linux-kernel - [PATCH] clocksource: timer-riscv: Clear timer interrupt on timer initialization

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Date: Fri, 26 Jan 2024 00:54:16 +0800
From: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>
Cc: atishp@...osinc.com,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Ley Foon Tan <lftan.linux@...il.com>
Subject: [PATCH] clocksource: timer-riscv: Clear timer interrupt on timer initialization

In the RISC-V specification, the stimecmp register doesn't have a default
value. To prevent the timer interrupt from being triggered during timer
initialization, clear the timer interrupt by writing stimecmp with a
maximum value.

Signed-off-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
---
 drivers/clocksource/timer-riscv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index e66dcbd66566..a75a74647344 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -172,6 +172,9 @@ static int __init riscv_timer_init_common(void)
 
 	sched_clock_register(riscv_sched_clock, 64, riscv_timebase);
 
+	/* Clear timer interrupt */
+	riscv_clock_event_stop();
+
 	error = request_percpu_irq(riscv_clock_event_irq,
 				    riscv_timer_interrupt,
 				    "riscv-timer", &riscv_clock_event);
-- 
2.43.0