From: Ben Dooks Date: Mon, 19 Nov 2007 22:28:15 +0000 (+0000) Subject: USB: s3c2410 gadget: ensure vbus pin in input mode during read X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5f629ad7e5f9b99c6d025bf199d402734bd72d0f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git USB: s3c2410 gadget: ensure vbus pin in input mode during read Some CPUs in the S3C24XX series do not support readback of the value of a pin when the pin has been configured to an IRQ. Signed-off-by: Ben Dooks Acked-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/s3c2410_udc.c b/drivers/usb/gadget/s3c2410_udc.c index 5acaddabbe8f..4ce050c3d13f 100644 --- a/drivers/usb/gadget/s3c2410_udc.c +++ b/drivers/usb/gadget/s3c2410_udc.c @@ -1511,7 +1511,11 @@ static irqreturn_t s3c2410_udc_vbus_irq(int irq, void *_dev) unsigned int value; dprintk(DEBUG_NORMAL, "%s()\n", __func__); + + /* some cpus cannot read from an line configured to IRQ! */ + s3c2410_gpio_cfgpin(udc_info->vbus_pin, S3C2410_GPIO_INPUT); value = s3c2410_gpio_getpin(udc_info->vbus_pin); + s3c2410_gpio_cfgpin(udc_info->vbus_pin, S3C2410_GPIO_SFN2); if (udc_info->vbus_pin_inverted) value = !value;