[PATCH v3] clocksource/drivers/arm_arch_timer: Fix handling of ARM erratum 858921

[Oliver Upton]

On Wed, Sep 14, 2022 at 02:14:24PM +0800, Kunkun Jiang wrote:
> The commit a38b71b0833e ("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: a38b71b0833e ("clocksource/drivers/arm_arch_timer: Move system register timer programming over to CVAL")
> Signed-off-by: Kunkun Jiang <jiangkunkun at huawei.com>
> Acked-by: Marc Zyngier <maz at kernel.org>

Reviewed-by: Oliver Upton <oliver.upton at linux.dev>

--
Thanks,
Oliver