diff options
Diffstat (limited to 'src/lib/gpio.c')
| -rw-r--r-- | src/lib/gpio.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/lib/gpio.c b/src/lib/gpio.c index 3f3ae60d91..801a3b3b9c 100644 --- a/src/lib/gpio.c +++ b/src/lib/gpio.c @@ -114,6 +114,12 @@ uint32_t _gpio_base3_value(const gpio_t gpio[], int num_gpio, int binary_first) printk(BIOS_DEBUG, "%c ", tristate_char[temp]); result = (result * 3) + temp; + /* Disable pull to avoid wasting power. For HiZ we leave the + pull-down enabled, since letting them float freely back and + forth may waste power in the SoC's GPIO input logic. */ + if (temp != Z) + gpio_input(gpio[index]); + /* * For binary_first we keep track of the normal ternary result * and whether we found any pin that was a Z. We also determine @@ -159,10 +165,6 @@ uint32_t _gpio_base3_value(const gpio_t gpio[], int num_gpio, int binary_first) printk(BIOS_DEBUG, "= %d (%s base3 number system)\n", result, binary_first ? "binary_first" : "standard"); - /* Disable pull up / pull down to conserve power */ - for (index = 0; index < num_gpio; ++index) - gpio_input(gpio[index]); - return result; } |