[PATCH 5/5] drm/edid: Set YQ bits in the AVI infoframe according to CEA-861-F

[ville.syrjala at linux.intel.com]

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

CEA-861-F tells us:
"When transmitting any RGB colorimetry, the Source should set the
 YQ-field to match the RGB Quantization Range being transmitted
 (e.g., when Limited Range RGB, set YQ=0 or when Full Range RGB,
 set YQ=1) and the Sink shall ignore the YQ-field."

So let's go ahead and do that. Perhaps there are sinks that don't
ignore the YQ as they should for RGB?

I wasn't able to find similar text in CEA-861-E, so it would seem
to be a fairly "recent" addition.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index caa2435bac31..6ba9a1a6eae4 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4320,6 +4320,20 @@ drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
 		frame->quantization_range = rgb_quant_range;
 	else
 		frame->quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
+
+	/*
+	 * CEA-861-F:
+	 * "When transmitting any RGB colorimetry, the Source should set the
+	 *  YQ-field to match the RGB Quantization Range being transmitted
+	 *  (e.g., when Limited Range RGB, set YQ=0 or when Full Range RGB,
+	 *  set YQ=1) and the Sink shall ignore the YQ-field."
+	 */
+	if (rgb_quant_range == HDMI_QUANTIZATION_RANGE_LIMITED)
+		frame->ycc_quantization_range =
+			HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
+	else
+		frame->ycc_quantization_range =
+			HDMI_YCC_QUANTIZATION_RANGE_FULL;
 }
 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_quant_range);
 
-- 
2.10.2