* Roger Quadros <[email protected]> [131205 01:24]: > Commit 0b2aa8be introduced a regression that causes failure > in setting LED GPO direction to OUT. > > This causes USB host probe failures for Beagleboard C4. > > [ 2.075469] platform usb_phy_gen_xceiv.2: Driver usb_phy_gen_xceiv > requests probe deferral > [ 2.090454] hsusb2_vcc: Failed to request enable GPIO510: -22 > [ 2.100982] reg-fixed-voltage reg-fixed-voltage.0.auto: Failed to register > regulator: -22 > [ 2.109954] reg-fixed-voltage: probe of reg-fixed-voltage.0.auto failed > with error -22 > > direction_out/direction_in must return 0 if the operation succeeded. > > Also, don't update direction flag and output data if > twl4030_set_gpio_direction() > failed inside twl_direction_out(); > > Signed-off-by: Roger Quadros <[email protected]>
Acked-by: Tony Lindgren <[email protected]> Linus, commit 0b2aa8be is in mainline now, so feel free to pick this one up if it looks OK to you. This should be also Cc stable as 0b2aa8be has that. Regards, Tony > --- > drivers/gpio/gpio-twl4030.c | 15 ++++++++++++--- > 1 file changed, 12 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpio/gpio-twl4030.c b/drivers/gpio/gpio-twl4030.c > index b97d6a6..f999689 100644 > --- a/drivers/gpio/gpio-twl4030.c > +++ b/drivers/gpio/gpio-twl4030.c > @@ -300,7 +300,7 @@ static int twl_direction_in(struct gpio_chip *chip, > unsigned offset) > if (offset < TWL4030_GPIO_MAX) > ret = twl4030_set_gpio_direction(offset, 1); > else > - ret = -EINVAL; > + ret = -EINVAL; /* LED outputs can't be set as input */ > > if (!ret) > priv->direction &= ~BIT(offset); > @@ -354,11 +354,20 @@ static void twl_set(struct gpio_chip *chip, unsigned > offset, int value) > static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int > value) > { > struct gpio_twl4030_priv *priv = to_gpio_twl4030(chip); > - int ret = -EINVAL; > + int ret = 0; > > mutex_lock(&priv->mutex); > - if (offset < TWL4030_GPIO_MAX) > + if (offset < TWL4030_GPIO_MAX) { > ret = twl4030_set_gpio_direction(offset, 0); > + if (ret) { > + mutex_unlock(&priv->mutex); > + return ret; > + } > + } > + > + /* > + * LED gpios i.e. offset >= TWL4030_GPIO_MAX are always output > + */ > > priv->direction |= BIT(offset); > mutex_unlock(&priv->mutex); > -- > 1.8.3.2 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
