From 04c79cbd5f8f773aa7823feec6e77862e7e6426f Mon Sep 17 00:00:00 2001 From: Dirk Behme Date: Mon, 15 Jul 2013 15:58:27 +0200 Subject: [PATCH] mxc_gpio: Correct the GPIO handling in gpio_direction_output() Setting the direction and an output value should be done by First, set the desired output value. Then, switch to output. If this is done in the inverse order, like at the moment, there can be a glitch on the GPIO line while switching first the old output value and aftwards the new one. Fix this by inverting the order of the direction/set_value calls. Signed-off-by: Dirk Behme Acked-by: Stefano Babic --- drivers/gpio/mxc_gpio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c index a3880641f0a..1d820d4c3ef 100644 --- a/drivers/gpio/mxc_gpio.c +++ b/drivers/gpio/mxc_gpio.c @@ -143,10 +143,10 @@ int gpio_direction_input(unsigned gpio) int gpio_direction_output(unsigned gpio, int value) { - int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT); + int ret = gpio_set_value(gpio, value); if (ret < 0) return ret; - return gpio_set_value(gpio, value); + return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT); }