Message-ID: <20210917145818.znqcgwii5s6b6a2n@gilmour>
Date:   Fri, 17 Sep 2021 16:58:18 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Kevin Tang <kevin3.tang@...il.com>
Cc:     maarten.lankhorst@...ux.intel.com, sean@...rly.run,
        airlied@...ux.ie, daniel@...ll.ch, robh+dt@...nel.org,
        mark.rutland@....com, pony1.wu@...il.com, orsonzhai@...il.com,
        zhang.lyra@...il.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v6 4/6] drm/sprd: add Unisoc's drm display controller
 driver

Hi,

On Fri, Aug 13, 2021 at 10:53:00PM +0800, Kevin Tang wrote:
> Adds DPU(Display Processor Unit) support for the Unisoc's display
> subsystem.
> It's support multi planes, scaler, rotation, PQ(Picture Quality) and more.
> 
> v2:
>   - Use drm_xxx to replace all DRM_XXX.
>   - Use kzalloc to replace devm_kzalloc for sprd_dpu structure init.
> 
> v3:
>   - Remove dpu_layer stuff layer and commit layers by aotmic_update
> 
> v4:
>   - Use drmm_helpers to allocate crtc and planes.
>   - Move rotation enum definitions to crtc layer reg bitfields.
>   - Move allocate crtc and planes to bind function.
> 
> v5:
>   - Fix the checkpatch warnings.
>   - Use mode_set_nofb instead of mode_valid callback.
>   - Follow the OF-Graph bindings, use of_graph_get_port_by_id
>     instead of of_parse_phandle.
>   - Use zpos to represent the layer position.
>   - Rebase to last drm misc branch.
> 
> v6:
>   - Disable and clear interrupts before register dpu IRQ
>   - Init dpi config used by crtc_state->adjusted_mode on mode_set_nofb
>   - Remove enable_irq and disable_irq function call.
>   - Remove drm_format_info function call.
> 
> Cc: Orson Zhai <orsonzhai@...il.com>
> Cc: Chunyan Zhang <zhang.lyra@...il.com>
> Signed-off-by: Kevin Tang <kevin.tang@...soc.com>
> ---
>  drivers/gpu/drm/sprd/Kconfig    |   1 +
>  drivers/gpu/drm/sprd/Makefile   |   3 +-
>  drivers/gpu/drm/sprd/sprd_dpu.c | 937 ++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/sprd/sprd_dpu.h | 109 ++++
>  drivers/gpu/drm/sprd/sprd_drm.c |   1 +
>  drivers/gpu/drm/sprd/sprd_drm.h |   2 +
>  6 files changed, 1052 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/sprd/sprd_dpu.c
>  create mode 100644 drivers/gpu/drm/sprd/sprd_dpu.h
> 
> diff --git a/drivers/gpu/drm/sprd/Kconfig b/drivers/gpu/drm/sprd/Kconfig
> index 726c3e76d..37762c333 100644
> --- a/drivers/gpu/drm/sprd/Kconfig
> +++ b/drivers/gpu/drm/sprd/Kconfig
> @@ -5,6 +5,7 @@ config DRM_SPRD
>  	select DRM_GEM_CMA_HELPER
>  	select DRM_KMS_CMA_HELPER
>  	select DRM_KMS_HELPER
> +	select VIDEOMODE_HELPERS
>  	help
>  	  Choose this option if you have a Unisoc chipset.
>  	  If M is selected the module will be called sprd_drm.
> diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> index 9850f00b8..ab12b95e6 100644
> --- a/drivers/gpu/drm/sprd/Makefile
> +++ b/drivers/gpu/drm/sprd/Makefile
> @@ -1,3 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
> -obj-y := sprd_drm.o
> +obj-y := sprd_drm.o \
> +	sprd_dpu.o
> diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
> new file mode 100644
> index 000000000..448dd4fb6
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.c
> @@ -0,0 +1,937 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#include <linux/component.h>
> +#include <linux/delay.h>
> +#include <linux/dma-buf.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/of_irq.h>
> +#include <linux/wait.h>
> +#include <linux/workqueue.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_plane_helper.h>
> +
> +#include "sprd_drm.h"
> +#include "sprd_dpu.h"
> +
> +/* Global control registers */
> +#define REG_DPU_CTRL	0x04
> +#define REG_DPU_CFG0	0x08
> +#define REG_PANEL_SIZE	0x20
> +#define REG_BLEND_SIZE	0x24
> +#define REG_BG_COLOR	0x2C
> +
> +/* Layer0 control registers */
> +#define REG_LAY_BASE_ADDR0	0x30
> +#define REG_LAY_BASE_ADDR1	0x34
> +#define REG_LAY_BASE_ADDR2	0x38
> +#define REG_LAY_CTRL		0x40
> +#define REG_LAY_SIZE		0x44
> +#define REG_LAY_PITCH		0x48
> +#define REG_LAY_POS		0x4C
> +#define REG_LAY_ALPHA		0x50
> +#define REG_LAY_CROP_START	0x5C
> +
> +/* Interrupt control registers */
> +#define REG_DPU_INT_EN		0x1E0
> +#define REG_DPU_INT_CLR		0x1E4
> +#define REG_DPU_INT_STS		0x1E8
> +
> +/* DPI control registers */
> +#define REG_DPI_CTRL		0x1F0
> +#define REG_DPI_H_TIMING	0x1F4
> +#define REG_DPI_V_TIMING	0x1F8
> +
> +/* MMU control registers */
> +#define REG_MMU_EN			0x800
> +#define REG_MMU_VPN_RANGE		0x80C
> +#define REG_MMU_VAOR_ADDR_RD		0x818
> +#define REG_MMU_VAOR_ADDR_WR		0x81C
> +#define REG_MMU_INV_ADDR_RD		0x820
> +#define REG_MMU_INV_ADDR_WR		0x824
> +#define REG_MMU_PPN1			0x83C
> +#define REG_MMU_RANGE1			0x840
> +#define REG_MMU_PPN2			0x844
> +#define REG_MMU_RANGE2			0x848
> +
> +/* Global control bits */
> +#define BIT_DPU_RUN			BIT(0)
> +#define BIT_DPU_STOP			BIT(1)
> +#define BIT_DPU_REG_UPDATE		BIT(2)
> +#define BIT_DPU_IF_EDPI			BIT(0)
> +
> +/* Layer control bits */
> +#define BIT_DPU_LAY_EN				BIT(0)
> +#define BIT_DPU_LAY_LAYER_ALPHA			(0x01 << 2)
> +#define BIT_DPU_LAY_COMBO_ALPHA			(0x02 << 2)
> +#define BIT_DPU_LAY_FORMAT_YUV422_2PLANE		(0x00 << 4)
> +#define BIT_DPU_LAY_FORMAT_YUV420_2PLANE		(0x01 << 4)
> +#define BIT_DPU_LAY_FORMAT_YUV420_3PLANE		(0x02 << 4)
> +#define BIT_DPU_LAY_FORMAT_ARGB8888			(0x03 << 4)
> +#define BIT_DPU_LAY_FORMAT_RGB565			(0x04 << 4)
> +#define BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3		(0x00 << 8)
> +#define BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0		(0x01 << 8)
> +#define BIT_DPU_LAY_NO_SWITCH			(0x00 << 10)
> +#define BIT_DPU_LAY_RB_OR_UV_SWITCH		(0x01 << 10)
> +#define BIT_DPU_LAY_MODE_BLEND_NORMAL		(0x00 << 16)
> +#define BIT_DPU_LAY_MODE_BLEND_PREMULT		(0x01 << 16)
> +#define BIT_DPU_LAY_ROTATION_0		(0x00 << 20)
> +#define BIT_DPU_LAY_ROTATION_90		(0x01 << 20)
> +#define BIT_DPU_LAY_ROTATION_180	(0x02 << 20)
> +#define BIT_DPU_LAY_ROTATION_270	(0x03 << 20)
> +#define BIT_DPU_LAY_ROTATION_0_M	(0x04 << 20)
> +#define BIT_DPU_LAY_ROTATION_90_M	(0x05 << 20)
> +#define BIT_DPU_LAY_ROTATION_180_M	(0x06 << 20)
> +#define BIT_DPU_LAY_ROTATION_270_M	(0x07 << 20)
> +
> +/* Interrupt control & status bits */
> +#define BIT_DPU_INT_DONE		BIT(0)
> +#define BIT_DPU_INT_TE			BIT(1)
> +#define BIT_DPU_INT_ERR			BIT(2)
> +#define BIT_DPU_INT_UPDATE_DONE		BIT(4)
> +#define BIT_DPU_INT_VSYNC		BIT(5)
> +#define BIT_DPU_INT_MMU_VAOR_RD		BIT(16)
> +#define BIT_DPU_INT_MMU_VAOR_WR		BIT(17)
> +#define BIT_DPU_INT_MMU_INV_RD		BIT(18)
> +#define BIT_DPU_INT_MMU_INV_WR		BIT(19)
> +
> +/* DPI control bits */
> +#define BIT_DPU_EDPI_TE_EN		BIT(8)
> +#define BIT_DPU_EDPI_FROM_EXTERNAL_PAD	BIT(10)
> +#define BIT_DPU_DPI_HALT_EN		BIT(16)
> +
> +static const u32 layer_fmts[] = {
> +	DRM_FORMAT_XRGB8888,
> +	DRM_FORMAT_XBGR8888,
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_ABGR8888,
> +	DRM_FORMAT_RGBA8888,
> +	DRM_FORMAT_BGRA8888,
> +	DRM_FORMAT_RGBX8888,
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_BGR565,
> +	DRM_FORMAT_NV12,
> +	DRM_FORMAT_NV21,
> +	DRM_FORMAT_NV16,
> +	DRM_FORMAT_NV61,
> +	DRM_FORMAT_YUV420,
> +	DRM_FORMAT_YVU420,
> +};
> +
> +struct sprd_plane {
> +	struct drm_plane base;
> +};
> +
> +static u32 check_mmu_isr(struct sprd_dpu *dpu, u32 reg_val)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	u32 mmu_mask = BIT_DPU_INT_MMU_VAOR_RD |
> +			BIT_DPU_INT_MMU_VAOR_WR |
> +			BIT_DPU_INT_MMU_INV_RD |
> +			BIT_DPU_INT_MMU_INV_WR;
> +	u32 val = reg_val & mmu_mask;
> +	int i;
> +
> +	if (val) {
> +		drm_err(dpu->drm, "--- iommu interrupt err: 0x%04x ---\n", val);
> +
> +		if (val & BIT_DPU_INT_MMU_INV_RD)
> +			drm_err(dpu->drm, "iommu invalid read error, addr: 0x%08x\n",
> +				readl(ctx->base + REG_MMU_INV_ADDR_RD));
> +		if (val & BIT_DPU_INT_MMU_INV_WR)
> +			drm_err(dpu->drm, "iommu invalid write error, addr: 0x%08x\n",
> +				readl(ctx->base + REG_MMU_INV_ADDR_WR));
> +		if (val & BIT_DPU_INT_MMU_VAOR_RD)
> +			drm_err(dpu->drm, "iommu va out of range read error, addr: 0x%08x\n",
> +				readl(ctx->base + REG_MMU_VAOR_ADDR_RD));
> +		if (val & BIT_DPU_INT_MMU_VAOR_WR)
> +			drm_err(dpu->drm, "iommu va out of range write error, addr: 0x%08x\n",
> +				readl(ctx->base + REG_MMU_VAOR_ADDR_WR));
> +
> +		for (i = 0; i < 8; i++) {
> +			reg_val = layer_reg_rd(ctx, REG_LAY_CTRL, i);
> +			if (reg_val & 0x1)
> +				drm_info(dpu->drm, "layer%d: 0x%x 0x%x 0x%x ctrl: 0x%x\n", i,
> +					layer_reg_rd(ctx, REG_LAY_BASE_ADDR0, i),
> +					layer_reg_rd(ctx, REG_LAY_BASE_ADDR1, i),
> +					layer_reg_rd(ctx, REG_LAY_BASE_ADDR2, i),
> +					layer_reg_rd(ctx, REG_LAY_CTRL, i));
> +		}
> +	}
> +
> +	return val;
> +}

We'll still want an Acked-by from one of the IOMMU maintainers. Last
time they commented they were against that.

> +static int dpu_wait_stop_done(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	int rc;
> +
> +	if (ctx->stopped)
> +		return 0;
> +
> +	rc = wait_event_interruptible_timeout(ctx->wait_queue, ctx->evt_stop,
> +					       msecs_to_jiffies(500));
> +	ctx->evt_stop = false;
> +
> +	ctx->stopped = true;
> +
> +	if (!rc) {
> +		drm_err(dpu->drm, "dpu wait for stop done time out!\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	return 0;
> +}
> +
> +static int dpu_wait_update_done(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	int rc;
> +
> +	ctx->evt_update = false;
> +
> +	rc = wait_event_interruptible_timeout(ctx->wait_queue, ctx->evt_update,
> +					       msecs_to_jiffies(500));
> +
> +	if (!rc) {
> +		drm_err(dpu->drm, "dpu wait for reg update done time out!\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	return 0;
> +}
> +
> +static u32 drm_format_to_dpu(struct drm_framebuffer *fb)
> +{
> +	u32 format = 0;
> +
> +	switch (fb->format->format) {
> +	case DRM_FORMAT_BGRA8888:
> +		/* BGRA8888 -> ARGB8888 */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0;
> +		format |= BIT_DPU_LAY_FORMAT_ARGB8888;
> +		break;
> +	case DRM_FORMAT_RGBX8888:
> +	case DRM_FORMAT_RGBA8888:
> +		/* RGBA8888 -> ABGR8888 */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0;
> +		fallthrough;
> +	case DRM_FORMAT_ABGR8888:
> +		/* RB switch */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		fallthrough;
> +	case DRM_FORMAT_ARGB8888:
> +		format |= BIT_DPU_LAY_FORMAT_ARGB8888;
> +		break;
> +	case DRM_FORMAT_XBGR8888:
> +		/* RB switch */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		fallthrough;
> +	case DRM_FORMAT_XRGB8888:
> +		format |= BIT_DPU_LAY_FORMAT_ARGB8888;
> +		break;
> +	case DRM_FORMAT_BGR565:
> +		/* RB switch */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		fallthrough;
> +	case DRM_FORMAT_RGB565:
> +		format |= BIT_DPU_LAY_FORMAT_RGB565;
> +		break;
> +	case DRM_FORMAT_NV12:
> +		/* 2-Lane: Yuv420 */
> +		format |= BIT_DPU_LAY_FORMAT_YUV420_2PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_NO_SWITCH;
> +		break;
> +	case DRM_FORMAT_NV21:
> +		/* 2-Lane: Yuv420 */
> +		format |= BIT_DPU_LAY_FORMAT_YUV420_2PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		break;
> +	case DRM_FORMAT_NV16:
> +		/* 2-Lane: Yuv422 */
> +		format |= BIT_DPU_LAY_FORMAT_YUV422_2PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B3B2B1B0;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		break;
> +	case DRM_FORMAT_NV61:
> +		/* 2-Lane: Yuv422 */
> +		format |= BIT_DPU_LAY_FORMAT_YUV422_2PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_NO_SWITCH;
> +		break;
> +	case DRM_FORMAT_YUV420:
> +		format |= BIT_DPU_LAY_FORMAT_YUV420_3PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_NO_SWITCH;
> +		break;
> +	case DRM_FORMAT_YVU420:
> +		format |= BIT_DPU_LAY_FORMAT_YUV420_3PLANE;
> +		/* Y endian */
> +		format |= BIT_DPU_LAY_DATA_ENDIAN_B0B1B2B3;
> +		/* UV endian */
> +		format |= BIT_DPU_LAY_RB_OR_UV_SWITCH;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return format;
> +}
> +
> +static u32 drm_rotation_to_dpu(struct drm_plane_state *state)
> +{
> +	u32 rotation = 0;
> +
> +	switch (state->rotation) {
> +	default:
> +	case DRM_MODE_ROTATE_0:
> +		rotation = BIT_DPU_LAY_ROTATION_0;
> +		break;
> +	case DRM_MODE_ROTATE_90:
> +		rotation = BIT_DPU_LAY_ROTATION_90;
> +		break;
> +	case DRM_MODE_ROTATE_180:
> +		rotation = BIT_DPU_LAY_ROTATION_180;
> +		break;
> +	case DRM_MODE_ROTATE_270:
> +		rotation = BIT_DPU_LAY_ROTATION_270;
> +		break;
> +	case DRM_MODE_REFLECT_Y:
> +		rotation = BIT_DPU_LAY_ROTATION_180_M;
> +		break;
> +	case (DRM_MODE_REFLECT_Y | DRM_MODE_ROTATE_90):
> +		rotation = BIT_DPU_LAY_ROTATION_90_M;
> +		break;
> +	case DRM_MODE_REFLECT_X:
> +		rotation = BIT_DPU_LAY_ROTATION_0_M;
> +		break;
> +	case (DRM_MODE_REFLECT_X | DRM_MODE_ROTATE_90):
> +		rotation = BIT_DPU_LAY_ROTATION_270_M;
> +		break;
> +	}
> +
> +	return rotation;
> +}
> +
> +static u32 drm_blend_to_dpu(struct drm_plane_state *state)
> +{
> +	u32 blend = 0;
> +
> +	switch (state->pixel_blend_mode) {
> +	case DRM_MODE_BLEND_COVERAGE:
> +		/* alpha mode select - combo alpha */
> +		blend |= BIT_DPU_LAY_COMBO_ALPHA;
> +		/* Normal mode */
> +		blend |= BIT_DPU_LAY_MODE_BLEND_NORMAL;
> +		break;
> +	case DRM_MODE_BLEND_PREMULTI:
> +		/* alpha mode select - combo alpha */
> +		blend |= BIT_DPU_LAY_COMBO_ALPHA;
> +		/* Pre-mult mode */
> +		blend |= BIT_DPU_LAY_MODE_BLEND_PREMULT;
> +		break;
> +	case DRM_MODE_BLEND_PIXEL_NONE:
> +	default:
> +		/* don't do blending, maybe RGBX */
> +		/* alpha mode select - layer alpha */
> +		blend |= BIT_DPU_LAY_LAYER_ALPHA;
> +		break;
> +	}
> +
> +	return blend;
> +}
> +
> +static void sprd_dpu_layer(struct sprd_dpu *dpu, struct drm_plane_state *state)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	struct drm_gem_cma_object *cma_obj;
> +	struct drm_framebuffer *fb = state->fb;
> +	u32 addr, size, offset, pitch, blend, format, rotation;
> +	u32 src_x = state->src_x >> 16;
> +	u32 src_y = state->src_y >> 16;
> +	u32 src_w = state->src_w >> 16;
> +	u32 src_h = state->src_h >> 16;
> +	u32 dst_x = state->crtc_x;
> +	u32 dst_y = state->crtc_y;
> +	u32 alpha = state->alpha;
> +	u32 index = state->zpos;
> +	int i;
> +
> +	offset = (dst_x & 0xffff) | (dst_y << 16);
> +	size = (src_w & 0xffff) | (src_h << 16);
> +
> +	for (i = 0; i < fb->format->num_planes; i++) {
> +		cma_obj = drm_fb_cma_get_gem_obj(fb, i);
> +		addr = cma_obj->paddr + fb->offsets[i];
> +
> +		if (i == 0)
> +			layer_reg_wr(ctx, REG_LAY_BASE_ADDR0, addr, index);
> +		else if (i == 1)
> +			layer_reg_wr(ctx, REG_LAY_BASE_ADDR1, addr, index);
> +		else
> +			layer_reg_wr(ctx, REG_LAY_BASE_ADDR2, addr, index);
> +	}
> +
> +	if (fb->format->num_planes == 3) {
> +		/* UV pitch is 1/2 of Y pitch */
> +		pitch = (fb->pitches[0] / fb->format->cpp[0]) |
> +				(fb->pitches[0] / fb->format->cpp[0] << 15);
> +	} else {
> +		pitch = fb->pitches[0] / fb->format->cpp[0];
> +	}
> +
> +	layer_reg_wr(ctx, REG_LAY_POS, offset, index);
> +	layer_reg_wr(ctx, REG_LAY_SIZE, size, index);
> +	layer_reg_wr(ctx, REG_LAY_CROP_START,
> +			src_y << 16 | src_x, index);
> +	layer_reg_wr(ctx, REG_LAY_ALPHA, alpha, index);
> +	layer_reg_wr(ctx, REG_LAY_PITCH, pitch, index);
> +
> +	format = drm_format_to_dpu(fb);
> +	blend = drm_blend_to_dpu(state);
> +	rotation = drm_rotation_to_dpu(state);
> +
> +	layer_reg_wr(ctx, REG_LAY_CTRL, BIT_DPU_LAY_EN |
> +				format |
> +				blend |
> +				rotation,
> +				index);
> +}
> +
> +static void sprd_dpu_flip(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	u32 reg_val;
> +
> +	/*
> +	 * Make sure the dpu is in stop status. DPU has no shadow
> +	 * registers in EDPI mode. So the config registers can only be
> +	 * updated in the rising edge of DPU_RUN bit.
> +	 */
> +	if (ctx->if_type == SPRD_DPU_IF_EDPI)
> +		dpu_wait_stop_done(dpu);
> +
> +	/* update trigger and wait */
> +	if (ctx->if_type == SPRD_DPU_IF_DPI) {
> +		if (!ctx->stopped) {
> +			dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_REG_UPDATE);
> +			dpu_wait_update_done(dpu);
> +		}
> +
> +		dpu_reg_set(ctx, REG_DPU_INT_EN, BIT_DPU_INT_ERR);
> +	} else if (ctx->if_type == SPRD_DPU_IF_EDPI) {
> +		dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_RUN);
> +
> +		ctx->stopped = false;
> +	}
> +
> +	/*
> +	 * If the following interrupt was disabled in isr,
> +	 * re-enable it.
> +	 */
> +	reg_val = BIT_DPU_INT_MMU_VAOR_RD |
> +		  BIT_DPU_INT_MMU_VAOR_WR |
> +		  BIT_DPU_INT_MMU_INV_RD |
> +		  BIT_DPU_INT_MMU_INV_WR;
> +	dpu_reg_set(ctx, REG_DPU_INT_EN, reg_val);
> +}
> +
> +static void sprd_dpu_init(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	u32 int_mask = 0;
> +
> +	writel(0x00, ctx->base + REG_BG_COLOR);
> +	writel(0x00, ctx->base + REG_MMU_EN);
> +	writel(0x00, ctx->base + REG_MMU_PPN1);
> +	writel(0xffff, ctx->base + REG_MMU_RANGE1);
> +	writel(0x00, ctx->base + REG_MMU_PPN2);
> +	writel(0xffff, ctx->base + REG_MMU_RANGE2);
> +	writel(0x1ffff, ctx->base + REG_MMU_VPN_RANGE);
> +
> +	if (ctx->if_type == SPRD_DPU_IF_DPI) {
> +		/* use dpi as interface */
> +		dpu_reg_clr(ctx, REG_DPU_CFG0, BIT_DPU_IF_EDPI);
> +		/* disable Halt function for SPRD DSI */
> +		dpu_reg_clr(ctx, REG_DPI_CTRL, BIT_DPU_DPI_HALT_EN);
> +		/* select te from external pad */
> +		dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_FROM_EXTERNAL_PAD);
> +
> +		/* enable dpu update done INT */
> +		int_mask |= BIT_DPU_INT_UPDATE_DONE;
> +		/* enable dpu done INT */
> +		int_mask |= BIT_DPU_INT_DONE;
> +		/* enable dpu dpi vsync */
> +		int_mask |= BIT_DPU_INT_VSYNC;
> +		/* enable dpu TE INT */
> +		int_mask |= BIT_DPU_INT_TE;
> +		/* enable underflow err INT */
> +		int_mask |= BIT_DPU_INT_ERR;
> +	} else if (ctx->if_type == SPRD_DPU_IF_EDPI) {
> +		/* use edpi as interface */
> +		dpu_reg_set(ctx, REG_DPU_CFG0, BIT_DPU_IF_EDPI);
> +		/* use external te */
> +		dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_FROM_EXTERNAL_PAD);
> +		/* enable te */
> +		dpu_reg_set(ctx, REG_DPI_CTRL, BIT_DPU_EDPI_TE_EN);
> +
> +		/* enable stop done INT */
> +		int_mask |= BIT_DPU_INT_DONE;
> +		/* enable TE INT */
> +		int_mask |= BIT_DPU_INT_TE;
> +	}
> +
> +	/* enable iommu va out of range read error INT */
> +	int_mask |= BIT_DPU_INT_MMU_VAOR_RD;
> +	/* enable iommu va out of range write error INT */
> +	int_mask |= BIT_DPU_INT_MMU_VAOR_WR;
> +	/* enable iommu invalid read error INT */
> +	int_mask |= BIT_DPU_INT_MMU_INV_RD;
> +	/* enable iommu invalid write error INT */
> +	int_mask |= BIT_DPU_INT_MMU_INV_WR;
> +
> +	writel(int_mask, ctx->base + REG_DPU_INT_EN);
> +}
> +
> +static void sprd_dpu_fini(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +
> +	writel(0x00, ctx->base + REG_DPU_INT_EN);
> +	writel(0xff, ctx->base + REG_DPU_INT_CLR);
> +}
> +
> +static void sprd_dpi_init(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +	u32 reg_val;
> +	u32 size;
> +
> +	size = (ctx->vm.vactive << 16) | ctx->vm.hactive;
> +	writel(size, ctx->base + REG_PANEL_SIZE);
> +	writel(size, ctx->base + REG_BLEND_SIZE);
> +
> +	if (ctx->if_type == SPRD_DPU_IF_DPI) {
> +		/* set dpi timing */
> +		reg_val = ctx->vm.hsync_len << 0 |
> +			  ctx->vm.hback_porch << 8 |
> +			  ctx->vm.hfront_porch << 20;
> +		writel(reg_val, ctx->base + REG_DPI_H_TIMING);
> +
> +		reg_val = ctx->vm.vsync_len << 0 |
> +			  ctx->vm.vback_porch << 8 |
> +			  ctx->vm.vfront_porch << 20;
> +		writel(reg_val, ctx->base + REG_DPI_V_TIMING);
> +	}
> +}
> +
> +void sprd_dpu_run(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +
> +	dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_RUN);
> +
> +	ctx->stopped = false;
> +}
> +
> +void sprd_dpu_stop(struct sprd_dpu *dpu)
> +{
> +	struct dpu_context *ctx = &dpu->ctx;
> +
> +	if (ctx->if_type == SPRD_DPU_IF_DPI)
> +		dpu_reg_set(ctx, REG_DPU_CTRL, BIT_DPU_STOP);
> +
> +	dpu_wait_stop_done(dpu);
> +}
> +
> +static int sprd_plane_atomic_check(struct drm_plane *plane,
> +				  struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state,
> +									     plane);
> +	struct drm_crtc_state *crtc_state;
> +	u32 fmt;
> +
> +	if (!plane_state->fb || !plane_state->crtc)
> +		return 0;
> +
> +	fmt = drm_format_to_dpu(plane_state->fb);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	crtc_state = drm_atomic_get_crtc_state(plane_state->state, plane_state->crtc);
> +	if (IS_ERR(crtc_state))
> +		return PTR_ERR(crtc_state);
> +
> +	return drm_atomic_helper_check_plane_state(plane_state, crtc_state,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  true, true);
> +}
> +
> +static void sprd_plane_atomic_update(struct drm_plane *drm_plane,
> +				    struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
> +									   drm_plane);
> +	struct sprd_dpu *dpu = to_sprd_crtc(new_state->crtc);
> +
> +	/* start configure dpu layers */
> +	sprd_dpu_layer(dpu, new_state);
> +}
> +
> +static void sprd_plane_atomic_disable(struct drm_plane *drm_plane,
> +				     struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
> +									   drm_plane);
> +	struct sprd_dpu *dpu = to_sprd_crtc(old_state->crtc);
> +
> +	layer_reg_wr(&dpu->ctx, REG_LAY_CTRL, 0x00, old_state->zpos);
> +}
> +
> +static void sprd_plane_create_properties(struct sprd_plane *plane, int index)
> +{
> +	unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
> +				       BIT(DRM_MODE_BLEND_PREMULTI) |
> +				       BIT(DRM_MODE_BLEND_COVERAGE);
> +
> +	/* create rotation property */
> +	drm_plane_create_rotation_property(&plane->base,
> +					   DRM_MODE_ROTATE_0,
> +					   DRM_MODE_ROTATE_MASK |
> +					   DRM_MODE_REFLECT_MASK);
> +
> +	/* create alpha property */
> +	drm_plane_create_alpha_property(&plane->base);
> +
> +	/* create blend mode property */
> +	drm_plane_create_blend_mode_property(&plane->base, supported_modes);
> +
> +	/* create zpos property */
> +	drm_plane_create_zpos_immutable_property(&plane->base, index);
> +}
> +
> +static const struct drm_plane_helper_funcs sprd_plane_helper_funcs = {
> +	.atomic_check = sprd_plane_atomic_check,
> +	.atomic_update = sprd_plane_atomic_update,
> +	.atomic_disable = sprd_plane_atomic_disable,
> +};
> +
> +static const struct drm_plane_funcs sprd_plane_funcs = {
> +	.update_plane = drm_atomic_helper_update_plane,
> +	.disable_plane	= drm_atomic_helper_disable_plane,
> +	.destroy = drm_plane_cleanup,
> +	.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 struct sprd_plane *sprd_planes_init(struct drm_device *drm)
> +{
> +	struct sprd_plane *plane, *primary;
> +	enum drm_plane_type plane_type;
> +	int i;
> +
> +	for (i = 0; i < 6; i++) {
> +		plane_type = (i == 0) ? DRM_PLANE_TYPE_PRIMARY :
> +					DRM_PLANE_TYPE_OVERLAY;
> +
> +		plane = drmm_universal_plane_alloc(drm, struct sprd_plane, base,
> +					       1, &sprd_plane_funcs,
> +					       layer_fmts, ARRAY_SIZE(layer_fmts),
> +					       NULL, plane_type, NULL);
> +		if (IS_ERR(plane)) {
> +			drm_err(drm, "failed to init drm plane: %d\n", i);
> +			return plane;
> +		}
> +
> +		drm_plane_helper_add(&plane->base, &sprd_plane_helper_funcs);
> +
> +		sprd_plane_create_properties(plane, i);
> +
> +		if (i == 0)
> +			primary = plane;
> +	}
> +
> +	return primary;
> +}
> +
> +static void sprd_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> +	struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> +
> +	drm_display_mode_to_videomode(mode, &dpu->ctx.vm);

You don't need to store the videomode into you dpu structure, just pass
adjusted_mode to sprd_dpi_init.

> +	sprd_dpi_init(dpu);
> +}
> +
> +static void sprd_crtc_atomic_enable(struct drm_crtc *crtc,
> +				   struct drm_atomic_state *state)
> +{
> +	struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +
> +	sprd_dpu_init(dpu);

Do you need to do it on both mode_set_nofb and atomic_enable?

Maxime

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