Re: [Intel-gfx] [PATCH v2 2/2] drm/i915: Ensure damage clip area is within pipe area

["Souza, Jose" <jose.souza@intel.com>]

On Mon, 2022-05-09 at 10:24 +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
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5440
> Cc: José Roberto de Souza <jose.souza@intel.com>
> Cc: Mika Kahola <mika.kahola@intel.com>
> Tested-by: Mark Pearson <markpearson@lenovo.com>
> Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 8c099d24de86..ecd062a0fea4 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1708,7 +1708,9 @@ 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 };
> +		/* Set damaged_area x1 and x2 for drm_rect_intersect usage */
> +		struct drm_rect src, damaged_area = { .x1 = 0, .y1 = -1,
> +						      .x2 = INT_MAX };

In my opinion this comment is not necessary.

>  		struct drm_atomic_helper_damage_iter iter;
>  		struct drm_rect clip;
>  
> @@ -1735,20 +1737,23 @@ 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);
> +				if (drm_rect_intersect(&damaged_area, &crtc_state->pipe_src))
> +					clip_area_update(&pipe_clip, &damaged_area);

What about the suggestion to move the drm_rect_intersect() to clip_area_update()?

>  			}
>  
>  			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);
> +				if (drm_rect_intersect(&damaged_area, &crtc_state->pipe_src))
> +					clip_area_update(&pipe_clip, &damaged_area);
>  			}
>  			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);
> +			if (drm_rect_intersect(&damaged_area, &crtc_state->pipe_src))
> +				clip_area_update(&pipe_clip, &damaged_area);
>  			continue;
>  		}
>  
> @@ -1767,7 +1772,9 @@ 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);
> +
> +		if (drm_rect_intersect(&damaged_area, &crtc_state->pipe_src))
> +			clip_area_update(&pipe_clip, &damaged_area);
>  	}
>  
>  	if (pipe_clip.y1 == -1)