[Intel-gfx] [PATCH 2/2] drm/i915: Add debugs for the C8 vs. legacy LUT case

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Leave a hint in dmesg when we reject a configuration attempting
to use C8 planes without the legacy LUT loaded.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_color.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 962db1236970..45649904ba5c 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -959,8 +959,10 @@ static int check_luts(const struct intel_crtc_state *crtc_state)
 		return 0;
 
 	/* C8 relies on its palette being stored in the legacy LUT */
-	if (crtc_state->c8_planes)
+	if (crtc_state->c8_planes) {
+		DRM_DEBUG_KMS("C8 pixelformat requires the legacy LUT\n");
 		return -EINVAL;
+	}
 
 	degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
 	gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
-- 
2.21.0