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irqchip/gic-v3: Handle CPU_PM_ENTER_FAILED correctly

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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: 3708d52fc6 ("irqchip: gic-v3: Implement CPU PM notifier")
Signed-off-by: Yogesh Lal <quic_ylal@quicinc.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20241220093907.2747601-1-quic_ylal@quicinc.com
This commit is contained in:
Yogesh Lal 2024-12-20 15:09:07 +05:30 committed by Thomas Gleixner
parent 5bc55a333a
commit 0d62a49ab5
1 changed files with 1 additions and 1 deletions
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2
drivers/irqchip/irq-gic-v3.c
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@ -1522,7 +1522,7 @@ static int gic_retrigger(struct irq_data *data)
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_enable();