diff options
| author | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-05-16 12:31:48 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-05-20 13:33:11 +0200 |
| commit | f3e9632cb6241a6c098427510ad3ee041365ae64 (patch) | |
| tree | 60a1e4318a180b4281da1e31d8aed53497018621 /drivers/gpu/drm/drm_fourcc.c | |
| parent | 05c452c115bffa12f78346723f0282a4264ed200 (diff) | |
drm: Remove users of drm_format_(horz|vert)_chroma_subsampling
drm_format_horz_chroma_subsampling and drm_format_vert_chroma_subsampling
are basically a lookup in the drm_format_info table plus an access to the
hsub and vsub fields of the appropriate entry.
Most drivers are using this function while having access to the entry
already, which means that we will perform an unnecessary lookup. Removing
the call to these functions is therefore more efficient.
Some drivers will not have access to that entry in the function, but in
this case the overhead is minimal (we just have to call drm_format_info()
to perform the lookup) and we can even avoid multiple, inefficient lookups
in some places that need multiple fields from the drm_format_info
structure.
This is amplified by the fact that most of the time the callers will have
to retrieve both the vsub and hsub fields, meaning that they would perform
twice the lookup.
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6b3cceb8161e2c1d40c2681de99202328b0a8abc.1558002671.git-series.maxime.ripard@bootlin.com
Diffstat (limited to 'drivers/gpu/drm/drm_fourcc.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fourcc.c | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c index 873c0001d8c8..e4a2c8372c8b 100644 --- a/drivers/gpu/drm/drm_fourcc.c +++ b/drivers/gpu/drm/drm_fourcc.c @@ -353,40 +353,6 @@ int drm_format_plane_cpp(uint32_t format, int plane) EXPORT_SYMBOL(drm_format_plane_cpp); /** - * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor - * @format: pixel format (DRM_FORMAT_*) - * - * Returns: - * The horizontal chroma subsampling factor for the - * specified pixel format. - */ -int drm_format_horz_chroma_subsampling(uint32_t format) -{ - const struct drm_format_info *info; - - info = drm_format_info(format); - return info ? info->hsub : 1; -} -EXPORT_SYMBOL(drm_format_horz_chroma_subsampling); - -/** - * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor - * @format: pixel format (DRM_FORMAT_*) - * - * Returns: - * The vertical chroma subsampling factor for the - * specified pixel format. - */ -int drm_format_vert_chroma_subsampling(uint32_t format) -{ - const struct drm_format_info *info; - - info = drm_format_info(format); - return info ? info->vsub : 1; -} -EXPORT_SYMBOL(drm_format_vert_chroma_subsampling); - -/** * drm_format_plane_width - width of the plane given the first plane * @width: width of the first plane * @format: pixel format |