diff options
| author | Felix Held <felix-coreboot@felixheld.de> | 2021-01-05 00:17:56 +0100 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-01-06 17:20:58 +0000 |
| commit | 15dd9b89962a184cba4974c571960fe468f2a103 (patch) | |
| tree | 69b56b9eba6a737a38a221629f9d1953fd09259e /src/soc/amd/common/block/gpio_banks/gpio.c | |
| parent | a1f254b91b6bc0be67870629fc9aaa765671c649 (diff) | |
soc/amd/common/block/gpio_banks: fix sequence in gpio_output
When configuring a GPIO pin as output the value should be written before
it gets configures as an output to avoid a possible glitch on the output
when the GPIO pin was an input before and the output value was different
from the one that got written afterwards.
Change-Id: I2bb5e629ef0ed2daadc903ecc1852200fe3a5cb9
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49119
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Diffstat (limited to 'src/soc/amd/common/block/gpio_banks/gpio.c')
| -rw-r--r-- | src/soc/amd/common/block/gpio_banks/gpio.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/soc/amd/common/block/gpio_banks/gpio.c b/src/soc/amd/common/block/gpio_banks/gpio.c index 03804d56f1..bdc243fa2c 100644 --- a/src/soc/amd/common/block/gpio_banks/gpio.c +++ b/src/soc/amd/common/block/gpio_banks/gpio.c @@ -162,8 +162,9 @@ void gpio_input(gpio_t gpio_num) void gpio_output(gpio_t gpio_num, int value) { - gpio_or32(gpio_num, GPIO_OUTPUT_ENABLE); + /* set GPIO output value before setting the direction to output to avoid glitches */ gpio_set(gpio_num, value); + gpio_or32(gpio_num, GPIO_OUTPUT_ENABLE); } const char *gpio_acpi_path(gpio_t gpio) |