[Intel-gfx] [PATCH v4 2/2] drm/i915: Ensure damage clip area is within pipe area

[Souza, Jose]

On Fri, 2022-05-13 at 15:30 +0300, Jouni Högander wrote:
> Current update area calculation is not handling situation where
> e.g. cursor plane is fully or partially outside pipe area.
> 
> Fix this by checking damage area against pipe_src area using
> drm_rect_intersect.
> 
> v2: Set x1 and x2 in damaged_area initialization
> v3: Move drm_rect_intersect into clip_area_update
> v4: draw_area -> pipe_src

Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5440
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Cc: Mika Kahola <mika.kahola at intel.com>
> Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 1f031ebc1456..18058252037d 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1618,8 +1618,12 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
>  }
>  
>  static void clip_area_update(struct drm_rect *overlap_damage_area,
> -			     struct drm_rect *damage_area)
> +			     struct drm_rect *damage_area,
> +			     struct drm_rect *pipe_src)
>  {
> +	if (!drm_rect_intersect(damage_area, pipe_src))
> +		return;
> +
>  	if (overlap_damage_area->y1 == -1) {
>  		overlap_damage_area->y1 = damage_area->y1;
>  		overlap_damage_area->y2 = damage_area->y2;
> @@ -1709,7 +1713,8 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>  	 */
>  	for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
>  					     new_plane_state, i) {
> -		struct drm_rect src, damaged_area = { .y1 = -1 };
> +		struct drm_rect src, damaged_area = { .x1 = 0, .y1 = -1,
> +						      .x2 = INT_MAX };
>  		struct drm_atomic_helper_damage_iter iter;
>  		struct drm_rect clip;
>  
> @@ -1736,20 +1741,23 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>  			if (old_plane_state->uapi.visible) {
>  				damaged_area.y1 = old_plane_state->uapi.dst.y1;
>  				damaged_area.y2 = old_plane_state->uapi.dst.y2;
> -				clip_area_update(&pipe_clip, &damaged_area);
> +				clip_area_update(&pipe_clip, &damaged_area,
> +						 &crtc_state->pipe_src);
>  			}
>  
>  			if (new_plane_state->uapi.visible) {
>  				damaged_area.y1 = new_plane_state->uapi.dst.y1;
>  				damaged_area.y2 = new_plane_state->uapi.dst.y2;
> -				clip_area_update(&pipe_clip, &damaged_area);
> +				clip_area_update(&pipe_clip, &damaged_area,
> +						 &crtc_state->pipe_src);
>  			}
>  			continue;
>  		} else if (new_plane_state->uapi.alpha != old_plane_state->uapi.alpha) {
>  			/* If alpha changed mark the whole plane area as damaged */
>  			damaged_area.y1 = new_plane_state->uapi.dst.y1;
>  			damaged_area.y2 = new_plane_state->uapi.dst.y2;
> -			clip_area_update(&pipe_clip, &damaged_area);
> +			clip_area_update(&pipe_clip, &damaged_area,
> +					 &crtc_state->pipe_src);
>  			continue;
>  		}
>  
> @@ -1760,7 +1768,8 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>  						   &new_plane_state->uapi);
>  		drm_atomic_for_each_plane_damage(&iter, &clip) {
>  			if (drm_rect_intersect(&clip, &src))
> -				clip_area_update(&damaged_area, &clip);
> +				clip_area_update(&damaged_area, &clip,
> +						 &crtc_state->pipe_src);
>  		}
>  
>  		if (damaged_area.y1 == -1)
> @@ -1768,7 +1777,7 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state,
>  
>  		damaged_area.y1 += new_plane_state->uapi.dst.y1 - src.y1;
>  		damaged_area.y2 += new_plane_state->uapi.dst.y1 - src.y1;
> -		clip_area_update(&pipe_clip, &damaged_area);
> +		clip_area_update(&pipe_clip, &damaged_area, &crtc_state->pipe_src);
>  	}
>  
>  	/*