linux-kernel - [PATCH 4.18 163/197] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80

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Message-Id: <20180913131848.077411947@linuxfoundation.org>
Date:   Thu, 13 Sep 2018 15:31:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 4.18 163/197] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

commit 25da75043f8690fd083878447c91f289dfb63b87 upstream.

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>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180823055332.7723-1-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/drm_edid.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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 },