Various pieces of information about DRM formats (number of planes, color
depth, chroma subsampling, ...) are scattered across different helper
functions in the DRM core. Callers of those functions often need to
access more than a single parameter of the format, leading to
inefficiencies due to multiple lookups.
Centralize all format information in a data structure and create a
function to look up information based on the format 4CC.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_crtc.h | 21 ++++++++++++
2 files changed, 104 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 0e3cc66aa8b7..74b0c6dd80cd 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5544,6 +5544,89 @@ int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
}
/**
+ * drm_format_info - information for a given format
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * Returns:
+ * The instance of struct drm_format_info that describes the pixel format, or
+ * NULL if the format is unsupported.
+ */
+const struct drm_format_info *drm_format_info(u32 format)
+{
+ static const struct drm_format_info formats[] = {
+ { DRM_FORMAT_C8, 8, 8, 1, { 1 }, 1, 1 },
+ { DRM_FORMAT_RGB332, 8, 8, 1, { 1 }, 1, 1 },
+ { DRM_FORMAT_BGR233, 8, 8, 1, { 1 }, 1, 1 },
+ { DRM_FORMAT_XRGB4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_XBGR4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGBX4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_BGRX4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_ARGB4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_ABGR4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGBA4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_BGRA4444, 12, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_XRGB1555, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_XBGR1555, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGBX5551, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_BGRX5551, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_ARGB1555, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_ABGR1555, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGBA5551, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_BGRA5551, 15, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGB565, 16, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_BGR565, 16, 16, 1, { 2 }, 1, 1 },
+ { DRM_FORMAT_RGB888, 24, 24, 1, { 3 }, 1, 1 },
+ { DRM_FORMAT_BGR888, 24, 24, 1, { 3 }, 1, 1 },
+ { DRM_FORMAT_XRGB8888, 24, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_XBGR8888, 24, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_RGBX8888, 24, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_BGRX8888, 24, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_XRGB2101010, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_XBGR2101010, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_RGBX1010102, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_BGRX1010102, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_ARGB2101010, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_ABGR2101010, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_RGBA1010102, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_BGRA1010102, 30, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_ARGB8888, 32, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_ABGR8888, 32, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_RGBA8888, 32, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_BGRA8888, 32, 32, 1, { 4 }, 1, 1 },
+ { DRM_FORMAT_YUV410, 0, 0, 3, { 1, 1, 1 }, 4, 4 },
+ { DRM_FORMAT_YVU410, 0, 0, 3, { 1, 1, 1 }, 4, 4 },
+ { DRM_FORMAT_YUV411, 0, 0, 3, { 1, 1, 1 }, 4, 1 },
+ { DRM_FORMAT_YVU411, 0, 0, 3, { 1, 1, 1 }, 4, 1 },
+ { DRM_FORMAT_YUV420, 0, 0, 3, { 1, 1, 1 }, 2, 2 },
+ { DRM_FORMAT_YVU420, 0, 0, 3, { 1, 1, 1 }, 2, 2 },
+ { DRM_FORMAT_YUV422, 0, 0, 3, { 1, 1, 1 }, 2, 1 },
+ { DRM_FORMAT_YVU422, 0, 0, 3, { 1, 1, 1 }, 2, 1 },
+ { DRM_FORMAT_YUV444, 0, 0, 3, { 1, 1, 1 }, 1, 1 },
+ { DRM_FORMAT_YVU444, 0, 0, 3, { 1, 1, 1 }, 1, 1 },
+ { DRM_FORMAT_NV12, 0, 0, 2, { 1, 2 }, 2, 2 },
+ { DRM_FORMAT_NV21, 0, 0, 2, { 1, 2 }, 2, 2 },
+ { DRM_FORMAT_NV16, 0, 0, 2, { 1, 2 }, 2, 1 },
+ { DRM_FORMAT_NV61, 0, 0, 2, { 1, 2 }, 2, 1 },
+ { DRM_FORMAT_NV24, 0, 0, 2, { 1, 2 }, 1, 1 },
+ { DRM_FORMAT_NV42, 0, 0, 2, { 1, 2 }, 1, 1 },
+ { DRM_FORMAT_YUYV, 0, 0, 1, { 2 }, 2, 1 },
+ { DRM_FORMAT_YVYU, 0, 0, 1, { 2 }, 2, 1 },
+ { DRM_FORMAT_UYVY, 0, 0, 1, { 2 }, 2, 1 },
+ { DRM_FORMAT_VYUY, 0, 0, 1, { 2 }, 2, 1 },
+ { DRM_FORMAT_AYUV, 0, 0, 1, { 4 }, 1, 1 },
+ };
+
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(formats); ++i) {
+ if (formats[i].format == format)
+ return &formats[i];
+ }
+
+ return NULL;
+}
+
+/**
* drm_fb_get_bpp_depth - get the bpp/depth values for format
* @format: pixel format (DRM_FORMAT_*)
* @depth: storage for the depth value
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index d1559cd04e3d..4199794cc317 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -155,6 +155,26 @@ struct drm_display_info {
u8 cea_rev;
};
+/**
+ * struct drm_format_info - information about a DRM format
+ * @format: 4CC format identifier (DRM_FORMAT_*)
+ * @depth: color depth (number of bits per pixel excluding padding bits)
+ * @bpp: number of bits per pixel including padding
+ * @num_planes: number of color planes (1 to 3)
+ * @cpp: number of bytes per pixel (per plane)
+ * @hsub: horizontal chroma subsampling factor
+ * @vsub: vertical chroma subsampling factor
+ */
+struct drm_format_info {
+ u32 format;
+ unsigned int depth;
+ unsigned int bpp;
+ unsigned int num_planes;
+ unsigned int cpp[3];
+ unsigned int hsub;
+ unsigned int vsub;
+};
+
/* data corresponds to displayid vend/prod/serial */
struct drm_tile_group {
struct kref refcount;
@@ -2540,6 +2560,7 @@ extern int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
extern int drm_mode_atomic_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
+extern const struct drm_format_info *drm_format_info(u32 format);
extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
int *bpp);
extern int drm_format_num_planes(uint32_t format);
--
Regards,
Laurent Pinchart
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