linux-kernel - [PATCH 3/3] clocksource/drivers/timer-clint: Add set_state_oneshot

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Date: Wed, 27 Mar 2024 23:35:02 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] clocksource/drivers/timer-clint: Add set_state_oneshot_stopped

To avoid spurious timer interrupts when KTIME_MAX is used, we need to
configure set_state_oneshot_stopped(). Although implementing this is
optional, it still affects things like power management for the extra
timer interrupt.

Check commit 8fff52fd5093 ("clockevents: Introduce
CLOCK_EVT_STATE_ONESHOT_STOPPED state") for more information.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 drivers/clocksource/timer-clint.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clocksource/timer-clint.c b/drivers/clocksource/timer-clint.c
index 56cf6c672e6d..f5c04520d6b1 100644
--- a/drivers/clocksource/timer-clint.c
+++ b/drivers/clocksource/timer-clint.c
@@ -134,6 +134,7 @@ static DEFINE_PER_CPU(struct clock_event_device, clint_clock_event) = {
 	.rating				= 100,
 	.set_next_event			= clint_clock_next_event,
 	.set_state_shutdown		= clint_clock_shutdown,
+	.set_state_oneshot_stopped	= clint_clock_shutdown,
 };
 
 static int clint_timer_starting_cpu(unsigned int cpu)
-- 
2.43.0