Author: kevans
Date: Tue Dec 5 21:40:52 2017
New Revision: 326595
URL: https://svnweb.freebsd.org/changeset/base/326595
Log:
a10_gpio: Don't do read/set dance if pin is already configured for output
This fixes some regulator issues with a83t/BananaPi-M3; the pin value was
getting clobbered as we reconfigured the pin when initializing the
regulator.
Discussed with: ian
Modified:
head/sys/arm/allwinner/a10_gpio.c
Modified: head/sys/arm/allwinner/a10_gpio.c
==============================================================================
--- head/sys/arm/allwinner/a10_gpio.c Tue Dec 5 21:38:24 2017
(r326594)
+++ head/sys/arm/allwinner/a10_gpio.c Tue Dec 5 21:40:52 2017
(r326595)
@@ -353,7 +353,8 @@ a10_gpio_pin_configure(struct a10_gpio_softc *sc, uint
/* Manage input/output. */
if (flags & GPIO_PIN_INPUT) {
err = a10_gpio_set_function(sc, pin, A10_GPIO_INPUT);
- } else if (flags & GPIO_PIN_OUTPUT) {
+ } else if ((flags & GPIO_PIN_OUTPUT) &&
+ a10_gpio_get_function(sc, pin) != A10_GPIO_OUTPUT) {
if (flags & GPIO_PIN_PRESET_LOW) {
a10_gpio_pin_set_locked(sc, pin, 0);
} else if (flags & GPIO_PIN_PRESET_HIGH) {
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