[PATCH v6 10/14] drm/mediatek: Support "None" alpha blending in OVL

[CK Hu (胡俊光)]

Hi, Shawn:

On Fri, 2024-03-22 at 13:28 +0800, Shawn Sung wrote:
> From: Hsiao Chien Sung <shawn.sung at mediatek.com>
> 
> Support "None" blend mode on MediaTek's chips.
> 
> Please refer to the description of the commit
> "drm/mediatek: Support alpha blending in display driver"
> for more information.

Reviewed-by: CK Hu <ck.hu at mediatek.com>

> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index b1e5d453316cc..a936f338ab79d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -484,7 +484,8 @@ void mtk_ovl_layer_config(struct device *dev,
> unsigned int idx,
>  		con |= state->base.alpha & OVL_CON_ALPHA;
>  	}
>  
> -	if (state->base.fb && !state->base.fb->format->has_alpha)
> +	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) {
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