diff options
| author | Matt DeVillier <matt.devillier@amd.corp-partner.google.com> | 2023-01-11 18:02:31 -0600 |
|---|---|---|
| committer | Martin L Roth <gaumless@gmail.com> | 2023-01-15 02:02:18 +0000 |
| commit | cf440b6530fa92474c34a994c6563ccc834e12a1 (patch) | |
| tree | c7cd51593529b4de051668105c8f638547a912eb /src/drivers/uart | |
| parent | ce7b252c4f6c2d44c98a033b13caa48c6cbd2b33 (diff) | |
drivers/uart/acpi: Drop 'disable_gpio_export_in_crs' flag
Exposing the GPIOs via an ACPI PowerResource and the _CRS results in the
OS driver and ACPI thinking they own the GPIO. This can cause timing
problems because it's not clear which system should be controlling the
GPIO.
There's no reason to require explicit disablement however, so drop the
superfluous 'disable' flag, and change the _CRS generation to check if
the GPIOs will be exported via the 'has_power_resource' flag instead.
This mirrors the change made for drivers/i2c/generic.
TEST=untested, as no boards selected this option.
Change-Id: Icb60502a4a7c5e7a1fcf1ee60e23c77e00d6de7b
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71851
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/drivers/uart')
| -rw-r--r-- | src/drivers/uart/acpi/acpi.c | 4 | ||||
| -rw-r--r-- | src/drivers/uart/acpi/chip.h | 3 |
2 files changed, 2 insertions, 5 deletions
diff --git a/src/drivers/uart/acpi/acpi.c b/src/drivers/uart/acpi/acpi.c index 3081182042..c43dc52f2d 100644 --- a/src/drivers/uart/acpi/acpi.c +++ b/src/drivers/uart/acpi/acpi.c @@ -11,10 +11,10 @@ static bool uart_acpi_add_gpios_to_crs(struct drivers_uart_acpi_config *config) { /* * Return false if: - * 1. Request to explicitly disable export of GPIOs in CRS, or + * 1. GPIOs are exported via a power resource, or * 2. Both reset and enable GPIOs are not provided. */ - if (config->disable_gpio_export_in_crs || + if (config->has_power_resource || ((config->reset_gpio.pin_count == 0) && (config->enable_gpio.pin_count == 0))) return false; diff --git a/src/drivers/uart/acpi/chip.h b/src/drivers/uart/acpi/chip.h index 03111650eb..6c7d2679f4 100644 --- a/src/drivers/uart/acpi/chip.h +++ b/src/drivers/uart/acpi/chip.h @@ -17,9 +17,6 @@ struct drivers_uart_acpi_config { struct acpi_gpio irq_gpio; /* GPIO to be used instead of PIRQ */ struct acpi_uart uart; /* UART device information */ - /* Disable reset and enable GPIO export in _CRS */ - bool disable_gpio_export_in_crs; - /* Does the device have a power resource? */ bool has_power_resource; |