Merge tag 'v4.15-rc1' into drm-misc-fixes

[sfrench/cifs-2.6.git] / drivers / gpu / drm / drm_edid.c

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2e8fb51282ef36813873a18017a69f0c5abc3c47..5dfe147638716730573d008edc65abfc92f6d75a 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4831,7 +4831,8 @@ void
 drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
                                   const struct drm_display_mode *mode,
                                   enum hdmi_quantization_range rgb_quant_range,
-                                  bool rgb_quant_range_selectable)
+                                  bool rgb_quant_range_selectable,
+                                  bool is_hdmi2_sink)
 {
        /*
         * CEA-861:
@@ -4855,8 +4856,15 @@ drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
         *  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."
+        *
+        * Unfortunate certain sinks (eg. VIZ Model 67/E261VA) get confused
+        * by non-zero YQ when receiving RGB. There doesn't seem to be any
+        * good way to tell which version of CEA-861 the sink supports, so
+        * we limit non-zero YQ to HDMI 2.0 sinks only as HDMI 2.0 is based
+        * on on CEA-861-F.
         */
-       if (rgb_quant_range == HDMI_QUANTIZATION_RANGE_LIMITED)
+       if (!is_hdmi2_sink ||
+           rgb_quant_range == HDMI_QUANTIZATION_RANGE_LIMITED)
                frame->ycc_quantization_range =
                        HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
        else