MIPS: BCM63xx: Initialize gpio_out_low & out_high to current value at boot.

To avoid a glitch during GPIO initialisation read GPIO output register
values left by the firmware.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/903/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/bcm63xx/gpio.c b/arch/mips/bcm63xx/gpio.c
index 37253452d396..315bc7f79ce1 100644
--- a/arch/mips/bcm63xx/gpio.c
+++ b/arch/mips/bcm63xx/gpio.c
@@ -125,6 +125,8 @@ static struct gpio_chip bcm63xx_gpio_chip = {
 
 int __init bcm63xx_gpio_init(void)
 {
+        gpio_out_low = bcm_gpio_readl(GPIO_DATA_LO_REG);
+        gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
         bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
         pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);