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Tue, 7 Sep 2021 08:26:55 +0200 Received: from maileu3.global.cadence.com (10.160.88.99) by maileu5.global.cadence.com (10.160.110.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2176.2; Tue, 7 Sep 2021 08:26:42 +0200 Received: from gli-login.cadence.com (10.187.128.100) by maileu3.global.cadence.com (10.160.88.99) with Microsoft SMTP Server (TLS) id 15.0.1497.2 via Frontend Transport; Tue, 7 Sep 2021 08:26:42 +0200 Received: from gli-login.cadence.com (localhost [127.0.0.1]) by gli-login.cadence.com (8.14.4/8.14.4) with ESMTP id 1876QgD6035274; Tue, 7 Sep 2021 08:26:42 +0200 Received: (from pawell@localhost) by gli-login.cadence.com (8.14.4/8.14.4/Submit) id 1876Qe3w035272; Tue, 7 Sep 2021 08:26:40 +0200 From: Pawel Laszczak To: CC: , , , , , , , Subject: [PATCH] usb: cdns3: fix race condition before setting doorbell Date: Tue, 7 Sep 2021 08:26:19 +0200 Message-ID: <20210907062619.34622-1-pawell@gli-login.cadence.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8536f0ba-d0ee-4994-21be-08d971c87ee5 X-MS-TrafficTypeDiagnostic: CY4PR0701MB3697: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; 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SFV:NSPM; H:rmmaillnx1.cadence.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(4636009)(396003)(39860400002)(136003)(376002)(346002)(36092001)(46966006)(36840700001)(42186006)(82740400003)(54906003)(4326008)(8676002)(81166007)(356005)(316002)(36906005)(2906002)(86362001)(47076005)(1076003)(6916009)(426003)(70586007)(36860700001)(478600001)(336012)(6666004)(70206006)(26005)(5660300002)(82310400003)(186003)(8936002)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Sep 2021 06:26:58.4826 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8536f0ba-d0ee-4994-21be-08d971c87ee5 X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9; Ip=[199.43.4.23]; Helo=[rmmaillnx1.cadence.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM12FT005.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR0701MB3697 X-Proofpoint-GUID: qotqagHM0jSSMQwMFtuaHhuIRUAoXJp9 X-Proofpoint-ORIG-GUID: qotqagHM0jSSMQwMFtuaHhuIRUAoXJp9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1, Aquarius:18.0.790, Hydra:6.0.391, FMLib:17.0.607.475 definitions=2021-09-07_02,2021-09-03_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 adultscore=0 clxscore=1011 impostorscore=0 priorityscore=1501 malwarescore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=701 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2108310000 definitions=main-2109070042 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Pawel Laszczak For DEV_VER_V3 version there exist race condition between clearing ep_sts.EP_STS_TRBERR and setting ep_cmd.EP_CMD_DRDY bit. Setting EP_CMD_DRDY will be ignored by controller when EP_STS_TRBERR is set. So, between these two instructions we have a small time gap in which the EP_STSS_TRBERR can be set. In such case the transfer will not start after setting doorbell. Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") cc: # 5.12.x Signed-off-by: Pawel Laszczak --- drivers/usb/cdns3/cdns3-gadget.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index 80aaab159e58..e9769fab21ea 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -1100,6 +1100,19 @@ static int cdns3_ep_run_stream_transfer(struct cdns3_endpoint *priv_ep, return 0; } +static void cdns3_rearm_drdy_if_needed(struct cdns3_endpoint *priv_ep) +{ + struct cdns3_device *priv_dev = priv_ep->cdns3_dev; + + if (priv_dev->dev_ver < DEV_VER_V3) + return; + + if (readl(&priv_dev->regs->ep_sts) & EP_STS_TRBERR) { + writel(EP_STS_TRBERR, &priv_dev->regs->ep_sts); + writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); + } +} + /** * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware * @priv_ep: endpoint object @@ -1351,6 +1364,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep, /*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/ writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts); writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); + cdns3_rearm_drdy_if_needed(priv_ep); trace_cdns3_doorbell_epx(priv_ep->name, readl(&priv_dev->regs->ep_traddr)); }