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Commit 5f629ad7 authored by Ben Dooks's avatar Ben Dooks Committed by Greg Kroah-Hartman
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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: default avatarBen Dooks <ben-linux@fluff.org>
Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 8802bca4

drivers/usb/gadget/s3c2410_udc.c

+4 −0
Original line number Diff line number Diff line
@@ -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;