linux-kernel - [PATCH] irqchip: gic-v3: Handle failure case of CPU enters low power state

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Date:   Fri, 23 Dec 2022 00:05:40 +0530
From:   Yogesh Lal <quic_ylal@...cinc.com>
To:     <tglx@...utronix.de>, <maz@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-arm-msm@...r.kernel.org>, Yogesh Lal <quic_ylal@...cinc.com>
Subject: [PATCH] irqchip: gic-v3: Handle failure case of CPU enters low power state

When CPU enter in low power mode it disable the redistributor and
Group1 interrupts. And re-initialise the system registers on wakeup.

But in case of failure to enter low power mode need to enable
the redistributor and Group1 interrupts.

Signed-off-by: Yogesh Lal <quic_ylal@...cinc.com>
---
 drivers/irqchip/irq-gic-v3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 997104d..4904f00 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1376,7 +1376,7 @@ 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_init();
-- 
2.7.4