[PATCH 1/2] drm: Add DRM_MODE_FB_BFF flag definition

[Vincent Abriou]

From: Fabien Dessenne <fabien.dessenne at st.com>

If a buffer is interlaced, this "Bottom Field First" flag specifies
which of the top or the bottom field shall be displayed first.
When set, the bottom field shall be displayed first.
When unset the top field shall be displayed first.

Signed-off-by: Fabien Dessenne <fabien.dessenne at st.com>
---
 drivers/gpu/drm/drm_crtc.c  | 3 ++-
 include/uapi/drm/drm_mode.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d40bab2..64b4fdac 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3315,7 +3315,8 @@ internal_framebuffer_create(struct drm_device *dev,
 	struct drm_framebuffer *fb;
 	int ret;
 
-	if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
+	if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS
+			| DRM_MODE_FB_BFF)) {
 		DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
 		return ERR_PTR(-EINVAL);
 	}
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 50adb46..f7c9111 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -354,6 +354,7 @@ struct drm_mode_fb_cmd {
 
 #define DRM_MODE_FB_INTERLACED	(1<<0) /* for interlaced framebuffers */
 #define DRM_MODE_FB_MODIFIERS	(1<<1) /* enables ->modifer[] */
+#define DRM_MODE_FB_BFF		(1<<2) /* if interlaced, bottom field first */
 
 struct drm_mode_fb_cmd2 {
 	__u32 fb_id;
-- 
1.9.1