Re: [PATCH 5/6] drm/msm/dpu: Require linear modifier for writeback framebuffers

[Dmitry Baryshkov]

On Fri, Oct 17, 2025 at 07:58:39PM +0000, Vladimir Lypak wrote:
> UBWC-related register configuration for writeback is not implemented in
> the driver yet but there aren't any checks for non-linear modifiers in
> atomic_check. Thus when compressed framebuffer is attached to writeback
> connector it will be filled with linear image data. This patch forbids
> non-linear modifiers for writeback framebuffers until UBWC support for
> writeback is properly implemented.
> 
> Fixes: 71174f362d67 ("drm/msm/dpu: move writeback's atomic_check to dpu_writeback.c")
> Signed-off-by: Vladimir Lypak <vladimir.lypak@xxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 3 +++
>  1 file changed, 3 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry