[Intel-gfx] [PATCHv3] drm/i915: Support Async Flip on Linear buffers

[Lisovskiy, Stanislav]

On Tue, Sep 06, 2022 at 09:48:06AM +0530, Arun R Murthy wrote:
> Starting from Gen12 Async Flip is supported on linear buffers.
> This patch enables support for async on linear buffer.
> 
> UseCase: In Hybrid graphics, for hardware unsupported pixel formats it
> will be converted to linear memory and then composed.
> 
> v2: Added use case
> v3: Added FIXME for ICL indicating the restrictions
> 
> Signed-off-by: Arun R Murthy <arun.r.murthy at intel.com>

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index be7cff722196..f0d2c3cb3bd5 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -6610,6 +6610,20 @@ static int intel_async_flip_check_hw(struct intel_atomic_state *state, struct in
>  		 * this selectively if required.
>  		 */
>  		switch (new_plane_state->hw.fb->modifier) {
> +		case DRM_FORMAT_MOD_LINEAR:
> +			/*
> +			 * FIXME: Async on Linear buffer is supported on ICL as
> +			 * but with additional alignment and fbc restrictions
> +			 * need to be taken care of. These aren't applicable for
> +			 * gen12+.
> +			 */
> +			if (DISPLAY_VER(i915) < 12) {
> +				drm_dbg_kms(&i915->drm,
> +					    "[PLANE:%d:%s] Modifier does not support async flips\n",
> +					    plane->base.base.id, plane->base.name);
> +				return -EINVAL;
> +			}
> +
>  		case I915_FORMAT_MOD_X_TILED:
>  		case I915_FORMAT_MOD_Y_TILED:
>  		case I915_FORMAT_MOD_Yf_TILED:
> -- 
> 2.25.1
>