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Subject[PATCH v4 4/6] drm/sprd: add Unisoc's drm display controller driver
Date
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@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>

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 funtion.
---
drivers/gpu/drm/sprd/Kconfig | 1 +
drivers/gpu/drm/sprd/Makefile | 4 +-
drivers/gpu/drm/sprd/sprd_dpu.c | 964 ++++++++++++++++++++++++++++++++
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, 1079 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 6e80cc9f3..9b4ef9aea 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 86d95d93a..6c25bfa99 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 000000000..75b7e40d9
--- /dev/null
+++ b/drivers/gpu/drm/sprd/sprd_dpu.c
@@ -0,0 +1,964 @@
+// 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)
+#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 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 base;
+ u32 index;
+};
+
+static inline struct sprd_plane *to_sprd_plane(struct drm_plane *plane)
+{
+ return container_of(plane, struct sprd_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%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;
+}
+
+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 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,
+ 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 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 *drm_plane,
+ struct drm_plane_state *old_state)
+{
+ struct drm_plane_state *state = drm_plane->state;
+ struct sprd_plane *plane = to_sprd_plane(drm_plane);
+ struct sprd_dpu *dpu = to_sprd_crtc(state->crtc);
+
+ /* start configure dpu layers */
+ sprd_dpu_layer(dpu, plane, state);
+}
+
+static void sprd_plane_atomic_disable(struct drm_plane *drm_plane,
+ struct drm_plane_state *old_state)
+{
+ struct sprd_plane *plane = to_sprd_plane(drm_plane);
+ struct sprd_dpu *dpu = to_sprd_crtc(old_state->crtc);
+
+ layer_reg_wr(&dpu->ctx, REG_LAY_CTRL, 0x00, plane->index);
+}
+
+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_plane_init(struct drm_device *drm)
+{
+ struct sprd_plane *plane, *primary;
+ int i;
+
+ for (i = 0; i < 6; i++) {
+ plane = drmm_universal_plane_alloc(drm, struct sprd_plane, base,
+ 1, &sprd_plane_funcs,
+ primary_fmts, ARRAY_SIZE(primary_fmts),
+ NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (IS_ERR(plane)) {
+ drm_err(drm, "fail to init primary plane\n");
+ return plane;
+ }
+
+ drm_plane_helper_add(&plane->base, &sprd_plane_helper_funcs);
+
+ sprd_plane_create_properties(plane, i);
+
+ plane->index = i;
+ if (i == 0)
+ primary = 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_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 int sprd_crtc_atomic_check(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ drm_dbg(crtc->dev, "%s()\n", __func__);
+
+ return 0;
+}
+
+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_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 struct sprd_dpu *sprd_crtc_init(struct drm_device *drm,
+ struct drm_plane *primary)
+{
+ struct device_node *port;
+ struct sprd_dpu *dpu;
+
+ /*
+ * 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 ERR_PTR(-EINVAL);
+ }
+ of_node_put(port);
+
+ 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;
+ }
+
+ dpu->base.port = port;
+ drm_crtc_helper_add(&dpu->base, &sprd_crtc_helper_funcs);
+
+ 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_plane_init(drm);
+ if (IS_ERR(plane))
+ return PTR_ERR(plane);
+
+ dpu = sprd_crtc_init(drm, &plane->base);
+ 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 */ },
+};
+
+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@unisoc.com>");
+MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
+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 a1d3ed655..c626c6caf 100644
--- a/drivers/gpu/drm/sprd/sprd_drm.c
+++ b/drivers/gpu/drm/sprd/sprd_drm.c
@@ -191,6 +191,7 @@ 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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