[PATCH v3 13/14] drm/mediatek: Support DRM plane alpha in OVL

[Jason-JH Lin (林睿祥)]

> > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > @@ -102,12 +102,9 @@ static inline bool is_10bit_rgb(u32 fmt)
> >   }
> > 
> >   static const u32 mt8173_formats[] = {
> > -       DRM_FORMAT_XRGB8888,
> >          DRM_FORMAT_ARGB8888,
> > -       DRM_FORMAT_BGRX8888,
> >          DRM_FORMAT_BGRA8888,
> >          DRM_FORMAT_ABGR8888,
> > -       DRM_FORMAT_XBGR8888,
> >          DRM_FORMAT_RGB888,
> >          DRM_FORMAT_BGR888,
> >          DRM_FORMAT_RGB565,
> 
> This is what I get on MT6735:
> 
> [    1.729467] mediatek-drm mediatek-drm.1.auto: [drm] bpp/depth
> value 
> of 32/24 not supported
> [    1.737777] mediatek-drm mediatek-drm.1.auto: [drm] No compatible 
> format found
> [    1.745943] mediatek-drm mediatek-drm.1.auto: [drm] *ERROR* 
> fbdev-dma: Failed to setup generic emulation (ret=-22)
> 

Hi Adam, Yassine,

Please try the patches below and check if they can fix the downgrade
issue:
[1] Fix degradation problem of alpha blending series
- 
https://patchwork.kernel.org/project/linux-mediatek/list/?series=893634
[2] drm/mediatek: Fix XRGB format breakage for blend_modes unsupported
SoCs
- 
https://patchwork.kernel.org/project/linux-mediatek/patch/20241005095234.12925-1-jason-jh.lin@mediatek.com/

Regards,
Jason-JH.Lin

> > 
> > Regards,
> > Jason-JH.Lin
> > 
> >>
> >> - Adam Thiede
>