Read the output value when gpio is set for the output mode for gpio_get_value(). Reading input value in direction out does not give correct value.
Signed-off-by: Laxman Dewangan <ldewan...@nvidia.com> --- drivers/gpio/gpio-tegra.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c index c7c175a..0fb2ce7 100644 --- a/drivers/gpio/gpio-tegra.c +++ b/drivers/gpio/gpio-tegra.c @@ -135,6 +135,12 @@ static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value) static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset) { + int bit_val = BIT(GPIO_BIT(offset)); + + /* If gpio is in output mode then read from the out value */ + if (tegra_gpio_readl(GPIO_OE(offset)) & bit_val) + return !!(tegra_gpio_readl(GPIO_OUT(offset)) & bit_val); + return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1; } -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/