diff options
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/pinctrl-baytrail.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c index 975572e2f260..701a646a3d10 100644 --- a/drivers/pinctrl/pinctrl-baytrail.c +++ b/drivers/pinctrl/pinctrl-baytrail.c @@ -44,6 +44,7 @@ /* BYT_CONF0_REG register bits */ #define BYT_IODEN BIT(31) +#define BYT_DIRECT_IRQ_EN BIT(27) #define BYT_TRIG_NEG BIT(26) #define BYT_TRIG_POS BIT(25) #define BYT_TRIG_LVL BIT(24) @@ -303,12 +304,22 @@ static int byt_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value) { struct byt_gpio *vg = to_byt_gpio(chip); + void __iomem *conf_reg = byt_gpio_reg(chip, gpio, BYT_CONF0_REG); void __iomem *reg = byt_gpio_reg(chip, gpio, BYT_VAL_REG); unsigned long flags; u32 reg_val; spin_lock_irqsave(&vg->lock, flags); + /* + * Before making any direction modifications, do a check if gpio + * is set for direct IRQ. On baytrail, setting GPIO to output does + * not make sense, so let's at least warn the caller before they shoot + * themselves in the foot. + */ + WARN(readl(conf_reg) & BYT_DIRECT_IRQ_EN, + "Potential Error: Setting GPIO with direct_irq_en to output"); + reg_val = readl(reg) | BYT_DIR_MASK; reg_val &= ~BYT_OUTPUT_EN; |