From: Ville Syrjälä <ville.syrj...@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.syrj...@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
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