drm_format_plane_width_bytes() calculates and returns
the number of bytes for given width of specified format.
The calculation uses the macro pixel information to avoid
bit level rounding.
Signed-off-by: Hyun Kwon <hyun.k...@xilinx.com>
---
v2
- This function is added
---
---
drivers/gpu/drm/drm_fourcc.c | 22 ++++++++++++++++++++++
include/drm/drm_fourcc.h | 2 ++
2 files changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 8fc1e35..2070276 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -376,3 +376,25 @@ int drm_format_plane_height(int height, uint32_t format,
int plane)
return height / info->vsub;
}
EXPORT_SYMBOL(drm_format_plane_height);
+
+/**
+ * drm_format_plane_width_bytes - bytes of the given width of the plane
+ * @info: DRM format information
+ * @plane: plane index
+ * @width: width to get the number of bytes
+ *
+ * Returns:
+ * The bytes of @width of @plane.
+ */
+int drm_format_plane_width_bytes(const struct drm_format_info *info,
+ int plane, int width)
+{
+ int width_bits;
+
+ if (!info || plane >= info->num_planes)
+ return 0;
+
+ width_bits = DIV_ROUND_UP(width * info->bpm[plane], info->ppm[plane]);
+ return DIV_ROUND_UP(width_bits, 8);
+}
+EXPORT_SYMBOL(drm_format_plane_width_bytes);
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 64038e9..1eafeb9 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -80,6 +80,8 @@ int drm_format_horz_chroma_subsampling(uint32_t format);
int drm_format_vert_chroma_subsampling(uint32_t format);
int drm_format_plane_width(int width, uint32_t format, int plane);
int drm_format_plane_height(int height, uint32_t format, int plane);
+int drm_format_plane_width_bytes(const struct drm_format_info *info,
+ int plane, int width);
const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf
*buf);
#endif /* __DRM_FOURCC_H__ */
--
2.7.4
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