linux-kernel - [PATCH] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80

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Message-Id: <20180823055332.7723-1-kai.heng.feng@canonical.com>
Date:   Thu, 23 Aug 2018 05:53:32 +0000
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     gustavo@...ovan.org, maarten.lankhorst@...ux.intel.com,
        sean@...rly.run, airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        stable@...r.kernel.org
Subject: [PATCH] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80

Another panel that reports "DFP 1.x compliant TMDS" but it supports 6bpc
instead of 8 bpc.

Apply 6 bpc quirk for the panel to fix it.

BugLink: https://bugs.launchpad.net/bugs/1788308
Cc: <stable@...r.kernel.org> # v4.8+
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.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 5dc742b27ca0..3c9fc99648b7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -116,6 +116,9 @@ static const struct edid_quirk {
 	/* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
 	{ "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
 
+	/* SDC panel of Lenovo B50-80 reports 8 bpc, but is a 6 bpc panel */
+	{ "SDC", 0x3652, EDID_QUIRK_FORCE_6BPC },
+
 	/* Belinea 10 15 55 */
 	{ "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
 	{ "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
-- 
2.17.1