From: Laxman Dewangan Date: Fri, 9 Nov 2012 06:04:20 +0000 (+0530) Subject: gpio: tegra: read output value when gpio is set in direction_out X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=195812e4b6a631e8eaad4046bf6890db4328ea1f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Acked-by: Stephen Warren Signed-off-by: Linus Walleij --- diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c index cfd9b723002b..5389be8c2b51 100644 --- a/drivers/gpio/gpio-tegra.c +++ b/drivers/gpio/gpio-tegra.c @@ -134,6 +134,11 @@ static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 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; }