Robin Murphy <robin.murphy@xxxxxxx> 于2021年2月16日周二 下午10:22写道：
On 2021-01-05 13:46, 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.
>
> Cc: Orson Zhai <orsonzhai@xxxxxxxxx>
> Cc: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
> Signed-off-by: Kevin Tang <kevin.tang@xxxxxxxxxx>
>
> 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
> ---
> drivers/gpu/drm/sprd/Kconfig | 1 +
> drivers/gpu/drm/sprd/Makefile | 4 +-
> drivers/gpu/drm/sprd/sprd_dpu.c | 985 ++++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/sprd/sprd_dpu.h | 120 +++++
> drivers/gpu/drm/sprd/sprd_drm.c | 1 +
> drivers/gpu/drm/sprd/sprd_drm.h | 2 +
> 6 files changed, 1111 insertions(+), 2 deletions(-)
> 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 6e80cc9..9b4ef9a 100644
> --- a/drivers/gpu/drm/sprd/Kconfig
> +++ b/drivers/gpu/drm/sprd/Kconfig
> @@ -3,6 +3,7 @@ config DRM_SPRD
> depends on ARCH_SPRD || COMPILE_TEST
> depends on DRM && OF
> select DRM_KMS_HELPER
> + select VIDEOMODE_HELPERS
> select DRM_GEM_CMA_HELPER
> select DRM_KMS_CMA_HELPER
> select DRM_MIPI_DSI
> diff --git a/drivers/gpu/drm/sprd/Makefile b/drivers/gpu/drm/sprd/Makefile
> index 86d95d9..6c25bfa 100644
> --- a/drivers/gpu/drm/sprd/Makefile
> +++ b/drivers/gpu/drm/sprd/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
>
> -subdir-ccflags-y += -I$(srctree)/$(src)
> +obj-y := sprd_drm.o \
> + sprd_dpu.o
>
> -obj-y := sprd_drm.o
> diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
> new file mode 100644
> index 0000000..d562d44
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.c
> @@ -0,0 +1,985 @@
> +// 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_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)
> +
> +/* 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 primary_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 plane;
> + u32 index;
> +};
> +
> +static inline struct sprd_plane *to_sprd_plane(struct drm_plane *plane)
> +{
> + return container_of(plane, struct sprd_plane, plane);
> +}
> +
> +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%08x 0x%08x 0x%08x ctrl: 0x%08x\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;
> +}
Please don't do this - if the IOMMU is managed by a separate driver,
that driver should handle its own interrupts. If you want to report
client-specific information associated with a fault you can use
iommu_set_fault_handler() to hook in your reporting function (the IOMMU
driver should correspondingly call report_iommu_fault() from its own
fault handler).
Even regardless of the mess this seems to be responsible for in terms of
DT bindings and resource claiming, duplicating the basic IOMMU fault
processing across all the drivers for your media blocks is clearly not a
good path to take.
Robin.
Hi Robin,
First of all, thank you very much for your comment.
Our iommu driver is indeed an separate driver, and also in upstreaming,
but iommu fault interrupts reporting by display controller, not iommu itself,
if use iommu_set_fault_handler() to hook in our reporting function, there
must be cross-module access to h/w registers.
Our media blocks all have separate iommu fault register and interrupt,
it looks like can't report client-specific information associated with a fault by report_iommu_fault().
> +
> +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;
> +
> + switch (state->rotation) {
> + default:
> + case DRM_MODE_ROTATE_0:
> + rotation = DPU_LAYER_ROTATION_0;
> + break;
> + case DRM_MODE_ROTATE_90:
> + rotation = DPU_LAYER_ROTATION_90;
> + break;
> + case DRM_MODE_ROTATE_180:
> + rotation = DPU_LAYER_ROTATION_180;
> + break;
> + case DRM_MODE_ROTATE_270:
> + rotation = DPU_LAYER_ROTATION_270;
> + break;
> + case DRM_MODE_REFLECT_Y:
> + rotation = DPU_LAYER_ROTATION_180_M;
> + break;
> + case (DRM_MODE_REFLECT_Y | DRM_MODE_ROTATE_90):
> + rotation = DPU_LAYER_ROTATION_90_M;
> + break;
> + case DRM_MODE_REFLECT_X:
> + rotation = DPU_LAYER_ROTATION_0_M;
> + break;
> + case (DRM_MODE_REFLECT_X | DRM_MODE_ROTATE_90):
> + rotation = DPU_LAYER_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 sprd_plane *plane,
> + struct drm_plane_state *state)
> +{
> + struct dpu_context *ctx = &dpu->ctx;
> + struct drm_gem_cma_object *cma_obj;
> + const struct drm_format_info *info;
> + 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;
> + 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, plane->index);
> + else if (i == 1)
> + layer_reg_wr(ctx, REG_LAY_BASE_ADDR1, addr, plane->index);
> + else
> + layer_reg_wr(ctx, REG_LAY_BASE_ADDR2, addr, plane->index);
> + }
> +
> + info = drm_format_info(fb->format->format);
> + if (fb->format->num_planes == 3) {
> + /* UV pitch is 1/2 of Y pitch */
> + pitch = (fb->pitches[0] / info->cpp[0]) |
> + (fb->pitches[0] / info->cpp[0] << 15);
> + } else {
> + pitch = fb->pitches[0] / info->cpp[0];
> + }
> +
> + layer_reg_wr(ctx, REG_LAY_POS, offset, plane->index);
> + layer_reg_wr(ctx, REG_LAY_SIZE, size, plane->index);
> + layer_reg_wr(ctx, REG_LAY_CROP_START,
> + src_y << 16 | src_x, plane->index);
> + layer_reg_wr(ctx, REG_LAY_ALPHA, alpha, plane->index);
> + layer_reg_wr(ctx, REG_LAY_PITCH, pitch, plane->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 << 20,
> + plane->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 reg_val, size;
> +
> + writel(0x00, ctx->base + REG_BG_COLOR);
> +
> + size = (ctx->vm.vactive << 16) | ctx->vm.hactive;
> + writel(size, ctx->base + REG_PANEL_SIZE);
> + writel(size, ctx->base + REG_BLEND_SIZE);
> +
> + 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);
> +}
> +
> +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 int_mask = 0;
> + u32 reg_val;
> +
> + 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);
> +
> + /* 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);
> +
> + if (ctx->vm.vsync_len + ctx->vm.vback_porch < 32)
> + drm_warn(dpu->drm, "Warning: (vsync + vbp) < 32, "
> + "underflow risk!\n");
> +
> + /* 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);
> +}
> +
> +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_plane_state *state)
> +{
> + struct drm_framebuffer *fb = state->fb;
> + struct drm_crtc_state *crtc_state;
> + u32 fmt;
> +
> + if (!fb || !state->crtc)
> + return 0;
> +
> + fmt = drm_format_to_dpu(fb);
> + if (!fmt)
> + return -EINVAL;
> +
> + crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> + if (IS_ERR(crtc_state))
> + return PTR_ERR(crtc_state);
> +
> + return drm_atomic_helper_check_plane_state(state, crtc_state,
> + DRM_PLANE_HELPER_NO_SCALING,
> + DRM_PLANE_HELPER_NO_SCALING,
> + true, true);
> +}
> +
> +static void sprd_plane_atomic_update(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct drm_plane_state *state = plane->state;
> + struct sprd_plane *p = to_sprd_plane(plane);
> + struct sprd_dpu *dpu = to_sprd_crtc(state->crtc);
> +
> + /* start configure dpu layers */
> + sprd_dpu_layer(dpu, p, state);
> +}
> +
> +static void sprd_plane_atomic_disable(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct sprd_plane *p = to_sprd_plane(plane);
> + struct sprd_dpu *dpu = to_sprd_crtc(old_state->crtc);
> +
> + layer_reg_wr(&dpu->ctx, REG_LAY_CTRL, 0x00, p->index);
> +}
> +
> +static void sprd_plane_create_properties(struct sprd_plane *p, 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(&p->plane,
> + DRM_MODE_ROTATE_0,
> + DRM_MODE_ROTATE_MASK |
> + DRM_MODE_REFLECT_MASK);
> +
> + /* create alpha property */
> + drm_plane_create_alpha_property(&p->plane);
> +
> + /* create blend mode property */
> + drm_plane_create_blend_mode_property(&p->plane, supported_modes);
> +
> + /* create zpos property */
> + drm_plane_create_zpos_immutable_property(&p->plane, 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 drm_plane *sprd_plane_init(struct drm_device *drm,
> + struct sprd_dpu *dpu)
> +{
> + struct drm_plane *primary = NULL;
> + struct sprd_plane *p = NULL;
> + int ret, i;
> +
> + for (i = 0; i < 6; i++) {
> + p = devm_kzalloc(drm->dev, sizeof(*p), GFP_KERNEL);
> + if (!p)
> + return ERR_PTR(-ENOMEM);
> +
> + ret = drm_universal_plane_init(drm, &p->plane, 1,
> + &sprd_plane_funcs, primary_fmts,
> + ARRAY_SIZE(primary_fmts), NULL,
> + DRM_PLANE_TYPE_PRIMARY, NULL);
> + if (ret) {
> + drm_err(drm, "fail to init primary plane\n");
> + return ERR_PTR(ret);
> + }
> +
> + drm_plane_helper_add(&p->plane, &sprd_plane_helper_funcs);
> +
> + sprd_plane_create_properties(p, i);
> +
> + p->index = i;
> + if (i == 0)
> + primary = &p->plane;
> + }
> +
> + return primary;
> +}
> +
> +static enum drm_mode_status sprd_crtc_mode_valid(struct drm_crtc *crtc,
> + const struct drm_display_mode *mode)
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +
> + drm_dbg(dpu->drm, "%s() mode: "DRM_MODE_FMT"\n", __func__, DRM_MODE_ARG(mode));
> +
> + if (mode->type & DRM_MODE_TYPE_PREFERRED) {
> + drm_display_mode_to_videomode(mode, &dpu->ctx.vm);
> +
> + if ((mode->hdisplay == mode->htotal) ||
> + (mode->vdisplay == mode->vtotal))
> + dpu->ctx.if_type = SPRD_DPU_IF_EDPI;
> + else
> + dpu->ctx.if_type = SPRD_DPU_IF_DPI;
> + }
> +
> + return MODE_OK;
> +}
> +
> +static void sprd_crtc_atomic_enable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_state)
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +
> + sprd_dpu_init(dpu);
> +
> + sprd_dpi_init(dpu);
> +
> + enable_irq(dpu->ctx.irq);
> +
> + drm_crtc_vblank_on(&dpu->crtc);
> +}
> +
> +static void sprd_crtc_atomic_disable(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_state)
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> + struct drm_device *drm = dpu->crtc.dev;
> +
> + drm_crtc_vblank_off(&dpu->crtc);
> +
> + disable_irq(dpu->ctx.irq);
> +
> + sprd_dpu_fini(dpu);
> +
> + spin_lock_irq(&drm->event_lock);
> + if (crtc->state->event) {
> + drm_crtc_send_vblank_event(crtc, crtc->state->event);
> + crtc->state->event = NULL;
> + }
> + spin_unlock_irq(&drm->event_lock);
> +}
> +
> +static int sprd_crtc_atomic_check(struct drm_crtc *crtc,
> + struct drm_crtc_state *state)
> +{
> + drm_dbg(crtc->dev, "%s()\n", __func__);
> +
> + return 0;
> +}
> +
> +static void sprd_crtc_atomic_flush(struct drm_crtc *crtc,
> + struct drm_crtc_state *old_state)
> +
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> + struct drm_device *drm = dpu->crtc.dev;
> +
> + sprd_dpu_flip(dpu);
> +
> + spin_lock_irq(&drm->event_lock);
> + if (crtc->state->event) {
> + drm_crtc_send_vblank_event(crtc, crtc->state->event);
> + crtc->state->event = NULL;
> + }
> + spin_unlock_irq(&drm->event_lock);
> +}
> +
> +static int sprd_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +
> + dpu_reg_set(&dpu->ctx, REG_DPU_INT_EN, BIT_DPU_INT_VSYNC);
> +
> + return 0;
> +}
> +
> +static void sprd_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> + struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +
> + dpu_reg_clr(&dpu->ctx, REG_DPU_INT_EN, BIT_DPU_INT_VSYNC);
> +}
> +
> +static const struct drm_crtc_helper_funcs sprd_crtc_helper_funcs = {
> + .mode_valid = sprd_crtc_mode_valid,
> + .atomic_check = sprd_crtc_atomic_check,
> + .atomic_flush = sprd_crtc_atomic_flush,
> + .atomic_enable = sprd_crtc_atomic_enable,
> + .atomic_disable = sprd_crtc_atomic_disable,
> +};
> +
> +static const struct drm_crtc_funcs sprd_crtc_funcs = {
> + .destroy = drm_crtc_cleanup,
> + .set_config = drm_atomic_helper_set_config,
> + .page_flip = drm_atomic_helper_page_flip,
> + .reset = drm_atomic_helper_crtc_reset,
> + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> + .enable_vblank = sprd_crtc_enable_vblank,
> + .disable_vblank = sprd_crtc_disable_vblank,
> +};
> +
> +static int sprd_crtc_init(struct drm_device *drm, struct drm_crtc *crtc,
> + struct drm_plane *primary)
> +{
> + struct device_node *port;
> + int ret;
> +
> + /*
> + * set crtc port so that drm_of_find_possible_crtcs call works
> + */
> + port = of_parse_phandle(drm->dev->of_node, "ports", 0);
> + if (!port) {
> + drm_err(drm, "find 'ports' phandle of %s failed\n",
> + drm->dev->of_node->full_name);
> + return -EINVAL;
> + }
> + of_node_put(port);
> + crtc->port = port;
> +
> + ret = drm_crtc_init_with_planes(drm, crtc, primary, NULL,
> + &sprd_crtc_funcs, NULL);
> + if (ret) {
> + drm_err(drm, "failed to init crtc.\n");
> + return ret;
> + }
> +
> + drm_crtc_helper_add(crtc, &sprd_crtc_helper_funcs);
> +
> + return 0;
> +}
> +
> +static irqreturn_t sprd_dpu_isr(int irq, void *data)
> +{
> + struct sprd_dpu *dpu = data;
> + struct dpu_context *ctx = &dpu->ctx;
> + u32 reg_val, int_mask = 0;
> +
> + reg_val = readl(ctx->base + REG_DPU_INT_STS);
> +
> + /* disable err interrupt */
> + if (reg_val & BIT_DPU_INT_ERR) {
> + int_mask |= BIT_DPU_INT_ERR;
> + drm_warn(dpu->drm, "Warning: dpu underflow!\n");
> + }
> +
> + /* dpu update done isr */
> + if (reg_val & BIT_DPU_INT_UPDATE_DONE) {
> + ctx->evt_update = true;
> + wake_up_interruptible_all(&ctx->wait_queue);
> + }
> +
> + /* dpu stop done isr */
> + if (reg_val & BIT_DPU_INT_DONE) {
> + ctx->evt_stop = true;
> + wake_up_interruptible_all(&ctx->wait_queue);
> + }
> +
> + if (reg_val & BIT_DPU_INT_VSYNC)
> + drm_crtc_handle_vblank(&dpu->crtc);
> +
> + int_mask |= check_mmu_isr(dpu, reg_val);
> +
> + writel(reg_val, ctx->base + REG_DPU_INT_CLR);
> + dpu_reg_clr(ctx, REG_DPU_INT_EN, int_mask);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int sprd_dpu_bind(struct device *dev, struct device *master, void *data)
> +{
> + struct drm_device *drm = data;
> + struct sprd_dpu *dpu = dev_get_drvdata(dev);
> + struct drm_plane *plane;
> + int ret;
> +
> + plane = sprd_plane_init(drm, dpu);
> + if (IS_ERR_OR_NULL(plane)) {
> + ret = PTR_ERR(plane);
> + return ret;
> + }
> +
> + ret = sprd_crtc_init(drm, &dpu->crtc, plane);
> + if (ret)
> + return ret;
> +
> + dpu->drm = drm;
> +
> + return 0;
> +}
> +
> +static void sprd_dpu_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> + struct sprd_dpu *dpu = dev_get_drvdata(dev);
> +
> + drm_crtc_cleanup(&dpu->crtc);
> +}
> +
> +static const struct component_ops dpu_component_ops = {
> + .bind = sprd_dpu_bind,
> + .unbind = sprd_dpu_unbind,
> +};
> +
> +static int sprd_dpu_context_init(struct sprd_dpu *dpu,
> + struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct dpu_context *ctx = &dpu->ctx;
> + struct resource *res;
> + int ret;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ctx->base = devm_ioremap(dev, res->start, resource_size(res));
> + if (!ctx->base) {
> + dev_err(dev, "failed to map dpu registers\n");
> + return -EFAULT;
> + }
> +
> + ctx->irq = platform_get_irq(pdev, 0);
> + if (ctx->irq < 0) {
> + dev_err(dev, "failed to get dpu irq\n");
> + return ctx->irq;
> + }
> +
> + irq_set_status_flags(ctx->irq, IRQ_NOAUTOEN);
> + ret = devm_request_irq(dev, ctx->irq, sprd_dpu_isr,
> + 0, "DPU", dpu);
> + if (ret) {
> + dev_err(dev, "failed to register dpu irq handler\n");
> + return ret;
> + }
> +
> + init_waitqueue_head(&ctx->wait_queue);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id dpu_match_table[] = {
> + { .compatible = "sprd,sharkl3-dpu" },
> + { /* sentinel */ },
> +};
> +
> +static int sprd_dpu_probe(struct platform_device *pdev)
> +{
> + struct sprd_dpu *dpu;
> + int ret;
> +
> + dpu = kzalloc(sizeof(*dpu), GFP_KERNEL);
> + if (!dpu)
> + return -ENOMEM;
> +
> + ret = sprd_dpu_context_init(dpu, &pdev->dev);
> + if (ret) {
> + kfree(dpu);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, dpu);
> +
> + return component_add(&pdev->dev, &dpu_component_ops);
> +}
> +
> +static int sprd_dpu_remove(struct platform_device *pdev)
> +{
> + struct sprd_dpu *dpu = platform_get_drvdata(pdev);
> +
> + component_del(&pdev->dev, &dpu_component_ops);
> +
> + kfree(dpu);
> + return 0;
> +}
> +
> +struct platform_driver sprd_dpu_driver = {
> + .probe = sprd_dpu_probe,
> + .remove = sprd_dpu_remove,
> + .driver = {
> + .name = "sprd-dpu-drv",
> + .of_match_table = dpu_match_table,
> + },
> +};
> +
> +MODULE_AUTHOR("Leon He <leon.he@xxxxxxxxxx>");
> +MODULE_AUTHOR("Kevin Tang <kevin.tang@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("Unisoc Display Controller Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/sprd/sprd_dpu.h b/drivers/gpu/drm/sprd/sprd_dpu.h
> new file mode 100644
> index 0000000..a937ba1
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.h
> @@ -0,0 +1,120 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020 Unisoc Inc.
> + */
> +
> +#ifndef __SPRD_DPU_H__
> +#define __SPRD_DPU_H__
> +
> +#include <linux/bug.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/string.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_vblank.h>
> +#include <uapi/drm/drm_mode.h>
> +
> +/* DPU Layer registers offset */
> +#define DPU_LAY_REG_OFFSET 0x30
> +
> +enum {
> + SPRD_DPU_IF_DBI = 0,
> + SPRD_DPU_IF_DPI,
> + SPRD_DPU_IF_EDPI,
> + SPRD_DPU_IF_LIMIT
> +};
> +
> +enum {
> + DPU_LAYER_ROTATION_0,
> + DPU_LAYER_ROTATION_90,
> + DPU_LAYER_ROTATION_180,
> + DPU_LAYER_ROTATION_270,
> + DPU_LAYER_ROTATION_0_M,
> + DPU_LAYER_ROTATION_90_M,
> + DPU_LAYER_ROTATION_180_M,
> + DPU_LAYER_ROTATION_270_M,
> +};
> +
> +/**
> + * Sprd DPU context structure
> + *
> + * @base: DPU controller base address
> + * @irq: IRQ number to install the handler for
> + * @if_type: The type of DPI interface, default is DPI mode.
> + * @vm: videomode structure to use for DPU and DPI initialization
> + * @stopped: indicates whether DPU are stopped
> + * @wait_queue: wait queue, used to wait for DPU shadow register update done and
> + * DPU stop register done interrupt signal.
> + * @evt_update: wait queue condition for DPU shadow register
> + * @evt_stop: wait queue condition for DPU stop register
> + */
> +struct dpu_context {
> + void __iomem *base;
> + int irq;
> + u8 if_type;
> + struct videomode vm;
> + bool stopped;
> + wait_queue_head_t wait_queue;
> + bool evt_update;
> + bool evt_stop;
> +};
> +
> +/**
> + * Sprd DPU device structure
> + *
> + * @crtc: DRM crtc
> + * @ctx: A pointer to the DPU's implementation specific context
> + */
> +struct sprd_dpu {
> + struct drm_crtc crtc;
> + struct drm_device *drm;
> + struct dpu_context ctx;
> +};
> +
> +static inline struct sprd_dpu *to_sprd_crtc(struct drm_crtc *crtc)
> +{
> + return container_of(crtc, struct sprd_dpu, crtc);
> +}
> +
> +static inline void
> +dpu_reg_set(struct dpu_context *ctx, u32 offset, u32 set_bits)
> +{
> + u32 bits = readl_relaxed(ctx->base + offset);
> +
> + writel(bits | set_bits, ctx->base + offset);
> +}
> +
> +static inline void
> +dpu_reg_clr(struct dpu_context *ctx, u32 offset, u32 clr_bits)
> +{
> + u32 bits = readl_relaxed(ctx->base + offset);
> +
> + writel(bits & ~clr_bits, ctx->base + offset);
> +}
> +
> +static inline u32
> +layer_reg_rd(struct dpu_context *ctx, u32 offset, int index)
> +{
> + u32 layer_offset = offset + index * DPU_LAY_REG_OFFSET;
> +
> + return readl(ctx->base + layer_offset);
> +}
> +
> +static inline void
> +layer_reg_wr(struct dpu_context *ctx, u32 offset, u32 cfg_bits, int index)
> +{
> + u32 layer_offset = offset + index * DPU_LAY_REG_OFFSET;
> +
> + writel(cfg_bits, ctx->base + layer_offset);
> +}
> +
> +void sprd_dpu_run(struct sprd_dpu *dpu);
> +void sprd_dpu_stop(struct sprd_dpu *dpu);
> +
> +#endif
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
> index ec101de..ca93be2 100644
> --- a/drivers/gpu/drm/sprd/sprd_drm.c
> +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> @@ -196,6 +196,7 @@ static struct platform_driver sprd_drm_driver = {
>
> static struct platform_driver *sprd_drm_drivers[] = {
> &sprd_drm_driver,
> + &sprd_dpu_driver,
> };
>
> static int __init sprd_drm_init(void)
> diff --git a/drivers/gpu/drm/sprd/sprd_drm.h b/drivers/gpu/drm/sprd/sprd_drm.h
> index 9781fd5..85d4a8b 100644
> --- a/drivers/gpu/drm/sprd/sprd_drm.h
> +++ b/drivers/gpu/drm/sprd/sprd_drm.h
> @@ -13,4 +13,6 @@ struct sprd_drm {
> struct drm_device drm;
> };
>
> +extern struct platform_driver sprd_dpu_driver;
> +
> #endif /* _SPRD_DRM_H_ */
>
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