rtc: brcmstb-waketimer: compensate for lack of wktmr disable

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Since the WKTMR hardware block cannot be disabled it is necessary
for the driver to accommodate for associated timing hazards. This
commit targets the following possibilities:

A possible race between clearing a wktmr event and the alarm expiring
is made one-sided by setting the alarm to its maximum value before
clearing the event.

Programming alarm values close to the current time may not trigger
events if the counter advances while the alarm is being programmed.
After programming an alarm, a check is made to ensure that it is
either in the future or an expiration event is pending.

Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230120190147.718976-4-opendmb@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Doug Berger 2023-01-20 11:01:44 -08:00 • committed by Alexandre Belloni

parent 2cd98b22c1

commit 516ae02c38

1 changed files with 34 additions and 18 deletions

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drivers/rtc/rtc-brcmstb-waketimer.c

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