[PATCH v3 07/15] drm/connector: hdmi: Use YUV420 output format as an RGB fallback

[Cristian Ciocaltea]

Try to make use of YUV420 when computing the best output format and
RGB cannot be supported for any of the available color depths.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 6de0abb15ecb36fd4eb98725e2a3835e5e0db134..3859600c6af4a79f30858adfc9f9a710dfe561a5 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -650,7 +650,17 @@ hdmi_compute_config(const struct drm_connector *connector,
 
 	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
 				      HDMI_COLORSPACE_RGB);
+	if (!ret)
+		return 0;
 
+	if (!connector->ycbcr_420_allowed) {
+		drm_dbg_kms(connector->dev,
+			    "YUV420 output format not allowed for connector.\n");
+		return -EINVAL;
+	}
+
+	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
+				      HDMI_COLORSPACE_YUV420);
 	return ret;
 }
 

-- 
2.49.0