[PATCH] drm: Print erroneous hscale/vscale on failure

[Sean Paul]

From: Sean Paul <seanpaul at chromium.org>

I ran across this last week when I was trying to get this function to
work. It's useful to have the scale values in the log upon failure.

Signed-off-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/drm_atomic_helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 2c23a48482da..1725546d5105 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -758,7 +758,8 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
 	hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
 	vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
 	if (hscale < 0 || vscale < 0) {
-		DRM_DEBUG_KMS("Invalid scaling of plane\n");
+		DRM_DEBUG_KMS("Invalid scaling of plane (%d/%d)\n",
+			      hscale, vscale);
 		drm_rect_debug_print("src: ", &plane_state->src, true);
 		drm_rect_debug_print("dst: ", &plane_state->dst, false);
 		return -ERANGE;
-- 
Sean Paul, Software Engineer, Google / Chromium OS