diff options
| author | Rafael J. Wysocki <[email protected]> | 2021-05-21 15:13:11 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <[email protected]> | 2021-05-24 16:08:17 +0200 |
| commit | 9b7ff25d129df7c4f61e08382993e1988d56f6a7 (patch) | |
| tree | 975215d0b87f8e97b9ba6b245ba95ee9fac9ed65 /drivers/usb/cdns3/cdns3-debug.h | |
| parent | c4681547bcce777daf576925a966ffa824edd09d (diff) | |
ACPI: power: Refine turning off unused power resources
Commit 7e4fdeafa61f ("ACPI: power: Turn off unused power resources
unconditionally") dropped the power resource state check from
acpi_turn_off_unused_power_resources(), because according to the
ACPI specification (e.g. ACPI 6.4, Section 7.2.2) the OS "may run
the _OFF method repeatedly, even if the resource is already off".
However, it turns out that some systems do not follow the
specification in this particular respect and that commit introduced
boot issues on them, so refine acpi_turn_off_unused_power_resources()
to only turn off power resources without any users after device
enumeration and restore its previous behavior in the system-wide
resume path.
Fixes: 7e4fdeafa61f ("ACPI: power: Turn off unused power resources unconditionally")
Link: https://uefi.org/specs/ACPI/6.4/07_Power_and_Performance_Mgmt/declaring-a-power-resource-object.html#off
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213019
Reported-by: Zhang Rui <[email protected]>
Tested-by: Zhang Rui <[email protected]>
Reported-by: Dave Olsthoorn <[email protected]>
Tested-by: Dave Olsthoorn <[email protected]>
Reported-by: Shujun Wang <[email protected]>
Tested-by: Shujun Wang <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'drivers/usb/cdns3/cdns3-debug.h')
0 files changed, 0 insertions, 0 deletions