Commit 7cd8407 (ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization) introduced a regression on some systems with Intel Lynxpoint Low-Power Subsystem (LPSS) where some devices need to be powered up during initialization, but their device objects in the ACPI namespace have _PS0 and _PS3 only (without _PSC or power resources). To work around this problem, make the ACPI LPSS driver power up devices it knows about by using a new helper function acpi_device_fix_up_power() that does all of the necessary sanity checks and calls acpi_dev_pm_explicit_set() to put the device into D0.
Showing the changes to include (1 of 3 files). Show all
Unified · Split
| @@ -382,6 +382,7 @@ const char *acpi_power_state_string(int state); · 381 unmodified lines | |||
| 382 | int acpi_device_get_power(struct acpi_device *device, int *state); | 382 | int acpi_device_get_power(struct acpi_device *device, int *state); |
| 383 | int acpi_device_set_power(struct acpi_device *device, int state); | 383 | int acpi_device_set_power(struct acpi_device *device, int state); |
| 384 | int acpi_bus_init_power(struct acpi_device *device); | 384 | int acpi_bus_init_power(struct acpi_device *device); |
| 385 | int acpi_device_fix_up_power(struct acpi_device *device); | ||
| 385 | int acpi_bus_update_power(acpi_handle handle, int *state_p); | 386 | int acpi_bus_update_power(acpi_handle handle, int *state_p); |
| 386 | bool acpi_bus_power_manageable(acpi_handle handle); | 387 | bool acpi_bus_power_manageable(acpi_handle handle); |
| 387 | 388 | ||