[patch 3/3] s3c2410 gadget: ensure vbus pin in input mode during read

[Ben Dooks <ben-linux@xxxxxxxxx>]

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 <ben-linux@xxxxxxxxx>

Index: linux-2.6.22-simtec19/drivers/usb/gadget/s3c2410_udc.c
===================================================================
--- linux-2.6.22-simtec19.orig/drivers/usb/gadget/s3c2410_udc.c
+++ linux-2.6.22-simtec19/drivers/usb/gadget/s3c2410_udc.c
@@ -1511,7 +1511,11 @@ static irqreturn_t s3c2410_udc_vbus_irq(
 	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;

-- 
Ben (ben@xxxxxxxxx, http://www.fluff.org/)

  'a smiley only costs 4 bytes'

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