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Date: Fri, 2 Feb 2018 17:58:11 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>,
Andrey Gusakov <andrey.gusakov@...entembedded.com>,
Andrzej Hajda <a.hajda@...sung.com>,
Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 110/156] drm/bridge: tc358767: fix AUXDATAn registers access
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrey Gusakov <andrey.gusakov@...entembedded.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@...gutronix.de>
Signed-off-by: Andrey Gusakov <andrey.gusakov@...entembedded.com>
Signed-off-by: Andrzej Hajda <a.hajda@...sung.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@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpu/drm/bridge/tc358767.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 dr
tmp = (tmp << 8) | buf[i];
i++;
if (((i % 4) == 0) || (i == size)) {
- tc_write(DP0_AUXWDATA(i >> 2), tmp);
+ tc_write(DP0_AUXWDATA((i - 1) >> 2), tmp);
tmp = 0;
}
}
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