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Tue, 23 Jan 2018 23:36:26 -0500 Received: from mail-by2nam03on0127.outbound.protection.outlook.com ([104.47.42.127]:16377 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932473AbeAXESl (ORCPT ); Tue, 23 Jan 2018 23:18:41 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Andrey Gusakov , Andrzej Hajda , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 44/55] drm/bridge: tc358767: fix AUXDATAn registers access Thread-Topic: [PATCH AUTOSEL for 4.9 44/55] drm/bridge: tc358767: fix AUXDATAn registers access Thread-Index: AQHTlMoFrTD1gFBRTk64djOoMD75nA== Date: Wed, 24 Jan 2018 04:15:52 +0000 Message-ID: <20180124041521.32223-44-alexander.levin@microsoft.com> References: <20180124041521.32223-1-alexander.levin@microsoft.com> In-Reply-To: <20180124041521.32223-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1032;7:AiUBefqkeqxha5Kucya3uLLf9CI+rYDxnq7R2DZR+kGV+MX/Azn4taekbqCz0fWn4Da0dvl1w7eWkLlk7U39JMoR0dH65BNOpkSDJhGOKrGZe/8LId+326AVR5L2v0kV4yUOIgawx090Uf0Ah1bJ+CMPPsHd9v4+dip2DRJTUTyo0OBfU+Tx6ATKjCY82JwRQ3TbnS61kgNDtEzG9uxS9R/RSKK+o84NNvF5GjGo48QT2RLNNRSzPQ8j8rXJnCDH x-ms-office365-filtering-correlation-id: 03fd3824-204e-4007-dc50-08d562e18b57 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(2017052603307)(7193020);SRVR:DM5PR2101MB1032; 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authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: iEVTQoA46Ogjmp5vgoC0q+Nir3R9fmT7TZ5gC5KRha2DvFn5tIvwccICoScYnPlBlYp5rGXf2himyfo7v95YNQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 03fd3824-204e-4007-dc50-08d562e18b57 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2018 04:15:52.5953 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1032 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Andrey Gusakov [ 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 Signed-off-by: Andrey Gusakov Signed-off-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-6-git-= send-email-andrey.gusakov@cogentembedded.com Signed-off-by: Sasha Levin --- 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 821b93f68eef..6d0772864935 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