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perf: arm_v7_pmu: Don't disable counter in (armv7|krait_|scorpion_)pmu_enable_event()

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Currently (armv7|krait_|scorpion_)pmu_enable_event() start by disabling
the event counter it has been asked to enable. This should not be
necessary as the counter (and the PMU as a whole) should not be active
when *_enable_event() is called.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250218-arm-brbe-v19-v20-5-4e9922fc2e8e@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Rob Herring (Arm) 2025-02-18 14:40:00 -06:00 committed by Will Deacon
parent 7a53877482
commit 7bf1001e0d
1 changed files with 0 additions and 6 deletions
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6
drivers/perf/arm_v7_pmu.c
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@ -857,8 +857,6 @@ static void armv7pmu_enable_event(struct perf_event *event)
return;
}
armv7_pmnc_disable_counter(idx);
/*
* Set event (if destined for PMNx counters)
* We only need to set the event for the cycle counter if we
@ -1450,8 +1448,6 @@ static void krait_pmu_enable_event(struct perf_event *event)
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
armv7_pmnc_disable_counter(idx);
/*
* Set event (if destined for PMNx counters)
* We set the event for the cycle counter because we
@ -1762,8 +1758,6 @@ static void scorpion_pmu_enable_event(struct perf_event *event)
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
armv7_pmnc_disable_counter(idx);
/*
* Set event (if destined for PMNx counters)
* We don't set the event for the cycle counter because we