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Fri, 15 Nov 2024 12:31:05 -0600 From: Radhey Shyam Pandey To: , , , CC: , , , , Neal Frager , Radhey Shyam Pandey Subject: [PATCH] usb: dwc3: xilinx: make sure pipe clock is deselected in usb2 only mode Date: Sat, 16 Nov 2024 00:01:00 +0530 Message-ID: <1731695460-1814409-1-git-send-email-radhey.shyam.pandey@amd.com> X-Mailer: git-send-email 2.1.1 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB05.amd.com: radhey.shyam.pandey@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002315:EE_|CY5PR12MB6598:EE_ X-MS-Office365-Filtering-Correlation-Id: d37f9438-61a2-4e2a-3676-08dd05a3ad9c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(1800799024)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Nov 2024 18:31:10.5263 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d37f9438-61a2-4e2a-3676-08dd05a3ad9c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002315.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6598 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 settings for USB2.0 mode") Signed-off-by: Neal Frager Signed-off-by: Radhey Shyam Pandey --- drivers/usb/dwc3/dwc3-xilinx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) base-commit: 744cf71b8bdfcdd77aaf58395e068b7457634b2c 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 *priv_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; + } crst = devm_reset_control_get_exclusive(dev, "usb_crst"); if (IS_ERR(crst)) {