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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.12 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.12; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.12) by SN1PEPF0002BA4E.mail.protection.outlook.com (10.167.242.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8158.14 via Frontend Transport; Mon, 18 Nov 2024 15:08:30 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 18 Nov 2024 09:08:28 -0600 Received: from xhdradheys41.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Mon, 18 Nov 2024 09:08:25 -0600 From: Radhey Shyam Pandey To: , , , CC: , , , , Neal Frager , , Radhey Shyam Pandey Subject: [PATCH v2] usb: dwc3: xilinx: make sure pipe clock is deselected in usb2 only mode Date: Mon, 18 Nov 2024 20:38:11 +0530 Message-ID: <1731942491-1992368-1-git-send-email-radhey.shyam.pandey@amd.com> X-Mailer: git-send-email 2.1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB03.amd.com: radhey.shyam.pandey@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002BA4E:EE_|LV2PR12MB5968:EE_ X-MS-Office365-Filtering-Correlation-Id: 640baccf-39e5-4184-66da-08dd07e2dcc4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|36860700013|1800799024; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Nov 2024 15:08:30.3403 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 640baccf-39e5-4184-66da-08dd07e2dcc4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.12];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA4E.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5968 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Neal Frager When the USB3 PHY is not defined in the Linux device tree, there could still be a case where there is a USB3 PHY is active on the board and enabled by the first stage bootloader. If serdes clock is being used then the USB will fail to enumerate devices in 2.0 only mode. To solve this, make sure that the PIPE clock is deselected whenever the USB3 PHY is not defined and guarantees that the USB2 only mode will work in all cases. Fixes: 9678f3361afc ("usb: dwc3: xilinx: Skip resets and USB3 register sett= ings for USB2.0 mode") Cc: stable@vger.kernel.org Signed-off-by: Neal Frager Signed-off-by: Radhey Shyam Pandey Acked-by: Peter Korsgaard --- Changes for v2: - Add stable@vger.kernel.org in CC. --- drivers/usb/dwc3/dwc3-xilinx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c index e3738e1610db..a33a42ba0249 100644 --- a/drivers/usb/dwc3/dwc3-xilinx.c +++ b/drivers/usb/dwc3/dwc3-xilinx.c @@ -121,8 +121,11 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *pri= v_data) * in use but the usb3-phy entry is missing from the device tree. * Therefore, skip these operations in this case. */ - if (!priv_data->usb3_phy) + if (!priv_data->usb3_phy) { + /* Deselect the PIPE Clock Select bit in FPD PIPE Clock register */ + writel(PIPE_CLK_DESELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK); goto skip_usb3_phy; + } =20 crst =3D devm_reset_control_get_exclusive(dev, "usb_crst"); if (IS_ERR(crst)) { base-commit: 744cf71b8bdfcdd77aaf58395e068b7457634b2c --=20 2.34.1