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

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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>
(cherry picked from commit fcc8a22cc9)

Change-Id: I355b86175d2b33e88bd384a01f7e6378b21d13fd
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
This commit is contained in:
Ville Syrjälä
2017-01-11 14:57:25 +02:00
committed by Tao Huang
parent 2b882c1f35
commit 0c17d3a6a0
1 changed files with 14 additions and 0 deletions
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14
drivers/gpu/drm/drm_edid.c
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@@ -4882,6 +4882,20 @@ 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);