From fcc8a22cc9053a8d1bbb94833ec103cd5961feef Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 11 Jan 2017 14:57:25 +0200 Subject: [PATCH] drm/edid: Set YQ bits in the AVI infoframe according to CEA-861-F MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Link: http://patchwork.freedesktop.org/patch/msgid/20170111125725.8086-6-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula Acked-by: Eric Anholt --- 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 292cb5023683..baa6ccb3e18b 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -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);