openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Laxman Dewangan 2012-11-09 11:34:20 +05:30 committed by Linus Walleij
parent ed32620ea7
commit 195812e4b6
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpio/gpio-tegra.c
View File

@ -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;
}