Commit fcc8a22c authored Jan 11, 2017 by Ville Syrjälä

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



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@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170111125725.8086-6-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Eric Anholt <eric@anholt.net>

parent 779c4c28

drivers/gpu/drm/drm_edid.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -4321,6 +4321,20 @@ 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);