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drm/edid: Set AVI infoframe Q even when QS=0

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HDMI 2.0 recommends that we set the Q bits in the AVI infoframe
even when the sink does not support quantization range selection (QS=0).
According to CEA-861 we can do that as long as the Q we send matches
the default quantization range for the mode.

Previously I think I had misread the spec as saying that you can't
send a non-zero Q at all when QS=0. But that's not what the spec
actually says.

v2: Fix typo in commit message (Jani)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170111125725.8086-5-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Ville Syrjälä
2017-01-11 14:57:24 +02:00
parent a2ce26f815
commit 779c4c2866
4 changed files with 13 additions and 4 deletions
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2
drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -356,7 +356,7 @@ static void vc4_hdmi_set_avi_infoframe(struct drm_encoder *encoder)
return;
}
drm_hdmi_avi_infoframe_quant_range(&frame.avi,
drm_hdmi_avi_infoframe_quant_range(&frame.avi, mode,
vc4_encoder->limited_rgb_range ?
HDMI_QUANTIZATION_RANGE_LIMITED :
HDMI_QUANTIZATION_RANGE_FULL,