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Hi, Shawn:

On Thu, 2024-06-06 at 17:26 +0800, Shawn Sung wrote:
> From: Hsiao Chien Sung <shawn.sung@mediatek.com>
>
> Support "None" alpha blending mode on MediaTek's chips.
>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 738244a6164e..54a6f11aa867 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_SUBBUFBIT(16)
> #define DISP_REG_OVL_PITCH(n)(0x0044 + 0x20 * (n))
> +#define OVL_CONST_BLENDBIT(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_MT27010x0040
> @@ -428,6 +429,8 @@ 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 blend_mode = state->base.pixel_blend_mode;
> +unsigned int ignore_pixel_alpha = 0;
> unsigned int con;
> bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR;
> union overlay_pitch {
> @@ -449,6 +452,15 @@ 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.
> + */

This patch looks good to me, but OVL driver has already declare some X format.
So I would like to separate X format related part to a fix patch.

Regards,
CK

> +if (blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
> + (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 +476,8 @@ 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
>

</pre>
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