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

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Message-Id: <20240926065422.226518-4-nick.hu@sifive.com>
Date: Thu, 26 Sep 2024 14:54:18 +0800
From: Nick Hu <nick.hu@...ive.com>
To: greentime.hu@...ive.com,
	zong.li@...ive.com,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anup Patel <anup@...infault.org>,
	Andrew Jones <ajones@...tanamicro.com>,
	Mayuresh Chitale <mchitale@...tanamicro.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Atish Patra <atishp@...osinc.com>,
	Nick Hu <nick.hu@...ive.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Samuel Ortiz <sameo@...osinc.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH v2 3/3] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

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@...infault.org>
Link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u
Signed-off-by: Nick Hu <nick.hu@...ive.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