linux-kernel - Re: [PATCH 09/12] drm/msm/dpu: simplify _dpu_format_populate_plane_sizes

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Message-ID: <6e8b5af4-c4c3-4354-84ce-5d35475032ac@oss.qualcomm.com>
Date: Thu, 4 Sep 2025 16:19:19 -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 09/12] drm/msm/dpu: simplify
 _dpu_format_populate_plane_sizes_*



On 7/4/2025 7:47 PM, Dmitry Baryshkov wrote:
> Move common bits of _dpu_format_populate_plane_sizes_ubwc() and
> _linear() to dpu_format_populate_plane_sizes(), reducing unnecessary
> duplication and simplifying code flow fror the UBWC function.
> 
> 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 | 41 +++++++++++++----------------
>   1 file changed, 19 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> index 59c9427da7dda07b8e8ee3d070d2dfb3c165698e..195a6b7c4075eef40e7a5d0fee208168421cee35 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c
> @@ -95,15 +95,9 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   		struct drm_framebuffer *fb,
>   		struct dpu_hw_fmt_layout *layout)
>   {
> -	int i;
>   	int color;
>   	bool meta = MSM_FORMAT_IS_UBWC(fmt);
>   
> -	memset(layout, 0, sizeof(struct dpu_hw_fmt_layout));
> -	layout->width = fb->width;
> -	layout->height = fb->height;
> -	layout->num_planes = fmt->num_planes;
> -
>   	color = _dpu_format_get_media_color_ubwc(fmt);
>   	if (color < 0) {
>   		DRM_ERROR("UBWC format not supported for fmt: %p4cc\n",
> @@ -128,7 +122,7 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   			uv_sclines, DPU_UBWC_PLANE_SIZE_ALIGNMENT);
>   
>   		if (!meta)
> -			goto done;
> +			return 0;
>   
>   		layout->num_planes += 2;
>   		layout->plane_pitch[2] = VENUS_Y_META_STRIDE(color, fb->width);
> @@ -152,7 +146,8 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   			rgb_scanlines, DPU_UBWC_PLANE_SIZE_ALIGNMENT);
>   
>   		if (!meta)
> -			goto done;
> +			return 0;
> +
>   		layout->num_planes += 2;
>   		layout->plane_pitch[2] = VENUS_RGB_META_STRIDE(color, fb->width);
>   		rgb_meta_scanlines = VENUS_RGB_META_SCANLINES(color, fb->height);
> @@ -160,10 +155,6 @@ static int _dpu_format_populate_plane_sizes_ubwc(
>   			rgb_meta_scanlines, DPU_UBWC_PLANE_SIZE_ALIGNMENT);
>   	}
>   
> -done:
> -	for (i = 0; i < DPU_MAX_PLANES; i++)
> -		layout->total_size += layout->plane_size[i];
> -
>   	return 0;
>   }
>   
> @@ -174,11 +165,6 @@ static int _dpu_format_populate_plane_sizes_linear(
>   {
>   	int i;
>   
> -	memset(layout, 0, sizeof(struct dpu_hw_fmt_layout));
> -	layout->width = fb->width;
> -	layout->height = fb->height;
> -	layout->num_planes = fmt->num_planes;
> -
>   	/* Due to memset above, only need to set planes of interest */
>   	if (fmt->fetch_type == MDP_PLANE_INTERLEAVED) {
>   		layout->num_planes = 1;
> @@ -235,9 +221,6 @@ static int _dpu_format_populate_plane_sizes_linear(
>   		}
>   	}
>   
> -	for (i = 0; i < DPU_MAX_PLANES; i++)
> -		layout->total_size += layout->plane_size[i];
> -
>   	return 0;
>   }
>   
> @@ -254,6 +237,7 @@ int dpu_format_populate_plane_sizes(
>   		struct dpu_hw_fmt_layout *layout)
>   {
>   	const struct msm_format *fmt;
> +	int ret, i;
>   
>   	if (!layout || !fb) {
>   		DRM_ERROR("invalid pointer\n");
> @@ -268,10 +252,23 @@ int dpu_format_populate_plane_sizes(
>   
>   	fmt = msm_framebuffer_format(fb);
>   
> +	memset(layout, 0, sizeof(struct dpu_hw_fmt_layout));
> +	layout->width = fb->width;
> +	layout->height = fb->height;
> +	layout->num_planes = fmt->num_planes;
> +
>   	if (MSM_FORMAT_IS_UBWC(fmt) || MSM_FORMAT_IS_TILE(fmt))
> -		return _dpu_format_populate_plane_sizes_ubwc(fmt, fb, layout);
> +		ret = _dpu_format_populate_plane_sizes_ubwc(fmt, fb, layout);
> +	else
> +		ret = _dpu_format_populate_plane_sizes_linear(fmt, fb, layout);
>   
> -	return _dpu_format_populate_plane_sizes_linear(fmt, fb, layout);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < DPU_MAX_PLANES; i++)
> +		layout->total_size += layout->plane_size[i];
> +
> +	return 0;
>   }
>   
>   static void _dpu_format_populate_addrs_ubwc(struct msm_gem_address_space *aspace,
>