From: Yogesh Lal <quic_ylal@xxxxxxxxxxx>
commit 0d62a49ab55c99e8deb4593b8d9f923de1ab5c18 upstream.
When a CPU attempts to enter low power mode, it disables the redistributor
and Group 1 interrupts and reinitializes the system registers upon wakeup.
If the transition into low power mode fails, then the CPU_PM framework
invokes the PM notifier callback with CPU_PM_ENTER_FAILED to allow the
drivers to undo the state changes.
The GIC V3 driver ignores CPU_PM_ENTER_FAILED, which leaves the GIC in
disabled state.
Handle CPU_PM_ENTER_FAILED in the same way as CPU_PM_EXIT to restore normal
operation.
[ tglx: Massage change log, add Fixes tag ]
Fixes: 3708d52fc6bb ("irqchip: gic-v3: Implement CPU PM notifier")
Signed-off-by: Yogesh Lal <quic_ylal@xxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/all/20241220093907.2747601-1-quic_ylal@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-gic-v3.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1185,7 +1185,7 @@ static int gic_set_affinity(struct irq_d
static int gic_cpu_pm_notifier(struct notifier_block *self,
unsigned long cmd, void *v)
{
- if (cmd == CPU_PM_EXIT) {
+ if (cmd == CPU_PM_EXIT || cmd == CPU_PM_ENTER_FAILED) {
if (gic_dist_security_disabled())
gic_enable_redist(true);
gic_cpu_sys_reg_init();
Patches currently in stable-queue which might be from quic_ylal@xxxxxxxxxxx are
queue-5.4/irqchip-gic-v3-handle-cpu_pm_enter_failed-correctly.patch
