define JZ_LCD_CFG_HSYNC_ACTIVE_LOW BIT(11)
> > > +#define JZ_LCD_CFG_PCLK_FALLING_EDGE BIT(10)
> > > +#define JZ_LCD_CFG_DE_ACTIVE_LOW BIT(9)
> > > +#define JZ_LCD_CFG_VSYNC_ACTIVE_LOW BIT(8)
> > > +#define JZ_LCD_CFG_18_BIT BIT(7)
> > > +#define JZ_LCD_CFG_PDW (BIT(5) | BIT(4))
> > > +#define JZ_LCD_CFG_MODE_MASK 0xf
> > > +
> > > +#define JZ_LCD_VSYNC_VPS_OFFSET 16
> > > +#define JZ_LCD_VSYNC_VPE_OFFSET 0
> > > +
> > > +#define JZ_LCD_HSYNC_HPS_OFFSET 16
> > > +#define JZ_LCD_HSYNC_HPE_OFFSET 0
> > > +
> > > +#define JZ_LCD_VAT_HT_OFFSET 16
> > > +#define JZ_LCD_VAT_VT_OFFSET 0
> > > +
> > > +#define JZ_LCD_DAH_HDS_OFFSET 16
> > > +#define JZ_LCD_DAH_HDE_OFFSET 0
> > > +
> > > +#define JZ_LCD_DAV_VDS_OFFSET 16
> > > +#define JZ_LCD_DAV_VDE_OFFSET 0
> > > +
> > > +#define JZ_LCD_CTRL_BURST_4 (0x0 << 28)
> > > +#define JZ_LCD_CTRL_BURST_8 (0x1 << 28)
> > > +#define JZ_LCD_CTRL_BURST_16 (0x2 << 28)
> > > +#define JZ_LCD_CTRL_RGB555 BIT(27)
> > > +#define JZ_LCD_CTRL_OFUP BIT(26)
> > > +#define JZ_LCD_CTRL_FRC_GRAYSCALE_16 (0x0 << 24)
> > > +#define JZ_LCD_CTRL_FRC_GRAYSCALE_4 (0x1 << 24)
> > > +#define JZ_LCD_CTRL_FRC_GRAYSCALE_2 (0x2 << 24)
> > > +#define JZ_LCD_CTRL_PDD_MASK (0xff << 16)
> > > +#define JZ_LCD_CTRL_EOF_IRQ BIT(13)
> > > +#define JZ_LCD_CTRL_SOF_IRQ BIT(12)
> > > +#define JZ_LCD_CTRL_OFU_IRQ BIT(11)
> > > +#define JZ_LCD_CTRL_IFU0_IRQ BIT(10)
> > > +#define JZ_LCD_CTRL_IFU1_IRQ BIT(9)
> > > +#define JZ_LCD_CTRL_DD_IRQ BIT(8)
> > > +#define JZ_LCD_CTRL_QDD_IRQ BIT(7)
> > > +#define JZ_LCD_CTRL_REVERSE_ENDIAN BIT(6)
> > > +#define JZ_LCD_CTRL_LSB_FISRT BIT(5)
> > > +#define JZ_LCD_CTRL_DISABLE BIT(4)
> > > +#define JZ_LCD_CTRL_ENABLE BIT(3)
> > > +#define JZ_LCD_CTRL_BPP_1 0x0
> > > +#define JZ_LCD_CTRL_BPP_2 0x1
> > > +#define JZ_LCD_CTRL_BPP_4 0x2
> > > +#define JZ_LCD_CTRL_BPP_8 0x3
> > > +#define JZ_LCD_CTRL_BPP_15_16 0x4
> > > +#define JZ_LCD_CTRL_BPP_18_24 0x5
> > > +#define JZ_LCD_CTRL_BPP_MASK (JZ_LCD_CTRL_RGB555 | (0x7 << 0))
> > > +
> > > +#define JZ_LCD_CMD_SOF_IRQ BIT(31)
> > > +#define JZ_LCD_CMD_EOF_IRQ BIT(30)
> > > +#define JZ_LCD_CMD_ENABLE_PAL BIT(28)
> > > +
> > > +#define JZ_LCD_SYNC_MASK 0x3ff
> > > +
> > > +#define JZ_LCD_STATE_EOF_IRQ BIT(5)
> > > +#define JZ_LCD_STATE_SOF_IRQ BIT(4)
> > > +#define JZ_LCD_STATE_DISABLED BIT(0)
> > > +
> > > +struct ingenic_framedesc {
> > > + uint32_t next;
> > > + uint32_t addr;
> > > + uint32_t id;
> > > + uint32_t cmd;
> > > +} __packed;
> > > +
> > > +struct jz_soc_info {
> > > + bool needs_dev_clk;
> > > +};
> > > +
> > > +struct ingenic_drm {
> > > + struct device *dev;
> >
> > Embedding is kinda the new thing, since it also prevents people from
> > using
> > devm_ for this, which is (strictly speaking, not that it matters much)
> > the
> > wrong lifetime for drm allocations. There's some patches from Noralf
> > that
> > should land soon to make this a bit more convenient.
> >
> > > + void __iomem *base;
> > > + struct regmap *map;
> > > + struct clk *lcd_clk, *pix_clk;
> > > +
> > > + u32 lcd_mode;
> > > +
> > > + struct ingenic_framedesc *framedesc;
> > > + dma_addr_t framedesc_phys;
> > > +
> > > + struct drm_device *drm;
> > > + struct drm_plane primary;
> > > + struct drm_crtc crtc;
> > > + struct drm_connector connector;
> > > + struct drm_encoder encoder;
> >
> > Any reason you didn't opt for the drm_simple_display_pipe helpers? Since
> > you have just 1:1:1 between crtc/plane/encoder that will allow you to
> > ditch lots of boilerplate.
> >
> > https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#simple-kms-helper-reference
> >
> > > + struct drm_panel *panel;
> > > +
> > > + struct device_node *panel_node;
> >
> > There's panel bridge helpers which takes a panel and wraps it into a
> > drm_bridge (which you can glue into the simple pipe helpers), giving you
> > the connector for free.
> >
> > https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#panel-bridge-helper-reference
>
> I'm having some trouble using this; if I use a drm_bridge and attach it
> directly to the encoder, how can I get a pointer to the drm_connector?
> I need it to retrieve the connector->display_info.bus_flags.
Not sure why you need these? bridges also have callbacks to adjust state,
crtc code shouldn't really dig around in connectors.
-Daniel
>
> Thanks,
> -Paul
>
> > This should cover all the bigger items, details look already really
> > tidy.
> >
> > Cheers, Daniel
> >
> > > +
> > > + unsigned short ps_start, ps_end, cls_start,
> > > + cls_end, spl_start, spl_end, rev_start;
> > > +};
> > > +
> > > +static const uint32_t ingenic_drm_primary_formats[] = {
> > > + DRM_FORMAT_XRGB1555,
> > > + DRM_FORMAT_RGB565,
> > > + DRM_FORMAT_XRGB8888,
> > > +};
> > > +
> > > +static bool ingenic_drm_writeable_reg(struct device *dev, unsigned
> > > int reg)
> > > +{
> > > + switch (reg) {
> > > + case JZ_REG_LCD_IID:
> > > + case JZ_REG_LCD_SA0:
> > > + case JZ_REG_LCD_FID0:
> > > + case JZ_REG_LCD_CMD0:
> > > + case JZ_REG_LCD_SA1:
> > > + case JZ_REG_LCD_FID1:
> > > + case JZ_REG_LCD_CMD1:
> > > + return false;
> > > + default:
> > > + return true;
> > > + }
> > > +}
> > > +
> > > +static const struct regmap_config ingenic_drm_regmap_config = {
> > > + .reg_bits = 32,
> > > + .val_bits = 32,
> > > + .reg_stride = 4,
> > > +
> > > + .max_register = JZ_REG_LCD_CMD1,
> > > + .writeable_reg = ingenic_drm_writeable_reg,
> > > +};
> > > +
> > > +static inline struct ingenic_drm *drm_crtc_get_priv(struct
> > > drm_crtc *crtc)
> > > +{
> > > + return container_of(crtc, struct ingenic_drm, crtc);
> > > +}
> > > +
> > > +static inline struct ingenic_drm *drm_plane_get_priv(struct
> > > drm_plane *plane)
> > > +{
> > > + return container_of(plane, struct ingenic_drm, primary);
> > > +}
> > > +
> > > +static inline struct ingenic_drm *drm_conn_get_priv(struct
> > > drm_connector *conn)
> > > +{
> > > + return container_of(conn, struct ingenic_drm, connector);
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
> > > + struct drm_crtc_state *state)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_STATE, 0);
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > + JZ_LCD_CTRL_ENABLE | JZ_LCD_CTRL_DISABLE,
> > > + JZ_LCD_CTRL_ENABLE);
> > > +
> > > + drm_panel_enable(priv->panel);
> > > +
> > > + drm_crtc_vblank_on(crtc);
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> > > + struct drm_crtc_state *state)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > + unsigned int var;
> > > +
> > > + drm_crtc_vblank_off(crtc);
> > > +
> > > + drm_panel_disable(priv->panel);
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > + JZ_LCD_CTRL_DISABLE, JZ_LCD_CTRL_DISABLE);
> > > +
> > > + regmap_read_poll_timeout(priv->map, JZ_REG_LCD_STATE, var,
> > > + var & JZ_LCD_STATE_DISABLED,
> > > + 1000, 0);
> > > +}
> > > +
> > > +static inline bool ingenic_drm_lcd_is_special_mode(u32 mode)
> > > +{
> > > + switch (mode) {
> > > + case JZ_DRM_LCD_SPECIAL_TFT_1:
> > > + case JZ_DRM_LCD_SPECIAL_TFT_2:
> > > + case JZ_DRM_LCD_SPECIAL_TFT_3:
> > > + return true;
> > > + default:
> > > + return false;
> > > + }
> > > +}
> > > +
> > > +static inline bool ingenic_drm_lcd_is_stn_mode(u32 mode)
> > > +{
> > > + switch (mode) {
> > > + case JZ_DRM_LCD_SINGLE_COLOR_STN:
> > > + case JZ_DRM_LCD_SINGLE_MONOCHROME_STN:
> > > + case JZ_DRM_LCD_DUAL_COLOR_STN:
> > > + case JZ_DRM_LCD_DUAL_MONOCHROME_STN:
> > > + return true;
> > > + default:
> > > + return false;
> > > + }
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_update_timings(struct ingenic_drm
> > > *priv,
> > > + struct drm_display_mode *mode)
> > > +{
> > > + unsigned int vpe, vds, vde, vt, hpe, hds, hde, ht;
> > > +
> > > + vpe = mode->vsync_end - mode->vsync_start;
> > > + vds = mode->vtotal - mode->vsync_start;
> > > + vde = vds + mode->vdisplay;
> > > + vt = vde + mode->vsync_start - mode->vdisplay;
> > > +
> > > + hpe = mode->hsync_end - mode->hsync_start;
> > > + hds = mode->htotal - mode->hsync_start;
> > > + hde = hds + mode->hdisplay;
> > > + ht = hde + mode->hsync_start - mode->hdisplay;
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_VSYNC,
> > > + 0 << JZ_LCD_VSYNC_VPS_OFFSET |
> > > + vpe << JZ_LCD_VSYNC_VPE_OFFSET);
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_HSYNC,
> > > + 0 << JZ_LCD_HSYNC_HPS_OFFSET |
> > > + hpe << JZ_LCD_HSYNC_HPE_OFFSET);
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_VAT,
> > > + ht << JZ_LCD_VAT_HT_OFFSET |
> > > + vt << JZ_LCD_VAT_VT_OFFSET);
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_DAH,
> > > + hds << JZ_LCD_DAH_HDS_OFFSET |
> > > + hde << JZ_LCD_DAH_HDE_OFFSET);
> > > + regmap_write(priv->map, JZ_REG_LCD_DAV,
> > > + vds << JZ_LCD_DAV_VDS_OFFSET |
> > > + vde << JZ_LCD_DAV_VDE_OFFSET);
> > > +
> > > + if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> > > + regmap_write(priv->map, JZ_REG_LCD_PS, hde << 16 | (hde + 1));
> > > + regmap_write(priv->map, JZ_REG_LCD_CLS, hde << 16 | (hde + 1));
> > > + regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
> > > + regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
> > > + }
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_update_cfg(struct ingenic_drm *priv,
> > > + struct drm_display_mode *mode)
> > > +
> > > +{
> > > + unsigned int cfg = priv->lcd_mode;
> > > + u32 bus_flags = priv->connector.display_info.bus_flags;
> > > +
> > > + if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> > > + cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
> > > + if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> > > + cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
> > > + if (bus_flags & DRM_BUS_FLAG_DE_LOW)
> > > + cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
> > > + if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
> > > + cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
> > > +
> > > + if (ingenic_drm_lcd_is_special_mode(priv->lcd_mode)) {
> > > + // TODO: Is that valid for all special modes?
> > > + cfg |= JZ_LCD_CFG_REV_POLARITY;
> > > + } else {
> > > + cfg |= JZ_LCD_CFG_PS_DISABLE
> > > + | JZ_LCD_CFG_CLS_DISABLE
> > > + | JZ_LCD_CFG_SPL_DISABLE
> > > + | JZ_LCD_CFG_REV_DISABLE;
> > > + }
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_CFG, cfg);
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
> > > + unsigned int bpp)
> > > +{
> > > + unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
> > > +
> > > + switch (bpp) {
> > > + case 1:
> > > + ctrl |= JZ_LCD_CTRL_BPP_1;
> > > + break;
> > > + case 2:
> > > + ctrl |= JZ_LCD_CTRL_BPP_2;
> > > + break;
> > > + case 4:
> > > + ctrl |= JZ_LCD_CTRL_BPP_4;
> > > + break;
> > > + case 8:
> > > + ctrl |= JZ_LCD_CTRL_BPP_8;
> > > + break;
> > > + case 15:
> > > + ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
> > > + case 16:
> > > + ctrl |= JZ_LCD_CTRL_BPP_15_16;
> > > + break;
> > > + case 18:
> > > + case 24:
> > > + case 32:
> > > + ctrl |= JZ_LCD_CTRL_BPP_18_24;
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > + JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
> > > + JZ_LCD_CTRL_BPP_MASK, ctrl);
> > > +}
> > > +
> > > +static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
> > > + struct drm_crtc_state *state)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > + long rate;
> > > +
> > > + if (!drm_atomic_crtc_needs_modeset(state))
> > > + return 0;
> > > +
> > > + rate = clk_round_rate(priv->pix_clk,
> > > + state->adjusted_mode.clock * 1000);
> > > + if (rate < 0)
> > > + return rate;
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> > > + struct drm_crtc_state *oldstate)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > + struct drm_crtc_state *state = crtc->state;
> > > + struct drm_pending_vblank_event *event = state->event;
> > > + struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
> > > + const struct drm_format_info *finfo;
> > > + unsigned int width, height;
> > > +
> > > + if (drm_atomic_crtc_needs_modeset(state)) {
> > > + finfo = drm_format_info(drm_fb->format->format);
> > > + width = state->adjusted_mode.hdisplay;
> > > + height = state->adjusted_mode.vdisplay;
> > > +
> > > + ingenic_drm_crtc_update_timings(priv, &state->mode);
> > > +
> > > + ingenic_drm_crtc_update_ctrl(priv, finfo->depth);
> > > + ingenic_drm_crtc_update_cfg(priv, &state->adjusted_mode);
> > > +
> > > + clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> > > +
> > > + regmap_write(priv->map, JZ_REG_LCD_DA0, priv->framedesc->next);
> > > + }
> > > +
> > > + if (event) {
> > > + state->event = NULL;
> > > +
> > > + spin_lock_irq(&crtc->dev->event_lock);
> > > + if (drm_crtc_vblank_get(crtc) == 0)
> > > + drm_crtc_arm_vblank_event(crtc, event);
> > > + else
> > > + drm_crtc_send_vblank_event(crtc, event);
> > > + spin_unlock_irq(&crtc->dev->event_lock);
> > > + }
> > > +}
> > > +
> > > +static void ingenic_drm_plane_atomic_update(struct drm_plane
> > > *plane,
> > > + struct drm_plane_state *oldstate)
> > > +{
> > > + struct ingenic_drm *priv = drm_plane_get_priv(plane);
> > > + struct drm_plane_state *state = plane->state;
> > > + const struct drm_format_info *finfo;
> > > + unsigned int width, height;
> > > +
> > > + finfo = drm_format_info(state->fb->format->format);
> > > + width = state->crtc->state->adjusted_mode.hdisplay;
> > > + height = state->crtc->state->adjusted_mode.vdisplay;
> > > +
> > > + priv->framedesc->addr = drm_fb_cma_get_gem_addr(state->fb, state,
> > > 0);
> > > +
> > > + priv->framedesc->cmd = width * height * ((finfo->depth + 7) / 8)
> > > / 4;
> > > + priv->framedesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
> > > +}
> > > +
> > > +static enum drm_connector_status
> > > +ingenic_drm_conn_detect(struct drm_connector *conn, bool force)
> > > +{
> > > + struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > > +
> > > + if (priv->panel) {
> > > + drm_panel_attach(priv->panel, conn);
> > > +
> > > + return connector_status_connected;
> > > + }
> > > +
> > > + return connector_status_disconnected;
> > > +}
> > > +
> > > +static void ingenic_drm_conn_destroy(struct drm_connector *conn)
> > > +{
> > > + struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > > +
> > > + if (priv->panel)
> > > + drm_panel_detach(priv->panel);
> > > +
> > > + drm_connector_cleanup(conn);
> > > +}
> > > +
> > > +static int ingenic_drm_conn_get_modes(struct drm_connector *conn)
> > > +{
> > > + struct ingenic_drm *priv = drm_conn_get_priv(conn);
> > > +
> > > + if (priv->panel)
> > > + return priv->panel->funcs->get_modes(priv->panel);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
> > > +{
> > > + struct drm_device *drm = arg;
> > > + struct ingenic_drm *priv = drm->dev_private;
> > > + unsigned int state;
> > > +
> > > + regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_STATE,
> > > + JZ_LCD_STATE_EOF_IRQ, 0);
> > > +
> > > + if (state & JZ_LCD_STATE_EOF_IRQ)
> > > + drm_crtc_handle_vblank(&priv->crtc);
> > > +
> > > + return IRQ_HANDLED;
> > > +}
> > > +
> > > +static int ingenic_drm_enable_vblank(struct drm_crtc *crtc)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > + JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static void ingenic_drm_disable_vblank(struct drm_crtc *crtc)
> > > +{
> > > + struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
> > > +
> > > + regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
> > > JZ_LCD_CTRL_EOF_IRQ, 0);
> > > +}
> > > +
> > > +DEFINE_DRM_GEM_CMA_FOPS(ingenic_drm_fops);
> > > +
> > > +static struct drm_driver ingenic_drm_driver_data = {
> > > + .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
> > > + | DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
> > > + .name = "ingenic-drm",
> > > + .desc = "DRM module for Ingenic SoCs",
> > > + .date = "20190228",
> > > + .major = 1,
> > > + .minor = 0,
> > > + .patchlevel = 0,
> > > +
> > > + .fops = &ingenic_drm_fops,
> > > +
> > > + .dumb_create = drm_gem_cma_dumb_create,
> > > + .gem_free_object_unlocked = drm_gem_cma_free_object,
> > > + .gem_vm_ops = &drm_gem_cma_vm_ops,
> > > +
> > > + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> > > + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> > > + .gem_prime_import = drm_gem_prime_import,
> > > + .gem_prime_export = drm_gem_prime_export,
> > > + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
> > > + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> > > + .gem_prime_vmap = drm_gem_cma_prime_vmap,
> > > + .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
> > > + .gem_prime_mmap = drm_gem_cma_prime_mmap,
> > > +
> > > + .irq_handler = ingenic_drm_irq_handler,
> > > +};
> > > +
> > > +static const struct drm_plane_funcs
> > > ingenic_drm_primary_plane_funcs = {
> > > + .update_plane = drm_atomic_helper_update_plane,
> > > + .disable_plane = drm_atomic_helper_disable_plane,
> > > + .reset = drm_atomic_helper_plane_reset,
> > > +
> > > + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> > > + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> > > +};
> > > +
> > > +static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {
> > > + .reset = drm_atomic_helper_crtc_reset,
> > > + .set_config = drm_atomic_helper_set_config,
> > > + .page_flip = drm_atomic_helper_page_flip,
> > > +
> > > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > > +
> > > + .enable_vblank = ingenic_drm_enable_vblank,
> > > + .disable_vblank = ingenic_drm_disable_vblank,
> > > +
> > > + .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > > +};
> > > +
> > > +static const struct drm_connector_funcs ingenic_drm_conn_funcs = {
> > > + .fill_modes = drm_helper_probe_single_connector_modes,
> > > + .detect = ingenic_drm_conn_detect,
> > > + .destroy = ingenic_drm_conn_destroy,
> > > + .reset = drm_atomic_helper_connector_reset,
> > > + .atomic_duplicate_state =
> > > drm_atomic_helper_connector_duplicate_state,
> > > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > +};
> > > +
> > > +static const struct drm_plane_helper_funcs
> > > ingenic_drm_plane_helper_funcs = {
> > > + .atomic_update = ingenic_drm_plane_atomic_update,
> > > + .prepare_fb = drm_gem_fb_prepare_fb,
> > > +};
> > > +
> > > +static const struct drm_crtc_helper_funcs
> > > ingenic_drm_crtc_helper_funcs = {
> > > + .atomic_enable = ingenic_drm_crtc_atomic_enable,
> > > + .atomic_disable = ingenic_drm_crtc_atomic_disable,
> > > + .atomic_flush = ingenic_drm_crtc_atomic_flush,
> > > + .atomic_check = ingenic_drm_crtc_atomic_check,
> > > +};
> > > +
> > > +static const struct drm_connector_helper_funcs
> > > ingenic_drm_conn_helper_funcs = {
> > > + .get_modes = ingenic_drm_conn_get_modes,
> > > +};
> > > +
> > > +static const struct drm_mode_config_funcs
> > > ingenic_drm_mode_config_funcs = {
> > > + .fb_create = drm_gem_fb_create,
> > > + .output_poll_changed = drm_fb_helper_output_poll_changed,
> > > + .atomic_check = drm_atomic_helper_check,
> > > + .atomic_commit = drm_atomic_helper_commit,
> > > +};
> > > +
> > > +static const struct drm_encoder_funcs ingenic_drm_encoder_funcs = {
> > > + .destroy = drm_encoder_cleanup,
> > > +};
> > > +
> > > +static int ingenic_drm_probe(struct platform_device *pdev)
> > > +{
> > > + const struct jz_soc_info *soc_info;
> > > + struct device *dev = &pdev->dev;
> > > + struct ingenic_drm *priv;
> > > + struct clk *parent_clk;
> > > + struct drm_device *drm;
> > > + struct resource *mem;
> > > + void __iomem *base;
> > > + long parent_rate;
> > > + int ret, irq;
> > > +
> > > + soc_info = device_get_match_data(dev);
> > > + if (!soc_info)
> > > + return -EINVAL;
> > > +
> > > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > > + if (!priv)
> > > + return -ENOMEM;
> > > +
> > > + priv->dev = dev;
> > > +
> > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + priv->base = base = devm_ioremap_resource(dev, mem);
> > > + if (IS_ERR(base))
> > > + return PTR_ERR(base);
> > > +
> > > + irq = platform_get_irq(pdev, 0);
> > > + if (irq < 0) {
> > > + dev_err(dev, "Failed to get platform irq\n");
> > > + return -ENOENT;
> > > + }
> > > +
> > > + priv->map = devm_regmap_init_mmio(dev, base,
> > > + &ingenic_drm_regmap_config);
> > > + if (IS_ERR(priv->map)) {
> > > + dev_err(dev, "Failed to create regmap\n");
> > > + return PTR_ERR(priv->map);
> > > + }
> > > +
> > > + if (soc_info->needs_dev_clk) {
> > > + priv->lcd_clk = devm_clk_get(dev, "lcd");
> > > + if (IS_ERR(priv->lcd_clk)) {
> > > + dev_err(dev, "Failed to get lcd clock\n");
> > > + return PTR_ERR(priv->lcd_clk);
> > > + }
> > > + }
> > > +
> > > + priv->pix_clk = devm_clk_get(dev, "lcd_pclk");
> > > + if (IS_ERR(priv->pix_clk)) {
> > > + dev_err(dev, "Failed to get pixel clock\n");
> > > + return PTR_ERR(priv->pix_clk);
> > > + }
> > > +
> > > + priv->panel_node = of_parse_phandle(dev->of_node,
> > > "ingenic,panel", 0);
> > > + if (!priv->panel_node) {
> > > + DRM_INFO("No panel found");
> > > + } else {
> > > + priv->panel = of_drm_find_panel(priv->panel_node);
> > > + of_node_put(priv->panel_node);
> > > +
> > > + if (IS_ERR(priv->panel)) {
> > > + if (PTR_ERR(priv->panel) == -EPROBE_DEFER)
> > > + return -EPROBE_DEFER;
> > > +
> > > + priv->panel = NULL;
> > > + } else {
> > > + ret = drm_panel_prepare(priv->panel);
> > > + if (ret && ret != -ENOSYS)
> > > + return ret;
> > > + }
> > > + }
> > > +
> > > + if (priv->panel) {
> > > + ret = device_property_read_u32(dev, "ingenic,lcd-mode",
> > > + &priv->lcd_mode);
> > > + if (ret) {
> > > + dev_err(dev, "Unable to read ingenic,lcd-mode property\n");
> > > + return ret;
> > > + }
> > > + }
> > > +
> > > + priv->framedesc = dma_alloc_coherent(dev,
> > > sizeof(*priv->framedesc),
> > > + &priv->framedesc_phys, GFP_KERNEL);
> > > + if (!priv->framedesc)
> > > + return -ENOMEM;
> > > +
> > > + priv->framedesc->next = priv->framedesc_phys;
> > > + priv->framedesc->id = 0xdeafbead;
> > > +
> > > + drm = drm_dev_alloc(&ingenic_drm_driver_data, dev);
> > > + if (IS_ERR(drm)) {
> > > + ret = PTR_ERR(drm);
> > > + goto err_free_dma;
> > > + }
> > > +
> > > + priv->drm = drm;
> > > +
> > > + drm_mode_config_init(drm);
> > > + drm->mode_config.min_width = 0;
> > > + drm->mode_config.min_height = 0;
> > > + drm->mode_config.max_width = 800;
> > > + drm->mode_config.max_height = 600;
> > > + drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
> > > +
> > > + drm_plane_helper_add(&priv->primary,
> > > &ingenic_drm_plane_helper_funcs);
> > > +
> > > + ret = drm_universal_plane_init(drm, &priv->primary,
> > > + 0, &ingenic_drm_primary_plane_funcs,
> > > + ingenic_drm_primary_formats,
> > > + ARRAY_SIZE(ingenic_drm_primary_formats),
> > > + NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to register primary plane: %i\n", ret);
> > > + goto err_unref_drm;
> > > + }
> > > +
> > > + drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
> > > +
> > > + ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
> > > + NULL, &ingenic_drm_crtc_funcs, NULL);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to init CRTC: %i\n", ret);
> > > + goto err_cleanup_plane;
> > > + }
> > > +
> > > + drm_connector_helper_add(&priv->connector,
> > > + &ingenic_drm_conn_helper_funcs);
> > > + ret = drm_connector_init(drm, &priv->connector,
> > > + &ingenic_drm_conn_funcs,
> > > + DRM_MODE_CONNECTOR_Unknown);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to init connector: %i\n", ret);
> > > + goto err_cleanup_crtc;
> > > + }
> > > +
> > > + priv->encoder.possible_crtcs = 1;
> > > +
> > > + ret = drm_encoder_init(drm, &priv->encoder,
> > > &ingenic_drm_encoder_funcs,
> > > + DRM_MODE_ENCODER_NONE, NULL);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to init encoder: %i\n", ret);
> > > + goto err_cleanup_connector;
> > > + }
> > > +
> > > + drm_connector_attach_encoder(&priv->connector, &priv->encoder);
> > > +
> > > + platform_set_drvdata(pdev, drm);
> > > + priv->drm = drm;
> > > + drm->dev_private = priv;
> > > +
> > > + ret = drm_irq_install(drm, irq);
> > > + if (ret) {
> > > + dev_err(dev, "Unable to install IRQ handler\n");
> > > + goto err_cleanup_encoder;
> > > + }
> > > +
> > > + ret = drm_vblank_init(drm, 1);
> > > + if (ret) {
> > > + dev_err(dev, "Failed calling drm_vblank_init()\n");
> > > + goto err_uninstall_irq;
> > > + }
> > > +
> > > + drm_mode_config_reset(drm);
> > > +
> > > + ret = clk_prepare_enable(priv->pix_clk);
> > > + if (ret) {
> > > + dev_err(dev, "Unable to start pixel clock\n");
> > > + goto err_cleanup_vblank;
> > > + }
> > > +
> > > + if (priv->lcd_clk) {
> > > + parent_clk = clk_get_parent(priv->lcd_clk);
> > > + parent_rate = clk_get_rate(parent_clk);
> > > +
> > > + /* LCD Device clock must be 3x the pixel clock for STN panels,
> > > + * or 1.5x the pixel clock for TFT panels. To avoid having to
> > > + * check for the LCD device clock everytime we do a mode change,
> > > + * we set the LCD device clock to the highest rate possible.
> > > + */
> > > + ret = clk_set_rate(priv->lcd_clk, parent_rate);
> > > + if (ret) {
> > > + dev_err(dev, "Unable to set LCD clock rate\n");
> > > + goto err_pixclk_disable;
> > > + }
> > > +
> > > + ret = clk_prepare_enable(priv->lcd_clk);
> > > + if (ret) {
> > > + dev_err(dev, "Unable to start lcd clock\n");
> > > + goto err_pixclk_disable;
> > > + }
> > > + }
> > > +
> > > + ret = drm_fbdev_generic_setup(drm, 16);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to init fbdev\n");
> > > + goto err_devclk_disable;
> > > + }
> > > +
> > > + ret = drm_dev_register(drm, 0);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to register DRM driver\n");
> > > + goto err_cleanup_fbdev;
> > > + }
> > > +
> > > + return 0;
> > > +
> > > +err_cleanup_fbdev:
> > > + drm_mode_config_cleanup(drm);
> > > +err_devclk_disable:
> > > + if (priv->lcd_clk)
> > > + clk_disable_unprepare(priv->lcd_clk);
> > > +err_pixclk_disable:
> > > + clk_disable_unprepare(priv->pix_clk);
> > > +err_cleanup_vblank:
> > > + drm_vblank_cleanup(drm);
> > > +err_uninstall_irq:
> > > + drm_irq_uninstall(drm);
> > > +err_cleanup_encoder:
> > > + drm_encoder_cleanup(&priv->encoder);
> > > +err_cleanup_connector:
> > > + drm_connector_cleanup(&priv->connector);
> > > +err_cleanup_crtc:
> > > + drm_crtc_cleanup(&priv->crtc);
> > > +err_cleanup_plane:
> > > + drm_plane_cleanup(&priv->primary);
> > > +err_unref_drm:
> > > + drm_dev_put(drm);
> > > +err_free_dma:
> > > + dma_free_coherent(dev, sizeof(*priv->framedesc),
> > > + priv->framedesc, priv->framedesc_phys);
> > > + return ret;
> > > +}
> > > +
> > > +static int ingenic_drm_remove(struct platform_device *pdev)
> > > +{
> > > + struct drm_device *drm = platform_get_drvdata(pdev);
> > > + struct ingenic_drm *priv = drm->dev_private;
> > > +
> > > + drm_dev_unregister(drm);
> > > + drm_mode_config_cleanup(drm);
> > > +
> > > + if (priv->lcd_clk)
> > > + clk_disable_unprepare(priv->lcd_clk);
> > > + clk_disable_unprepare(priv->pix_clk);
> > > +
> > > + drm_vblank_cleanup(drm);
> > > + drm_irq_uninstall(drm);
> > > +
> > > + drm_encoder_cleanup(&priv->encoder);
> > > + drm_connector_cleanup(&priv->connector);
> > > + drm_crtc_cleanup(&priv->crtc);
> > > + drm_plane_cleanup(&priv->primary);
> > > +
> > > + drm_dev_put(drm);
> > > +
> > > + dma_free_coherent(&pdev->dev, sizeof(*priv->framedesc),
> > > + priv->framedesc, priv->framedesc_phys);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct jz_soc_info jz4740_soc_info = {
> > > + .needs_dev_clk = true,
> > > +};
> > > +
> > > +static const struct jz_soc_info jz4725b_soc_info = {
> > > + .needs_dev_clk = false,
> > > +};
> > > +
> > > +static const struct of_device_id ingenic_drm_of_match[] = {
> > > + { .compatible = "ingenic,jz4740-drm", .data = &jz4740_soc_info },
> > > + { .compatible = "ingenic,jz4725b-drm", .data = &jz4725b_soc_info
> > > },
> > > + {},
> > > +};
> > > +
> > > +static struct platform_driver ingenic_drm_driver = {
> > > + .driver = {
> > > + .name = "ingenic-drm",
> > > + .of_match_table = of_match_ptr(ingenic_drm_of_match),
> > > + },
> > > + .probe = ingenic_drm_probe,
> > > + .remove = ingenic_drm_remove,
> > > +};
> > > +module_platform_driver(ingenic_drm_driver);
> > > +
> > > +MODULE_AUTHOR("Paul Cercueil <paul@...pouillou.net>");
> > > +MODULE_DESCRIPTION("DRM driver for the Ingenic SoCs\n");
> > > +MODULE_LICENSE("GPL v2");
> > > --
> > > 2.11.0
> > >
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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