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b=OT9/RdsiQLo53JBhT5e/js0LbO9+bKfoLyeKmu1l1S5RWq7BNTiiAGpKl6WJA3s6Xx0qLaplH+Ec36cSwAFNTF0Heb5EPctRiO5PrEhxrX5t6vVeEa3HGPdz+s31gi3Sn8CO2n6ObrBh0TPKX/uIpFGYXN+g6LGz1NL7tOKG1o0= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) by VI1PR04MB10001.eurprd04.prod.outlook.com (2603:10a6:800:1d9::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7228.22; Wed, 24 Jan 2024 15:25:52 +0000 Received: from PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c]) by PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c%3]) with mapi id 15.20.7202.035; Wed, 24 Jan 2024 15:25:51 +0000 From: Frank Li To: thinh.nguyen@synopsys.com Cc: Frank.Li@nxp.com, balbi@kernel.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, mark.rutland@arm.com, mathias.nyman@intel.com, pku.leo@gmail.com, ran.wang_1@nxp.com, robh+dt@kernel.org, sergei.shtylyov@cogentembedded.com Subject: [PATCH v4 3/3] usb: dwc3: Add workaround for host mode VBUS glitch when boot Date: Wed, 24 Jan 2024 10:25:25 -0500 Message-Id: <20240124152525.3910311-4-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240124152525.3910311-1-Frank.Li@nxp.com> References: <20240124152525.3910311-1-Frank.Li@nxp.com> X-ClientProxiedBy: BY5PR04CA0017.namprd04.prod.outlook.com (2603:10b6:a03:1d0::27) To PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9642:EE_|VI1PR04MB10001:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d266023-b713-45d0-e134-08dc1cf0bfdd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9d266023-b713-45d0-e134-08dc1cf0bfdd X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9642.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jan 2024 15:25:51.8455 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3MWDFmdq9WBm7GrrAawHT+KmfP7yyJZ1BNIt5RzdQGi2z/7ZTXppQ5XBSIxCF5S82aO7lvACUU87FNqmokE2qA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB10001 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788986067586607662 X-GMAIL-MSGID: 1788986067586607662 From: Ran Wang When DWC3 is set to host mode by programming register DWC3_GCTL, VBUS (or its control signal) will be turned on immediately on related Root Hub ports. Then, the VBUS is turned off for a little while(15us) when do xhci reset (conducted by xhci driver) and back to normal finally, we can observe a negative glitch of related signal happen. This VBUS glitch might cause some USB devices enumeration fail if kernel boot with them connected. Such as LS1012AFWRY/LS1043ARDB/LX2160AQDS /LS1088ARDB with Kingston 16GB USB2.0/Kingston USB3.0/JetFlash Transcend 4GB USB2.0 drives. The fail cases include enumerated as full-speed device or report wrong device descriptor, etc. One SW workaround which can fix this is by programing all xhci PORTSC[PP] to 0 to turn off VBUS immediately after setting host mode in DWC3 driver (per signal measurement result, it will be too late to do it in xhci-plat.c or xhci.c). Then, after xhci reset complete in xhci driver, PORTSC[PP]s' value will back to 1 automatically and VBUS on at that time, no glitch happen and normal enumeration process has no impact. Acked-by: Thinh Nguyen Signed-off-by: Ran Wang Reviewed-by: Peter Chen Signed-off-by: Frank Li --- Notes: Chang from v3 to v4 - fix kernel-doc comments. - fix ./script/kernel-doc check error. - Add Thinh's ACK tag Change from v2 to v3 - reversed christmas tree - please move major change hunk to the top - Reword "We have to ..." to "Some platforms need to ... " Change from v1 to v2: - split xhci.h Last review at June 06, 2019. Fixed all review comments and sent again. https://lore.kernel.org/linux-kernel/AM5PR0402MB2865979E26017BC5937DBBA5F1170@AM5PR0402MB2865.eurprd04.prod.outlook.com/ drivers/usb/dwc3/core.c | 3 +++ drivers/usb/dwc3/core.h | 2 ++ drivers/usb/dwc3/host.c | 51 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 56 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 3e55838c00014..3b68e8e45b8b9 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1626,6 +1626,9 @@ static void dwc3_get_properties(struct dwc3 *dwc) dwc->dis_split_quirk = device_property_read_bool(dev, "snps,dis-split-quirk"); + dwc->host_vbus_glitches_quirk = device_property_read_bool(dev, + "snps,host-vbus-glitches-quirk"); + dwc->lpm_nyet_threshold = lpm_nyet_threshold; dwc->tx_de_emphasis = tx_de_emphasis; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index e3eea965e57bf..df544ec730d22 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1132,6 +1132,7 @@ struct dwc3_scratchpad_array { * 2 - No de-emphasis * 3 - Reserved * @dis_metastability_quirk: set to disable metastability quirk. + * @host_vbus_glitches_quirk: set to avoid vbus glitch during xhci reset. * @dis_split_quirk: set to disable split boundary. * @wakeup_configured: set if the device is configured for remote wakeup. * @suspended: set to track suspend event due to U3/L2. @@ -1353,6 +1354,7 @@ struct dwc3 { unsigned tx_de_emphasis:2; unsigned dis_metastability_quirk:1; + unsigned host_vbus_glitches_quirk:1; unsigned dis_split_quirk:1; unsigned async_callbacks:1; diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c index 61f57fe5bb783..4957b9765dc56 100644 --- a/drivers/usb/dwc3/host.c +++ b/drivers/usb/dwc3/host.c @@ -11,8 +11,52 @@ #include #include +#include "../host/xhci-port.h" +#include "../host/xhci-ext-caps.h" +#include "../host/xhci-caps.h" #include "core.h" +#define XHCI_HCSPARAMS1 0x4 +#define XHCI_PORTSC_BASE 0x400 + +/** + * dwc3_power_off_all_roothub_ports - Power off all Root hub ports + * @dwc: Pointer to our controller context structure + */ +static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc) +{ + void __iomem *xhci_regs; + u32 op_regs_base; + int port_num; + u32 offset; + u32 reg; + int i; + + /* xhci regs is not mapped yet, do it temperary here */ + if (dwc->xhci_resources[0].start) { + xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END); + if (IS_ERR(xhci_regs)) { + dev_err(dwc->dev, "Failed to ioremap xhci_regs\n"); + return; + } + + op_regs_base = HC_LENGTH(readl(xhci_regs)); + reg = readl(xhci_regs + XHCI_HCSPARAMS1); + port_num = HCS_MAX_PORTS(reg); + + for (i = 1; i <= port_num; i++) { + offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1); + reg = readl(xhci_regs + offset); + reg &= ~PORT_POWER; + writel(reg, xhci_regs + offset); + } + + iounmap(xhci_regs); + } else { + dev_err(dwc->dev, "xhci base reg invalid\n"); + } +} + static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc, int irq, char *name) { @@ -66,6 +110,13 @@ int dwc3_host_init(struct dwc3 *dwc) int ret, irq; int prop_idx = 0; + /* + * Some platforms need to power off all Root hub ports immediately after DWC3 set to host + * mode to avoid VBUS glitch happen when xhci get reset later. + */ + if (dwc->host_vbus_glitches_quirk) + dwc3_power_off_all_roothub_ports(dwc); + irq = dwc3_host_get_irq(dwc); if (irq < 0) return irq;