diff options
Diffstat (limited to 'chip/lm4/gpio.c')
| -rw-r--r-- | chip/lm4/gpio.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/chip/lm4/gpio.c b/chip/lm4/gpio.c index 54ab546f00..cb08533413 100644 --- a/chip/lm4/gpio.c +++ b/chip/lm4/gpio.c @@ -184,14 +184,18 @@ int gpio_set_flags(enum gpio_signal signal, int flags) if (flags & GPIO_OUTPUT) { /* Output */ - LM4_GPIO_DIR(g->port) |= g->mask; - + /* Select open drain first, so that we don't glitch the signal + * when changing the line to an output. */ if (g->flags & GPIO_OPEN_DRAIN) LM4_GPIO_ODR(g->port) |= g->mask; else LM4_GPIO_ODR(g->port) &= ~g->mask; + + LM4_GPIO_DIR(g->port) |= g->mask; } else { /* Input */ + LM4_GPIO_DIR(g->port) &= ~g->mask; + if (g->flags & GPIO_PULL) { /* With pull up/down */ if (g->flags & GPIO_HIGH) |