From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
This function returns the bytes per pixel value based on the pixel
format and plane index.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
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
--
1.7.3.4
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