Re: [PATCH v3 5/7] drm/fourcc: Pass the format_info pointer to drm_format_plane_width/height

[Paul Kocialkowski <paul.kocialkowski@bootlin.com>]

Hi,

On Thu 16 May 19, 12:31, Maxime Ripard wrote:
> So far, the drm_format_plane_height/width functions were operating on the
> format's fourcc and was doing a lookup to retrieve the drm_format_info
> structure and return the cpp.
> 
> However, this is inefficient since in most cases, we will have the
> drm_format_info pointer already available so we shouldn't have to perform a
> new lookup. Some drm_fourcc functions also already operate on the
> drm_format_info pointer for that reason, so the API is quite inconsistent
> there.
> 
> Let's follow the latter pattern and remove the extra lookup while being a
> bit more consistent.
> 
> In order to be extra consistent, also rename that function to
> drm_format_info_plane_cpp and to a static function in the header to match
> the current policy. The parameters order have also be changed to match the
> other functions prototype.

Same comment about plane being int instead of unsigned int, but I think we
can fix that later.

Another thing that I find odd is that the division by vsub/hsub is not
rounded up, but again, it's something independent from your patch.

Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

Cheers,

Paul

> Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c          | 48 +----------------------------
>  drivers/gpu/drm/meson/meson_overlay.c | 12 +++----
>  include/drm/drm_fourcc.h              | 46 +++++++++++++++++++++++++--
>  3 files changed, 50 insertions(+), 56 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 5f63fc74e265..35b459d186c5 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -333,54 +333,6 @@ drm_get_format_info(struct drm_device *dev,
>  EXPORT_SYMBOL(drm_get_format_info);
>  
>  /**
> - * drm_format_plane_width - width of the plane given the first plane
> - * @width: width of the first plane
> - * @format: pixel format
> - * @plane: plane index
> - *
> - * Returns:
> - * The width of @plane, given that the width of the first plane is @width.
> - */
> -int drm_format_plane_width(int width, uint32_t format, int plane)
> -{
> -	const struct drm_format_info *info;
> -
> -	info = drm_format_info(format);
> -	if (!info || plane >= info->num_planes)
> -		return 0;
> -
> -	if (plane == 0)
> -		return width;
> -
> -	return width / info->hsub;
> -}
> -EXPORT_SYMBOL(drm_format_plane_width);
> -
> -/**
> - * drm_format_plane_height - height of the plane given the first plane
> - * @height: height of the first plane
> - * @format: pixel format
> - * @plane: plane index
> - *
> - * Returns:
> - * The height of @plane, given that the height of the first plane is @height.
> - */
> -int drm_format_plane_height(int height, uint32_t format, int plane)
> -{
> -	const struct drm_format_info *info;
> -
> -	info = drm_format_info(format);
> -	if (!info || plane >= info->num_planes)
> -		return 0;
> -
> -	if (plane == 0)
> -		return height;
> -
> -	return height / info->vsub;
> -}
> -EXPORT_SYMBOL(drm_format_plane_height);
> -
> -/**
>   * drm_format_info_block_width - width in pixels of block.
>   * @info: pixel format info
>   * @plane: plane index
> diff --git a/drivers/gpu/drm/meson/meson_overlay.c b/drivers/gpu/drm/meson/meson_overlay.c
> index fb8515b2860c..55b3f2f2e608 100644
> --- a/drivers/gpu/drm/meson/meson_overlay.c
> +++ b/drivers/gpu/drm/meson/meson_overlay.c
> @@ -466,8 +466,8 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
>  		priv->viu.vd1_addr2 = gem->paddr + fb->offsets[2];
>  		priv->viu.vd1_stride2 = fb->pitches[2];
>  		priv->viu.vd1_height2 =
> -			drm_format_plane_height(fb->height,
> -						fb->format->format, 2);
> +			drm_format_info_plane_height(fb->format,
> +						fb->height, 2);
>  		DRM_DEBUG("plane 2 addr 0x%x stride %d height %d\n",
>  			 priv->viu.vd1_addr2,
>  			 priv->viu.vd1_stride2,
> @@ -478,8 +478,8 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
>  		priv->viu.vd1_addr1 = gem->paddr + fb->offsets[1];
>  		priv->viu.vd1_stride1 = fb->pitches[1];
>  		priv->viu.vd1_height1 =
> -			drm_format_plane_height(fb->height,
> -						fb->format->format, 1);
> +			drm_format_info_plane_height(fb->format,
> +						fb->height, 1);
>  		DRM_DEBUG("plane 1 addr 0x%x stride %d height %d\n",
>  			 priv->viu.vd1_addr1,
>  			 priv->viu.vd1_stride1,
> @@ -490,8 +490,8 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
>  		priv->viu.vd1_addr0 = gem->paddr + fb->offsets[0];
>  		priv->viu.vd1_stride0 = fb->pitches[0];
>  		priv->viu.vd1_height0 =
> -			drm_format_plane_height(fb->height,
> -						fb->format->format, 0);
> +			drm_format_info_plane_height(fb->format,
> +						fb->height, 0);
>  		DRM_DEBUG("plane 0 addr 0x%x stride %d height %d\n",
>  			 priv->viu.vd1_addr0,
>  			 priv->viu.vd1_stride0,
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 6b5a82b31bc4..4ef8ccb5d236 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -277,6 +277,50 @@ int drm_format_info_plane_cpp(const struct drm_format_info *info, int plane)
>  	return info->cpp[plane];
>  }
>  
> +/**
> + * drm_format_info_plane_width - width of the plane given the first plane
> + * @format: pixel format info
> + * @width: width of the first plane
> + * @plane: plane index
> + *
> + * Returns:
> + * The width of @plane, given that the width of the first plane is @width.
> + */
> +static inline
> +int drm_format_info_plane_width(const struct drm_format_info *info, int width,
> +				int plane)
> +{
> +	if (!info || plane >= info->num_planes)
> +		return 0;
> +
> +	if (plane == 0)
> +		return width;
> +
> +	return width / info->hsub;
> +}
> +
> +/**
> + * drm_format_info_plane_height - height of the plane given the first plane
> + * @format: pixel format info
> + * @height: height of the first plane
> + * @plane: plane index
> + *
> + * Returns:
> + * The height of @plane, given that the height of the first plane is @height.
> + */
> +static inline
> +int drm_format_info_plane_height(const struct drm_format_info *info, int height,
> +				 int plane)
> +{
> +	if (!info || plane >= info->num_planes)
> +		return 0;
> +
> +	if (plane == 0)
> +		return height;
> +
> +	return height / info->vsub;
> +}
> +
>  const struct drm_format_info *__drm_format_info(u32 format);
>  const struct drm_format_info *drm_format_info(u32 format);
>  const struct drm_format_info *
> @@ -285,8 +329,6 @@ drm_get_format_info(struct drm_device *dev,
>  uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
>  uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
>  				     uint32_t bpp, uint32_t depth);
> -int drm_format_plane_width(int width, uint32_t format, int plane);
> -int drm_format_plane_height(int height, uint32_t format, int plane);
>  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
>  					 int plane);
>  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> -- 
> git-series 0.9.1
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-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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