gpio: tegra: read output value when gpio is set in direction_out
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 <ldewangan@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index cfd9b72..5389be8 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -134,6 +134,11 @@
static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
{
+ /* If gpio is in output mode then read from the out value */
+ if ((tegra_gpio_readl(GPIO_OE(offset)) >> GPIO_BIT(offset)) & 1)
+ return (tegra_gpio_readl(GPIO_OUT(offset)) >>
+ GPIO_BIT(offset)) & 0x1;
+
return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
}