[Intel-gfx] [PATCH 5/5] drm/i915/display: Workaround cursor left overs with PSR2 selective fetch enabled

[Gwan-gyeong Mun]

Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>

On 9/10/21 2:07 AM, José Roberto de Souza wrote:
> Not sure why but when moving the cursor fast it causes some artifacts
> of the cursor to be left in the cursor path, adding some pixels above
> the cursor to the damaged area fixes the issue, so leaving this as a
> workaround until proper fix is found.
> 
> This is reproducile on TGL and ADL-P.
> 
> Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_psr.c | 25 ++++++++++++++++++++++++
>   1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 670b0ceba110f..18e721dde22e2 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1565,6 +1565,28 @@ static void intel_psr2_sel_fetch_pipe_alignment(const struct intel_crtc_state *c
>   		drm_warn(&dev_priv->drm, "Missing PSR2 sel fetch alignment with DSC\n");
>   }
>   
> +/*
> + * FIXME: Not sure why but when moving the cursor fast it causes some artifacts
> + * of the cursor to be left in the cursor path, adding some pixels above the
> + * cursor to the damaged area fixes the issue.
> + */
> +static void cursor_area_workaround(const struct intel_plane_state *new_plane_state,
> +				   struct drm_rect *damaged_area,
> +				   struct drm_rect *pipe_clip)
> +{
> +	const struct intel_plane *plane = to_intel_plane(new_plane_state->uapi.plane);
> +	int height;
> +
> +	if (plane->id != PLANE_CURSOR)
> +		return;
> +
> +	height = drm_rect_height(&new_plane_state->uapi.dst) / 2;
> +	damaged_area->y1 -=  height;
> +	damaged_area->y1 = max(damaged_area->y1, 0);
> +
> +	clip_area_update(pipe_clip, damaged_area);
> +}
> +
>   int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>   				struct intel_crtc *crtc)
>   {
> @@ -1627,6 +1649,9 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>   				damaged_area.y2 = new_plane_state->uapi.dst.y2;
>   				clip_area_update(&pipe_clip, &damaged_area);
>   			}
> +
> +			cursor_area_workaround(new_plane_state, &damaged_area,
> +					       &pipe_clip);
>   			continue;
>   		} else if (new_plane_state->uapi.alpha != old_plane_state->uapi.alpha) {
>   			/* If alpha changed mark the whole plane area as damaged */
>