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ACPI / PM: Do not execute _PS0 for devices without _PSC during initialization

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commit 7cd8407d53 upstream.

Commit b378549 (ACPI / PM: Do not power manage devices in unknown
initial states) added code to force devices without _PSC, but having
_PS0 defined in the ACPI namespace, into ACPI power state D0 by
executing _PS0 for them.  That turned out to break Toshiba P870-303,
however, so revert that code.

References: https://bugzilla.kernel.org/show_bug.cgi?id=58201
Reported-and-tested-by: Jerome Cantenot <jerome.cantenot@gmail.com>
Tracked-down-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki 2013-06-05 14:01:19 +02:00 committed by Greg Kroah-Hartman
parent 8c25251dbf
commit 54921fa89f
1 changed files with 6 additions and 4 deletions
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10
drivers/acpi/device_pm.c
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@ -269,11 +269,13 @@ int acpi_bus_init_power(struct acpi_device *device)
if (result)
return result;
} else if (state == ACPI_STATE_UNKNOWN) {
/* No power resources and missing _PSC? Try to force D0. */
/*
* No power resources and missing _PSC? Cross fingers and make
* it D0 in hope that this is what the BIOS put the device into.
* [We tried to force D0 here by executing _PS0, but that broke
* Toshiba P870-303 in a nasty way.]
*/
state = ACPI_STATE_D0;
result = acpi_dev_pm_explicit_set(device, state);
if (result)
return result;
}
device->power.state = state;
return 0;