[PATCH v2 3/3] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

[Nick Hu]

Stop the stimecmp when the cpu is going to be off otherwise the timer
stimecmp register while cpu non retention suspend.

Suggested-by: Anup Patel <anup at brainfault.org>
Link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u
Signed-off-by: Nick Hu <nick.hu at sifive.com>
---
 drivers/clocksource/timer-riscv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 48ce50c5f5e6..166dee14e46b 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -127,6 +127,12 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
 static int riscv_timer_dying_cpu(unsigned int cpu)
 {
 	disable_percpu_irq(riscv_clock_event_irq);
+	/*
+	 * Stop the timer when the cpu is going to be offline otherwise
+	 * the timer interrupt may be pending while performing power-down.
+	 */
+	riscv_clock_event_stop();
+
 	return 0;
 }
 
-- 
2.34.1