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clocksource/drivers/arm_arch_timer: Fix handling of ARM erratum 858921

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[ Upstream commit 6c3b62d93e ]

The commit a38b71b083 ("clocksource/drivers/arm_arch_timer:
Move system register timer programming over to CVAL") moves the
programming of the timers from the countdown timer (TVAL) over
to the comparator (CVAL). This makes it necessary to read the
counter when programming next event. However, the workaround of
Cortex-A73 erratum 858921 does not set the corresponding
set_next_event_phys and set_next_event_virt.

Add the appropriate hooks to apply the erratum mitigation when
programming the next timer event.

Fixes: a38b71b083 ("clocksource/drivers/arm_arch_timer: Move system register timer programming over to CVAL")
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20220914061424.1260-1-jiangkunkun@huawei.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kunkun Jiang 2022-09-14 14:14:24 +08:00 committed by Greg Kroah-Hartman
parent c4c9d9edf4
commit f31ff2426c
1 changed files with 2 additions and 0 deletions
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2
drivers/clocksource/arm_arch_timer.c
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@ -473,6 +473,8 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.desc = "ARM erratum 858921",
.read_cntpct_el0 = arm64_858921_read_cntpct_el0,
.read_cntvct_el0 = arm64_858921_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_phys,
.set_next_event_virt = erratum_set_next_event_virt,
},
#endif
#ifdef CONFIG_SUN50I_ERRATUM_UNKNOWN1