android/android_kernel_asus_sm8350
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pinctrl: as3722: fix handling of GPIO invert bit

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The AS3722_GPIO_INV bit will always be blindly overwritten by
as3722_pinctrl_gpio_set_direction() and will be ignored when
setting the value of the GPIO in as3722_gpio_set() since the
enable_gpio_invert flag is never set.  This will cause an
initially inverted GPIO to toggle when requested as an output,
which could be problematic if, for example, the GPIO controls
a critical regulator.

Instead of setting up the enable_gpio_invert flag, just leave
the invert bit alone and check it before setting the GPIO value.

Cc: <stable@vger.kernel.org> # v3.14+
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andrew Bresticker 2014-04-16 13:40:17 -07:00 committed by Linus Walleij
parent 4c5fba3d4a
commit a73d2e30b4
1 changed files with 11 additions and 6 deletions
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17
drivers/pinctrl/pinctrl-as3722.c
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@ -64,7 +64,6 @@ struct as3722_pin_function {
};
struct as3722_gpio_pin_control {
bool enable_gpio_invert;
unsigned mode_prop;
int io_function;
};
@ -320,10 +319,8 @@ static int as3722_pinctrl_gpio_set_direction(struct pinctrl_dev *pctldev,
return mode;
}
if (as_pci->gpio_control[offset].enable_gpio_invert)
mode |= AS3722_GPIO_INV;
return as3722_write(as3722, AS3722_GPIOn_CONTROL_REG(offset), mode);
return as3722_update_bits(as3722, AS3722_GPIOn_CONTROL_REG(offset),
AS3722_GPIO_MODE_MASK, mode);
}
static const struct pinmux_ops as3722_pinmux_ops = {
@ -496,10 +493,18 @@ static void as3722_gpio_set(struct gpio_chip *chip, unsigned offset,
{
struct as3722_pctrl_info *as_pci = to_as_pci(chip);
struct as3722 *as3722 = as_pci->as3722;
int en_invert = as_pci->gpio_control[offset].enable_gpio_invert;
int en_invert;
u32 val;
int ret;
ret = as3722_read(as3722, AS3722_GPIOn_CONTROL_REG(offset), &val);
if (ret < 0) {
dev_err(as_pci->dev,
"GPIO_CONTROL%d_REG read failed: %d\n", offset, ret);
return;
}
en_invert = !!(val & AS3722_GPIO_INV);
if (value)
val = (en_invert) ? 0 : AS3722_GPIOn_SIGNAL(offset);
else