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

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
This commit is contained in:
Markus Stockhausen 2025-08-04 04:03:27 -04:00 committed by Daniel Lezcano
parent ca90147e55
commit c445bffbf2
1 changed files with 3 additions and 3 deletions
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6
drivers/clocksource/timer-rtl-otto.c
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@ -141,7 +141,7 @@ 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);
@ -154,7 +154,7 @@ 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);
@ -167,7 +167,7 @@ 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);