intel_idle: Avoid using deep idle states during initialization

Browse source

Commit c0f6913889 ("intel_idle: Use subsys_initcall_sync() for
initialization") effectively made intel_idle initialize earlier which
turns out to interfere with USB EHCI probing on some platforms [1].
Investigation led to the conclusion that this was related to allowing
package idle states to be used earlier than before.

Work around that issue by making intel_idle set a CPU latency QoS
request to prevent package idle states from being used on all platforms
supported by it for the duration of the device_initcall() initialization
phase.

Fixes: c0f6913889 ("intel_idle: Use subsys_initcall_sync() for initialization")
Reported-by: Julian Silver <mendaxca@gmail.com>
Tested-by: Julian Silver <mendaxca@gmail.com>
Closes: https://lore.kernel.org/linux-acpi/3353bdf3-4f33-44b1-809b-b0378bee5816@gmail.com/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/5120454.31r3eYUQgx@rafael.j.wysocki

...

This commit is contained in:

Rafael J. Wysocki 2026-08-03 20:11:10 +02:00

parent 075b74841b

commit 9eadbed788

1 changed files with 23 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

23

drivers/idle/intel_idle.c

View file