From: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
CONST_BLD must be enabled for XRGB formats although the alpha channel
can be ignored, or OVL will still read the value from memory.
This error only affects CRC generation.
Fixes: c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM driver")
Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 946b87ec48ca..fd390fb83d0e 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -38,6 +38,7 @@
#define DISP_REG_OVL_PITCH_MSB(n) (0x0040 + 0x20 * (n))
#define OVL_PITCH_MSB_2ND_SUBBUF BIT(16)
#define DISP_REG_OVL_PITCH(n) (0x0044 + 0x20 * (n))
+#define OVL_CONST_BLEND BIT(28)
#define DISP_REG_OVL_RDMA_CTRL(n) (0x00c0 + 0x20 * (n))
#define DISP_REG_OVL_RDMA_GMC(n) (0x00c8 + 0x20 * (n))
#define DISP_REG_OVL_ADDR_MT2701 0x0040
@@ -428,6 +429,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
unsigned int fmt = pending->format;
unsigned int offset = (pending->y << 16) | pending->x;
unsigned int src_size = (pending->height << 16) | pending->width;
+ unsigned int ignore_pixel_alpha = 0;
unsigned int con;
bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR;
union overlay_pitch {
@@ -449,6 +451,14 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
if (state->base.fb && state->base.fb->format->has_alpha)
con |= OVL_CON_AEN | OVL_CON_ALPHA;
+ /* CONST_BLD must be enabled for XRGB formats although the alpha channel
+ * can be ignored, or OVL will still read the value from memory.
+ * For RGB888 related formats, whether CONST_BLD is enabled or not won't
+ * affect the result. Therefore we use !has_alpha as the condition.
+ */
+ if (state->base.fb && !state->base.fb->format->has_alpha)
+ ignore_pixel_alpha = OVL_CONST_BLEND;
+
if (pending->rotation & DRM_MODE_REFLECT_Y) {
con |= OVL_CON_VIRT_FLIP;
addr += (pending->height - 1) * pending->pitch;
@@ -464,8 +474,8 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
mtk_ddp_write_relaxed(cmdq_pkt, con, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_CON(idx));
- mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb, &ovl->cmdq_reg, ovl->regs,
- DISP_REG_OVL_PITCH(idx));
+ mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb | ignore_pixel_alpha,
+ &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH(idx));
mtk_ddp_write_relaxed(cmdq_pkt, src_size, &ovl->cmdq_reg, ovl->regs,
DISP_REG_OVL_SRC_SIZE(idx));
mtk_ddp_write_relaxed(cmdq_pkt, offset, &ovl->cmdq_reg, ovl->regs,
--
2.18.0
