[PATCH] drm: check_pixel_format() should return true if no modifiers are passed for a supported pixel format

[Ayan Kumar Halder]

If a plane supports a pixel format and the framebuffer does not pass any
modifiers, then drm_plane_check_pixel_format() should always return true
for the given format regardless of whether the plane supports any
modifiers or not.

Signed-off-by: Ayan Kumar Halder <ayan.halder at arm.com>
---
 drivers/gpu/drm/drm_plane.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 6d2a6e4..873c084 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -564,6 +564,9 @@ int drm_plane_check_pixel_format(struct drm_plane *plane,
 	if (!plane->modifier_count)
 		return 0;
 
+	if (modifier == DRM_FORMAT_MOD_NONE)
+		return 0;
+
 	for (i = 0; i < plane->modifier_count; i++) {
 		if (modifier == plane->modifiers[i])
 			break;
-- 
2.7.4