linux-kernel - Re: [PATCH] drm/amd/display: Write to correct dirty

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Date:   Mon, 13 Mar 2023 08:00:29 -0400
From:   Hamza Mahfooz <hamza.mahfooz@....com>
To:     Benjamin Cheng <ben@...eng.me>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Write to correct dirty_rect

On 3/12/23 20:47, Benjamin Cheng wrote:
> When FB_DAMAGE_CLIPS are provided in a non-MPO scenario, the loop does
> not use the counter i. This causes the fill_dc_dity_rect() to always
> fill dirty_rects[0], causing graphical artifacts when a damage clip
> aware DRM client sends more than 1 damage clip.
> 
> Instead, use the flip_addrs->dirty_rect_count which is incremented by
> fill_dc_dirty_rect() on a successful fill.
> 
> Fixes: 30ebe41582d1 ("drm/amd/display: add FB_DAMAGE_CLIPS support")
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2453
> Signed-off-by: Benjamin Cheng <ben@...eng.me>

Applied, thanks for catching this!

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 8af58bba503f..a89ec2cc4ffc 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -5130,9 +5130,9 @@ static void fill_dc_dirty_rects(struct drm_plane *plane,
>   
>   		for (; flip_addrs->dirty_rect_count < num_clips; clips++)
>   			fill_dc_dirty_rect(new_plane_state->plane,
> -					   &dirty_rects[i], clips->x1,
> -					   clips->y1, clips->x2 - clips->x1,
> -					   clips->y2 - clips->y1,
> +					   &dirty_rects[flip_addrs->dirty_rect_count],
> +					   clips->x1, clips->y1,
> +					   clips->x2 - clips->x1, clips->y2 - clips->y1,
>   					   &flip_addrs->dirty_rect_count,
>   					   false);
>   		return;

-- 
Hamza