diff options
Diffstat (limited to 'src/acpi/device.c')
| -rw-r--r-- | src/acpi/device.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/acpi/device.c b/src/acpi/device.c index 1df179bad6..2b085b61a6 100644 --- a/src/acpi/device.c +++ b/src/acpi/device.c @@ -670,6 +670,19 @@ void acpi_device_add_power_res(const struct acpi_power_res_params *params) /* Method (_ON, 0, Serialized) */ acpigen_write_method_serialized("_ON", 0); + /* Call _STA and early return if the device is already enabled, since the Linux + kernel doesn't check the device status before calling _ON. This avoids + unnecessary delays while booting. */ + if (params->use_gpio_for_status) { + /* Local0 = _STA () */ + acpigen_write_store(); + acpigen_emit_namestring("_STA"); + acpigen_emit_byte(LOCAL0_OP); + /* If (( Local0 == ACPI_POWER_RESOURCE_STATUS_ON_OP)) */ + acpigen_write_if_lequal_op_op(LOCAL0_OP, ACPI_POWER_RESOURCE_STATUS_ON_OP); + acpigen_write_return_op(ZERO_OP); + acpigen_write_if_end(); + } if (reset_gpio) acpigen_enable_tx_gpio(params->reset_gpio); if (enable_gpio) { |