From: Ville Syrjälä ville.syrjala@linux.intel.com
This function returns the bytes per pixel value based on the pixel format and plane index.
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_crtc_helper.c | 43 +++++++++++++++++++++++++++++++++++++ include/drm/drm_crtc_helper.h | 1 + 2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index db59561..7c5c516 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -1044,3 +1044,46 @@ int drm_format_num_planes(uint32_t format) } } EXPORT_SYMBOL(drm_format_num_planes); + +/** + * drm_format_plane_cpp - determine the bytes per pixel value + * @format: pixel format (V4L2_PIX_FMT_*) + * @plane: plane index + * + * See linux/videodev2.h for valid values of @format. + * + * RETURNS: + * The bytes per pixel value for the specified plane. + */ +int drm_format_plane_cpp(uint32_t format, int plane) +{ + unsigned int depth; + int bpp; + + if (plane >= drm_format_num_planes(format)) + return 0; + + switch (format) { + case V4L2_PIX_FMT_YUYV: + case V4L2_PIX_FMT_YVYU: + case V4L2_PIX_FMT_UYVY: + case V4L2_PIX_FMT_VYUY: + return 2; + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + return plane ? 2 : 1; + case V4L2_PIX_FMT_YUV410: + case V4L2_PIX_FMT_YVU410: + case V4L2_PIX_FMT_YUV420: + case V4L2_PIX_FMT_YVU420: + case V4L2_PIX_FMT_YUV411P: + case V4L2_PIX_FMT_YUV422P: + return 1; + default: + drm_helper_get_fb_bpp_depth(format, &depth, &bpp); + return bpp >> 3; + } +} +EXPORT_SYMBOL(drm_format_plane_cpp); diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h index 20a43f7..9996643 100644 --- a/include/drm/drm_crtc_helper.h +++ b/include/drm/drm_crtc_helper.h @@ -148,5 +148,6 @@ extern void drm_kms_helper_poll_disable(struct drm_device *dev); extern void drm_kms_helper_poll_enable(struct drm_device *dev);
extern int drm_format_num_planes(uint32_t format); +extern int drm_format_plane_cpp(uint32_t format, int plane);
#endif