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Mon, 2 Sep 2024 11:09:16 +0000 From: Pawel Laszczak To: "gregkh@linuxfoundation.org" CC: "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , Pawel Laszczak Subject: [PATCH] usb: cdns2: Fix controller reset issue Thread-Topic: [PATCH] usb: cdns2: Fix controller reset issue Thread-Index: AQHa/Sf9GoZsP2bLJ0yREBk1yvkY8rJEVeVA Date: Mon, 2 Sep 2024 11:09:16 +0000 Message-ID: References: <20240902110422.157569-1-pawell@cadence.com> In-Reply-To: <20240902110422.157569-1-pawell@cadence.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-dg-ref: PG1ldGE+PGF0IGFpPSIwIiBubT0iYm9keS50eHQiIHA9ImM6XHVzZXJzXHBhd2VsbFxhcHBkYXRhXHJvYW1pbmdcMDlkODQ5YjYtMzJkMy00YTQwLTg1ZWUtNmI4NGJhMjllMzViXG1zZ3NcbXNnLWM5ODQ3OGRkLTY5MWItMTFlZi1hOGI0LTYwYTVlMjViOTZhM1xhbWUtdGVzdFxjOTg0NzhkZi02OTFiLTExZWYtYThiNC02MGE1ZTI1Yjk2YTNib2R5LnR4dCIgc3o9IjQ4NDAiIHQ9IjEzMzY5NzQ4OTU0Nzg0NzIyMCIgaD0iSGRsc2FTWUNjbXo5azZTQktqUHNDT1o3WlVjPSIgaWQ9IiIgYmw9IjAiIGJvPSIxIi8+PC9tZXRhPg== x-dg-rorf: true x-ms-publictraffictype: Email x-ms-traffictypediagnostic: PH7PR07MB9538:EE_|BL4PR07MB10452:EE_ x-ms-office365-filtering-correlation-id: 1a577e9d-7b58-4b73-1397-08dccb3faf5f x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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The CPUCTRL register is write only and reading returns 0. Waiting for reset to complite is incorrect. Fixes: 3eb1f1efe204 ("usb: cdns2: Add main part of Cadence USBHS driver") cc: Signed-off-by: Pawel Laszczak --- drivers/usb/gadget/udc/cdns2/cdns2-gadget.c | 12 +++--------- drivers/usb/gadget/udc/cdns2/cdns2-gadget.h | 9 +++++++++ 2 files changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c index 0eed0e03842c..d394affb7072 100644 --- a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c +++ b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.c @@ -2251,7 +2251,6 @@ static int cdns2_gadget_start(struct cdns2_device *pdev) { u32 max_speed; void *buf; - int val; int ret; pdev->usb_regs = pdev->regs; @@ -2261,14 +2260,9 @@ static int cdns2_gadget_start(struct cdns2_device *pdev) pdev->adma_regs = pdev->regs + CDNS2_ADMA_REGS_OFFSET; /* Reset controller. */ - set_reg_bit_8(&pdev->usb_regs->cpuctrl, CPUCTRL_SW_RST); - - ret = readl_poll_timeout_atomic(&pdev->usb_regs->cpuctrl, val, - !(val & CPUCTRL_SW_RST), 1, 10000); - if (ret) { - dev_err(pdev->dev, "Error: reset controller timeout\n"); - return -EINVAL; - } + writeb(CPUCTRL_SW_RST | CPUCTRL_UPCLK | CPUCTRL_WUEN, + &pdev->usb_regs->cpuctrl); + usleep_range(5, 10); usb_initialize_gadget(pdev->dev, &pdev->gadget, NULL); diff --git a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.h b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.h index 71e2f62d653a..b5d5ec12e986 100644 --- a/drivers/usb/gadget/udc/cdns2/cdns2-gadget.h +++ b/drivers/usb/gadget/udc/cdns2/cdns2-gadget.h @@ -292,8 +292,17 @@ struct cdns2_usb_regs { #define SPEEDCTRL_HSDISABLE BIT(7) /* CPUCTRL- bitmasks. */ +/* UP clock enable */ +#define CPUCTRL_UPCLK BIT(0) /* Controller reset bit. */ #define CPUCTRL_SW_RST BIT(1) +/** + * If the wuen bit is ‘1’, the upclken is automatically set to ‘1’ after + * detecting rising edge of wuintereq interrupt. If the wuen bit is ‘0’, + * the wuintereq interrupt is ignored. + */ +#define CPUCTRL_WUEN BIT(7) + /** * struct cdns2_adma_regs - ADMA controller registers.