linux-kernel - Re: [PATCH 10/12] drm/msm/dpu: drop redundant num_planes assignment in _dpu_format_populate_plane

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Message-ID: <29ae5bb3-092a-48fb-9d47-f23c92ac4616@oss.qualcomm.com>
Date: Thu, 4 Sep 2025 16:19:37 -0700
From: Jessica Zhang <jessica.zhang@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov
 <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jordan Crouse <jordan@...micpenguin.net>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] drm/msm/dpu: drop redundant num_planes assignment
 in _dpu_format_populate_plane_sizes*()



On 7/4/2025 7:47 PM, Dmitry Baryshkov wrote:
> Drop redundant layout->num_planes assignments, using the value assigned
> from the formats table. RGB UBWC formats need special handling: they use
> two planes (per the format table), but the uAPI defines plane[1] as
> empty.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

Reviewed-by: Jessica Zhang <jessica.zhang@....qualcomm.com>

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c | 11 +++--------
>   1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> index 195a6b7c4075eef40e7a5d0fee208168421cee35..e1fb7fd3b0b97a38880bc80aec26003d65a3a310 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> @@ -110,7 +110,6 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   		uint32_t y_meta_scanlines = 0;
>   		uint32_t uv_meta_scanlines = 0;
>   
> -		layout->num_planes = 2;
>   		layout->plane_pitch[0] = VENUS_Y_STRIDE(color, fb->width);
>   		y_sclines = VENUS_Y_SCANLINES(color, fb->height);
>   		layout->plane_size[0] = MSM_MEDIA_ALIGN(layout->plane_pitch[0] *
> @@ -124,7 +123,6 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   		if (!meta)
>   			return 0;
>   
> -		layout->num_planes += 2;
>   		layout->plane_pitch[2] = VENUS_Y_META_STRIDE(color, fb->width);
>   		y_meta_scanlines = VENUS_Y_META_SCANLINES(color, fb->height);
>   		layout->plane_size[2] = MSM_MEDIA_ALIGN(layout->plane_pitch[2] *
> @@ -138,8 +136,6 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   	} else {
>   		uint32_t rgb_scanlines, rgb_meta_scanlines;
>   
> -		layout->num_planes = 1;
> -
>   		layout->plane_pitch[0] = VENUS_RGB_STRIDE(color, fb->width);
>   		rgb_scanlines = VENUS_RGB_SCANLINES(color, fb->height);
>   		layout->plane_size[0] = MSM_MEDIA_ALIGN(layout->plane_pitch[0] *
> @@ -148,7 +144,9 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   		if (!meta)
>   			return 0;
>   
> -		layout->num_planes += 2;
> +		/* uAPI leaves plane[1] empty and plane[2] as meta */
> +		layout->num_planes += 1;
> +
>   		layout->plane_pitch[2] = VENUS_RGB_META_STRIDE(color, fb->width);
>   		rgb_meta_scanlines = VENUS_RGB_META_SCANLINES(color, fb->height);
>   		layout->plane_size[2] = MSM_MEDIA_ALIGN(layout->plane_pitch[2] *
> @@ -167,7 +165,6 @@ static int _dpu_format_populate_plane_sizes_linear(
>   
>   	/* Due to memset above, only need to set planes of interest */
>   	if (fmt->fetch_type == MDP_PLANE_INTERLEAVED) {
> -		layout->num_planes = 1;
>   		layout->plane_size[0] = fb->width * fb->height * fmt->bpp;
>   		layout->plane_pitch[0] = fb->width * fmt->bpp;
>   	} else {
> @@ -194,12 +191,10 @@ static int _dpu_format_populate_plane_sizes_linear(
>   				(fb->height / v_subsample);
>   
>   		if (fmt->fetch_type == MDP_PLANE_PSEUDO_PLANAR) {
> -			layout->num_planes = 2;
>   			layout->plane_size[1] *= 2;
>   			layout->plane_pitch[1] *= 2;
>   		} else {
>   			/* planar */
> -			layout->num_planes = 3;
>   			layout->plane_size[2] = layout->plane_size[1];
>   			layout->plane_pitch[2] = layout->plane_pitch[1];
>   		}
>