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intel_idle: Rescan "dead" SMT siblings during initialization 

Make intel_idle_init() call arch_cpu_rescan_dead_smt_siblings() after
successfully registering intel_idle as the cpuidle driver so as to
allow the "dead" SMT siblings (if any) to go into deep idle states.

This is necessary for the processor to be able to reach deep package
C-states (like PC10) going forward which is requisite for reducing
power sufficiently in suspend-to-idle, among other things.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/10669885.nUPlyArG6x@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki 2025-06-05 17:06:08 +02:00
parent 4c529a4a72
commit a430c11f40
1 changed files with 2 additions and 0 deletions
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2
drivers/idle/intel_idle.c
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@ -2507,6 +2507,8 @@ static int __init intel_idle_init(void)
pr_debug("Local APIC timer is reliable in %s\n",
boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1");
arch_cpu_rescan_dead_smt_siblings();
return 0;
hp_setup_fail: