The src_w / src_h parameters to update_plane include a subpixel offset; we need to shift off the subpixel bits before comparing to CRTC size when checking for primary plane scaling.
Signed-off-by: Matt Roper matthew.d.roper@intel.com --- drivers/gpu/drm/drm_plane_helper.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index e768d35..9eca283 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -145,6 +145,8 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc, }
/* Disallow scaling */ + src_w >>= 16; + src_h >>= 16; if (crtc_w != src_w || crtc_h != src_h) { DRM_DEBUG_KMS("Can't scale primary plane\n"); return -EINVAL;