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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.14 084/100] drm/bridge: tc358767: fix AUXDATAn
 registers access
Thread-Topic: [PATCH AUTOSEL for 4.14 084/100] drm/bridge: tc358767: fix
 AUXDATAn registers access
Thread-Index: AQHTlMnrMODhRWYF/keFJYbKNAL68g==
Date:   Wed, 24 Jan 2018 04:15:08 +0000
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From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>

[ Upstream commit 9217c1abbc145a77d65c476cf2004a3df02104c7 ]

First four bytes should go to DP0_AUXWDATA0. Due to bug if
len > 4 first four bytes was writen to DP0_AUXWDATA1 and all
data get shifted by 4 bytes. Fix it.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-6-git-=
send-email-andrey.gusakov@cogentembedded.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/gpu/drm/bridge/tc358767.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc3=
58767.c
index b916346b933a..24f495bf0567 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -318,7 +318,7 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
 				tmp =3D (tmp << 8) | buf[i];
 			i++;
 			if (((i % 4) =3D=3D 0) || (i =3D=3D size)) {
-				tc_write(DP0_AUXWDATA(i >> 2), tmp);
+				tc_write(DP0_AUXWDATA((i - 1) >> 2), tmp);
 				tmp =3D 0;
 			}
 		}
--=20
2.11.0