linux-kernel - [PATCH] drm/edid: Add EDID_QUIRK_FORCE

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Date:   Mon, 20 Feb 2017 16:25:45 +0100
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     intel-gfx@...ts.freedesktop.org,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] 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: 7a0baa623446 ("Revert "drm/i915: Disable 12bpc hdmi for now"")
References: https://bugs.freedesktop.org/show_bug.cgi?id=99869
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 drivers/gpu/drm/drm_edid.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 24e7b282f16c..d994ccf94f88 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/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 },
 };
 
 /*
-- 
2.9.3