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pch_gpio: set value before enabling output direction

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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>
This commit is contained in:
Daniel Krueger 2014-03-25 10:32:47 +01:00 committed by Linus Walleij
parent fc860356ac
commit 2ddf6cd67c
1 changed files with 5 additions and 3 deletions
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8
drivers/gpio/gpio-pch.c
View file

@ -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;