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clocksource/drivers/timer-rtl-otto: Do not interfere with interrupts

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[ Upstream commit c445bffbf2 ]

During normal operation the timers are reprogrammed including an
interrupt acknowledgement. This has no effect as the whole timer
is setup from scratch afterwards. Especially in an interrupt this
has already been done by rttm_timer_interrupt().

Change the behaviour as follows:

- Use rttm_disable_timer() during reprogramming
- Keep rttm_stop_timer() for all other use cases.

Downstream has already tested and confirmed a patch. See
https://github.com/openwrt/openwrt/pull/19468
https://forum.openwrt.org/t/support-for-rtl838x-based-managed-switches/57875/3788

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Stephen Howell <howels@allthatwemight.be>
Tested-by: Bjørn Mork <bjorn@mork.no>
Link: https://lore.kernel.org/r/20250804080328.2609287-4-markus.stockhausen@gmx.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Markus Stockhausen
2025-08-04 04:03:27 -04:00
committed by Greg Kroah-Hartman
parent a105ec25d6
commit 612495b32c
1 changed files with 3 additions and 3 deletions
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6
drivers/clocksource/timer-rtl-otto.c
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@@ -147,7 +147,7 @@ static int rttm_next_event(unsigned long delta, struct clock_event_device *clkev
RTTM_DEBUG(to->of_base.base);
rttm_bounce_timer(to->of_base.base, RTTM_CTRL_COUNTER);
rttm_stop_timer(to->of_base.base);
rttm_disable_timer(to->of_base.base);
rttm_set_period(to->of_base.base, delta);
rttm_start_timer(to, RTTM_CTRL_COUNTER);
@@ -160,7 +160,7 @@ static int rttm_state_oneshot(struct clock_event_device *clkevt)
RTTM_DEBUG(to->of_base.base);
rttm_bounce_timer(to->of_base.base, RTTM_CTRL_COUNTER);
rttm_stop_timer(to->of_base.base);
rttm_disable_timer(to->of_base.base);
rttm_set_period(to->of_base.base, RTTM_TICKS_PER_SEC / HZ);
rttm_start_timer(to, RTTM_CTRL_COUNTER);
@@ -173,7 +173,7 @@ static int rttm_state_periodic(struct clock_event_device *clkevt)
RTTM_DEBUG(to->of_base.base);
rttm_bounce_timer(to->of_base.base, RTTM_CTRL_TIMER);
rttm_stop_timer(to->of_base.base);
rttm_disable_timer(to->of_base.base);
rttm_set_period(to->of_base.base, RTTM_TICKS_PER_SEC / HZ);
rttm_start_timer(to, RTTM_CTRL_TIMER);