au1000: fix gpio output

when setting the output state of one GPIO pin we have to keep the state of the
other pins, hence use binary OR. also gpio_direction_output() wants to set an
initial value, so add that too.

this fixes a problem with the USB power switch on mtx-1 boards. (#3974)

Signed-off-by: Bruno Randolf <br1@einfach.org>

SVN-Revision: 12561

target/linux/au1000/patches/017-gpio-dir.patch

@@ -0,0 +1,20 @@
+--- linux-2.6.25.16/arch/mips/au1000/common/gpio.c.org	2008-09-04 22:32:12.000000000 +0200
++++ linux-2.6.25.16/arch/mips/au1000/common/gpio.c	2008-09-04 23:10:18.000000000 +0200
+@@ -66,7 +66,8 @@
+ static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
+ {
+ 	gpio -= AU1XXX_GPIO_BASE;
+-	gpio2->dir = (0x01 << gpio) | (value << gpio);
++	gpio2->dir |= 0x01 << gpio;
++	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
+ 	return 0;
+ }
+ 
+@@ -95,6 +96,7 @@
+ static int au1xxx_gpio1_direction_output(unsigned gpio, int value)
+ {
+ 	gpio1->trioutclr = (0x01 & gpio);
++	au1xxx_gpio1_write(gpio, value);
+ 	return 0;
+ }
+