<html><body><p>
<pre>
Hi, Shawn:
On Sun, 2024-06-16 at 16:29 +0800, Hsiao Chien Sung via B4 Relay wrote:
>
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> From: Hsiao Chien Sung <shawn.sung@mediatek.com>
>
> 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.
Reviewed-by: CK Hu <ck.hu@mediatek.com>
>
> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
> ---
> 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 738244a6164e..615b75919d1b 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 +429,7 @@ 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,
>
> --
> Git-146)
>
>
</pre>
</p></body></html><!--type:text--><!--{--><pre>************* MEDIATEK Confidentiality Notice ********************
The information contained in this e-mail message (including any
attachments) may be confidential, proprietary, privileged, or otherwise
exempt from disclosure under applicable laws. It is intended to be
conveyed only to the designated recipient(s). Any use, dissemination,
distribution, printing, retaining or copying of this e-mail (including its
attachments) by unintended recipient(s) is strictly prohibited and may
be unlawful. If you are not an intended recipient of this e-mail, or believe
that you have received this e-mail in error, please notify the sender
immediately (by replying to this e-mail), delete any and all copies of
this e-mail (including any attachments) from your system, and do not
disclose the content of this e-mail to any other person. Thank you!
</pre><!--}-->