[PATCH v11 5/5] drm/i915/display: Indexed 8bit format does not support async flip

[Ville Syrjälä]

On Fri, Mar 28, 2025 at 09:26:24PM +0530, Arun R Murthy wrote:
> Async flip is not supported with Indexed 8 bit format as it depends on
> LUT and can't be updated atomically.

We should again highlight that this may change the alignment for
C8 framebuffers on some platforms.

> 
> Signed-off-by: Arun R Murthy <arun.r.murthy at intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic_plane.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> index 3b9d3e1620cd882b8a7f9b4c96640e42367248bb..1bcfa5f4fd63442b632655ccaf325a87be78fe21 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> @@ -177,7 +177,8 @@ bool intel_plane_needs_physical(struct intel_plane *plane)
>  bool intel_plane_can_async_flip(struct intel_plane *plane, u32 format,
>  				u64 modifier)
>  {
> -	if (intel_format_info_is_yuv_semiplanar(drm_format_info(format), modifier))
> +	if (intel_format_info_is_yuv_semiplanar(drm_format_info(format), modifier) ||
> +	    format == DRM_FORMAT_C8)
>  		return false;
>  
>  	return plane->can_async_flip && plane->can_async_flip(modifier);
> 
> -- 
> 2.25.1

-- 
Ville Syrjälä
Intel