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

From: Kevin Tang
Date: Fri Apr 30 2021 - 08:20:44 EST

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Cc Robin & Joerg

Maxime Ripard <maxime@xxxxxxxxxx> 于2021年4月30日周五下午5:22写道：

>
> On Sun, Apr 25, 2021 at 08:36:05PM +0800, Kevin Tang wrote:
> > Adds DPU(Display Processor Unit) support for the Unisoc's display
> > subsystem.
> > It's support multi planes, scaler, rotation, PQ(Picture Quality) and more.
> >
> > v2:
> > - Use drm_xxx to replace all DRM_XXX.
> > - Use kzalloc to replace devm_kzalloc for sprd_dpu structure init.
> >
> > v3:
> > - Remove dpu_layer stuff layer and commit layers by aotmic_update
> >
> > v4:
> > - Use drmm_helpers to allocate crtc and planes.
> > - Move rotation enum definitions to crtc layer reg bitfields.
> > - Move allocate crtc and planes to bind function.
> >
> > v5:
> > - Fix the checkpatch warnings.
> > - Use mode_set_nofb instead of mode_valid callback.
> > - Follow the OF-Graph bindings, use of_graph_get_port_by_id
> > instead of of_parse_phandle.
> > - Use zpos to represent the layer position.
> > - Rebase to last drm misc branch.
> >
> > 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;
> > +}
>
> We'll still want an Acked-by from the IOMMU maintainers, please add them in Cc.
>
> > +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);
>
> Here fb->format is the result of 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);
>
> What happens if the mode isn't a preferred mode?
>
> > +}
> > +
> > +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);
>
> I guess that call would fail here or program a bogus value. We already
> discussed this in the previous version, but I'm really not sure why you
> need this in the first place. Just use the crtc_state->adjusted_mode and
> program that.
>
> > + 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;
> > + }
>
> We discussed this in the previous version. You should mask / clear all
> the interrupts before calling request_irq, and then just unmask the
> vblank one in enable/disable_vblank, you don't need those enable_irq /
> disable_irq calls in the rest of your driver.
>
> Maxime

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