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authorDaniel Krueger <daniel.krueger@systec-electronic.com>2014-03-25 10:32:47 +0100
committerLinus Walleij <linus.walleij@linaro.org>2014-03-27 10:20:29 +0100
commit2ddf6cd67cc561e40454d60126a8a7cb32f3328f (patch)
tree1a295940e4075d56fd9a80328ac987678ce3cae7 /drivers/gpio/gpio-pch.c
parentfc860356aca3dd7cd3eed74ede29a84c55992d27 (diff)
downloadlinux-2ddf6cd67cc561e40454d60126a8a7cb32f3328f.tar.bz2
pch_gpio: set value before enabling output direction
This ensures that the output signal does not toggle if set to high. Signed-off-by: Daniel Krueger <daniel.krueger@systec-electronic.com> Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pch.c')
-rw-r--r--drivers/gpio/gpio-pch.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index 9656c196772e..83a156397474 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -138,9 +138,6 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
unsigned long flags;
spin_lock_irqsave(&chip->spinlock, flags);
- pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
- pm |= (1 << nr);
- iowrite32(pm, &chip->reg->pm);
reg_val = ioread32(&chip->reg->po);
if (val)
@@ -148,6 +145,11 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
else
reg_val &= ~(1 << nr);
iowrite32(reg_val, &chip->reg->po);
+
+ pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
+ pm |= (1 << nr);
+ iowrite32(pm, &chip->reg->pm);
+
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;