This is a note to let you know that I've just added the patch titled
clocksource/drivers/timer-riscv: Clear timer interrupt on timer initialization
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clocksource-drivers-timer-riscv-clear-timer-interrup.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 212ce198ef526ae5e52285b38adaf6d39a8973d1
Author: Ley Foon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
Date: Thu Mar 7 01:23:30 2024 +0800
clocksource/drivers/timer-riscv: Clear timer interrupt on timer initialization
[ Upstream commit 8248ca30ef89f9cc74ace62ae1b9a22b5f16736c ]
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.
Fixes: 9f7a8ff6391f ("RISC-V: Prefer sstc extension if available")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Ley Foon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
Reviewed-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Tested-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240306172330.255844-1-leyfoon.tan@xxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index e66dcbd665665..79bb9a98baa7b 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -108,6 +108,9 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
{
struct clock_event_device *ce = per_cpu_ptr(&riscv_clock_event, cpu);
+ /* Clear timer interrupt */
+ riscv_clock_event_stop();
+
ce->cpumask = cpumask_of(cpu);
ce->irq = riscv_clock_event_irq;
if (riscv_timer_cannot_wake_cpu)
