From: Tony Lindgren Date: Mon, 18 Nov 2013 23:22:49 +0000 (-0800) Subject: gpio: twl4030: Fix regression for twl gpio output X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0b2aa8be;p=linux-beck.git gpio: twl4030: Fix regression for twl gpio output Commit c111feabe2e2 (gpio: twl4030: Cache the direction and output states in private data) improved things in general, but caused a regression for setting the GPIO output direction. The change reorganized twl_direction_out() and twl_set() and swapped the function names around in the process. While doing that, a bug got introduced that's not obvious while reading the patch as it appears as no change to the code. The bug is we now call function twl4030_set_gpio_dataout() twice in both twl_direction_out() and twl_set(). Instead, we should first call twl_direction_out() in twl_direction_out() followed by twl4030_set_gpio_dataout() in twl_set(). This regression probably has gone unnoticed for a long time as the bootloader may have set the GPIO direction properly in many cases. This fixes at least the LCD panel not turning on omap3 LDP for example. Cc: linux-gpio@vger.kernel.org Cc: stable@vger.kernel.org #v3.9+ Reviewed-by: Peter Ujfalusi Acked-by: Linus Walleij Signed-off-by: Tony Lindgren --- diff --git a/drivers/gpio/gpio-twl4030.c b/drivers/gpio/gpio-twl4030.c index 0c7e891c8651..5738d5a7d849 100644 --- a/drivers/gpio/gpio-twl4030.c +++ b/drivers/gpio/gpio-twl4030.c @@ -354,17 +354,18 @@ static void twl_set(struct gpio_chip *chip, unsigned offset, int value) static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value) { struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip); + int ret = -EINVAL; mutex_lock(&priv->mutex); if (offset < TWL4030_GPIO_MAX) - twl4030_set_gpio_dataout(offset, value); + ret = twl4030_set_gpio_direction(offset, 0); priv->direction |= BIT(offset); mutex_unlock(&priv->mutex); twl_set(chip, offset, value); - return 0; + return ret; } static int twl_to_irq(struct gpio_chip *chip, unsigned offset)