[PATCH] drm: fix pixel size of NV12 / NV16 pixel formats

[Fabien Dessenne]

With NV12, NV21, NV16 and NV61 formats, the size of one pixel from the
UV plane (plane #1) is one byte.

Indeed, these pixel formats use 4:2:x chroma subsampling: the chroma
pixels are sampled at half the luma: for 2 pixels, there are 1 Cb +
1 Cr = 2 bytes.
So for plane #1, the correct size is actually 1 byte per pixel.

Signed-off-by: Fabien Dessenne <fabien.dessenne at st.com>
---
 drivers/gpu/drm/drm_crtc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 3313f7e..572c6fa 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5618,10 +5618,6 @@ int drm_format_plane_cpp(uint32_t format, int plane)
 	case DRM_FORMAT_UYVY:
 	case DRM_FORMAT_VYUY:
 		return 2;
-	case DRM_FORMAT_NV12:
-	case DRM_FORMAT_NV21:
-	case DRM_FORMAT_NV16:
-	case DRM_FORMAT_NV61:
 	case DRM_FORMAT_NV24:
 	case DRM_FORMAT_NV42:
 		return plane ? 2 : 1;
@@ -5635,6 +5631,10 @@ int drm_format_plane_cpp(uint32_t format, int plane)
 	case DRM_FORMAT_YVU422:
 	case DRM_FORMAT_YUV444:
 	case DRM_FORMAT_YVU444:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
 		return 1;
 	default:
 		drm_fb_get_bpp_depth(format, &depth, &bpp);
-- 
1.9.1