diff options
| author | Yogesh Lal <quic_ylal@quicinc.com> | 2024-12-20 15:09:07 +0530 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-01-15 09:42:44 +0100 |
| commit | 0d62a49ab55c99e8deb4593b8d9f923de1ab5c18 (patch) | |
| tree | dba0c80f218a2122172c81665af4ccb7f7e47a63 | |
| parent | 5bc55a333a2f7316b58edc7573e8e893f7acb532 (diff) | |
irqchip/gic-v3: Handle CPU_PM_ENTER_FAILED correctly
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@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
| -rw-r--r-- | drivers/irqchip/irq-gic-v3.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 79d8cc80693c..76dce0aac246 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -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(); |