Re: [PATCH v5 4/6] drm/sprd: add Unisoc's drm display controller driver

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On Sun, 25 Apr 2021 at 20:36, Kevin Tang <kevin3.tang@xxxxxxxxx> 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.
>
> Cc: Orson Zhai <orsonzhai@xxxxxxxxx>
> Cc: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
> Signed-off-by: Kevin Tang <kevin.tang@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/sprd/Kconfig    |   1 +
>  drivers/gpu/drm/sprd/Makefile   |   3 +-
>  drivers/gpu/drm/sprd/sprd_dpu.c | 939 ++++++++++++++++++++++++++++++++
>  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, 1054 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..e74c3dbb3
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.c
> @@ -0,0 +1,939 @@
> +// 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;
> +}
> +
> +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;
> +       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;
> +       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);
> +       }
> +
> +       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, 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 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);
> +
> +               /* 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_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;
> +
> +       if (mode->type & DRM_MODE_TYPE_PREFERRED)
> +               drm_display_mode_to_videomode(mode, &dpu->ctx.vm);
> +}
> +
> +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);
> +
> +       sprd_dpi_init(dpu);
> +
> +       enable_irq(dpu->ctx.irq);
> +
> +       drm_crtc_vblank_on(&dpu->base);
> +}
> +
> +static void sprd_crtc_atomic_disable(struct drm_crtc *crtc,
> +                                   struct drm_atomic_state *state)
> +{
> +       struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +       struct drm_device *drm = dpu->base.dev;
> +
> +       drm_crtc_vblank_off(&dpu->base);
> +
> +       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 void sprd_crtc_atomic_flush(struct drm_crtc *crtc,
> +                                 struct drm_atomic_state *state)
> +
> +{
> +       struct sprd_dpu *dpu = to_sprd_crtc(crtc);
> +       struct drm_device *drm = dpu->base.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_set_nofb  = sprd_crtc_mode_set_nofb,
> +       .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 struct sprd_dpu *sprd_crtc_init(struct drm_device *drm,
> +                        struct drm_plane *primary, struct device *dev)
> +{
> +       struct device_node *port;
> +       struct sprd_dpu *dpu;
> +
> +       dpu = drmm_crtc_alloc_with_planes(drm, struct sprd_dpu, base,
> +                                       primary, NULL,
> +                                       &sprd_crtc_funcs, NULL);
> +       if (IS_ERR(dpu)) {
> +               drm_err(drm, "failed to init crtc\n");
> +               return dpu;
> +       }
> +       drm_crtc_helper_add(&dpu->base, &sprd_crtc_helper_funcs);
> +
> +       /*
> +        * set crtc port so that drm_of_find_possible_crtcs call works
> +        */
> +       port = of_graph_get_port_by_id(dev->of_node, 0);
> +       if (!port) {
> +               drm_err(drm, "failed to found crtc output port for %s\n",
> +                         dev->of_node->full_name);
> +               return ERR_PTR(-EINVAL);
> +       }
> +       dpu->base.port = port;
> +       of_node_put(port);
> +
> +       return dpu;
> +}
> +
> +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->base);
> +
> +       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_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 int sprd_dpu_bind(struct device *dev, struct device *master, void *data)
> +{
> +       struct drm_device *drm = data;
> +       struct sprd_dpu *dpu;
> +       struct sprd_plane *plane;
> +       int ret;
> +
> +       plane = sprd_planes_init(drm);
> +       if (IS_ERR(plane))
> +               return PTR_ERR(plane);
> +
> +       dpu = sprd_crtc_init(drm, &plane->base, dev);
> +       if (IS_ERR(dpu))
> +               return PTR_ERR(dpu);
> +
> +       dpu->drm = drm;
> +       dev_set_drvdata(dev, dpu);
> +
> +       ret = sprd_dpu_context_init(dpu, dev);
> +       if (ret)
> +               return ret;
> +
> +       return 0;
> +}
> +
> +static const struct component_ops dpu_component_ops = {
> +       .bind = sprd_dpu_bind,
> +};
> +
> +static const struct of_device_id dpu_match_table[] = {
> +       { .compatible = "sprd,sharkl3-dpu" },
> +       { /* sentinel */ },
> +};

Should add MODULE_DEVICE_TABLE(of, dpu_match_table);

> +
> +static int sprd_dpu_probe(struct platform_device *pdev)
> +{
> +       return component_add(&pdev->dev, &dpu_component_ops);
> +}
> +
> +static int sprd_dpu_remove(struct platform_device *pdev)
> +{
> +       component_del(&pdev->dev, &dpu_component_ops);
> +
> +       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 000000000..157a78f24
> --- /dev/null
> +++ b/drivers/gpu/drm/sprd/sprd_dpu.h
> @@ -0,0 +1,109 @@
> +/* 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_DPI,
> +       SPRD_DPU_IF_EDPI,
> +       SPRD_DPU_IF_LIMIT
> +};
> +
> +/**
> + * 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: crtc object
> + * @drm: A point to drm device
> + * @ctx: DPU's implementation specific context object
> + */
> +struct sprd_dpu {
> +       struct drm_crtc base;
> +       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, base);
> +}
> +
> +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 6b00a6f27..549b71278 100644
> --- a/drivers/gpu/drm/sprd/sprd_drm.c
> +++ b/drivers/gpu/drm/sprd/sprd_drm.c
> @@ -182,6 +182,7 @@ 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 9781fd591..85d4a8b9f 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_ */
> --
> 2.29.0
>



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