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Wed, 16 Sep 2020 12:31:28 +0000 From: peng.fan@nxp.com To: sbabic@denx.de, marex@denx.de Cc: uboot-imx@nxp.com, u-boot@lists.denx.de, Ye Li , Peter Chen , Peng Fan Subject: [PATCH 09/13] usb: ehci-mx6: Fix USB QTD data buffer error Date: Wed, 16 Sep 2020 20:57:01 +0800 Message-Id: <20200916125705.4341-10-peng.fan@nxp.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200916125705.4341-1-peng.fan@nxp.com> References: <20200916125705.4341-1-peng.fan@nxp.com> X-ClientProxiedBy: SGBP274CA0023.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::35) To DB6PR0402MB2760.eurprd04.prod.outlook.com (2603:10a6:4:a1::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from linux-1xn6.ap.freescale.net (119.31.174.71) by SGBP274CA0023.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3391.13 via Frontend Transport; Wed, 16 Sep 2020 12:31:26 +0000 X-Mailer: git-send-email 2.28.0 X-Originating-IP: [119.31.174.71] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: c3102c12-f348-4349-46b7-08d85a3c6f61 X-MS-TrafficTypeDiagnostic: DB3PR0402MB3915: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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The root cause is last QTD reports data buffer error. Accroding to RM, this event indicates that an overrun of incoming data or a underrun of outgoing data has occurred for this transaction. This would generally be caused by the host controller not being able to access required data buffers in memory within necessary latency requirements. Follow kernel's method to fix the issue by disabling stream mode Signed-off-by: Ye Li Reviewed-by: Peter Chen Signed-off-by: Peng Fan --- drivers/usb/host/ehci-mx6.c | 9 +++++++++ 1 file changed, 9 insertions(+) -- 2.28.0 diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c index de0b0c3156..aa0c1c355d 100644 --- a/drivers/usb/host/ehci-mx6.c +++ b/drivers/usb/host/ehci-mx6.c @@ -488,6 +488,11 @@ int ehci_hcd_init(int index, enum usb_init_type init, board_ehci_power(index, (type == USB_INIT_DEVICE) ? 0 : 1); if (type != init) return -ENODEV; + + if (is_mx6dqp() || is_mx6dq() || is_mx6sdl() || + ((is_mx6sl() || is_mx6sx()) && type == USB_INIT_HOST)) + setbits_le32(&ehci->usbmode, SDIS); + if (type == USB_INIT_DEVICE) return 0; @@ -542,6 +547,10 @@ static int mx6_init_after_reset(struct ehci_ctrl *dev) } #endif + if (is_mx6dqp() || is_mx6dq() || is_mx6sdl() || + ((is_mx6sl() || is_mx6sx()) && type == USB_INIT_HOST)) + setbits_le32(&ehci->usbmode, SDIS); + if (type == USB_INIT_DEVICE) return 0;