drm/edid: Add EDID_QUIRK_FORCE_8BPC quirk for Rotel RSX-1058

Rotel RSX-1058 is a receiver with 4 HDMI inputs and a HDMI output, all
1.1.

When a sink that supports deep color is connected to the output, the
receiver will send EDIDs that advertise this capability, even if it
isn't possible with HDMI versions earlier than 1.3.

Currently the kernel is assuming that deep color is possible and the
sink displays an error.

This quirk will make sure that deep color isn't used with this
particular receiver.

Fixes: 7a0baa6 ("Revert "drm/i915: Disable 12bpc hdmi for now"")
Signed-off-by: Tomeu Vizoso <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Cc: [email protected]
Cc: Matt Horan <[email protected]>
Tested-by: Matt Horan <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99869
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>

drivers/gpu/drm/drm_edid.c

@@ -148,6 +148,9 @@ static const struct edid_quirk {
 
 	/* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
 	{ "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },
+
+	/* Rotel RSX-1058 forwards sink's EDID but only does HDMI 1.1*/
+	{ "ETR", 13896, EDID_QUIRK_FORCE_8BPC },
 };
 
 /*