diff mbox series

[v1,3/5] intel_idle: Rescan "dead" SMT siblings during initialization

Message ID 10669885.nUPlyArG6x@rjwysocki.net
State New
Headers show
Series [v1,1/5] intel_idle: Use subsys_initcall_sync() for initialization | expand

Commit Message

Rafael J. Wysocki June 5, 2025, 3:06 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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>
---
 drivers/idle/intel_idle.c |    2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -2506,6 +2506,8 @@ 
 	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: