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| author |   Marc Zyngier <maz@kernel.org> | 2021-10-17 13:42:12 +0100 |
|---|---|---|
| committer |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2021-10-17 21:47:05 +0200 |
| commit | a38b71b0833eb2fabd2b1fa37d665c0a88b8b7e4 (patch) | |
| tree | 37d1e56f4814a8c8eb749be6bfd000201cb22a25 /include/clocksource/arm_arch_timer.h | |
| parent | clocksource/drivers/arm_arch_timer: Extend write side of timer register accessors to u64 (diff) | |
| download | linux-dev-a38b71b0833eb2fabd2b1fa37d665c0a88b8b7e4.tar.xz linux-dev-a38b71b0833eb2fabd2b1fa37d665c0a88b8b7e4.zip | |
clocksource/drivers/arm_arch_timer: Move system register timer programming over to CVAL
In order to cope better with high frequency counters, move the
programming of the timers from the countdown timer (TVAL) over
to the comparator (CVAL).
The programming model is slightly different, as we now need to
read the current counter value to have an absolute deadline
instead of a relative one.
There is a small overhead to this change, which we will address
in the following patches.
Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211017124225.3018098-5-maz@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'include/clocksource/arm_arch_timer.h')
| -rw-r--r-- | include/clocksource/arm_arch_timer.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 73c7139c866f..d59537afb29d 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -25,6 +25,7 @@ enum arch_timer_reg { ARCH_TIMER_REG_CTRL, ARCH_TIMER_REG_TVAL, + ARCH_TIMER_REG_CVAL, }; enum arch_timer_ppi_nr { |