perf: apple_m1: Don't disable counter in m1_pmu_enable_event()

Currently m1_pmu_enable_event() starts 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
m1_pmu_enable_event() is called.

Cc: Marc Zyngier <[email protected]>
Signed-off-by: Rob Herring (Arm) <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Tested-by: James Clark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: robherring

drivers/perf/apple_m1_cpu_pmu.c

@@ -396,10 +396,6 @@ static void m1_pmu_enable_event(struct perf_event *event)
 	user = event->hw.config_base & M1_PMU_CFG_COUNT_USER;
 	kernel = event->hw.config_base & M1_PMU_CFG_COUNT_KERNEL;
 
-	m1_pmu_disable_counter_interrupt(event->hw.idx);
-	m1_pmu_disable_counter(event->hw.idx);
-	isb();
-
 	m1_pmu_configure_counter(event->hw.idx, evt, user, kernel);
 	m1_pmu_enable_counter(event->hw.idx);
 	m1_pmu_enable_counter_interrupt(event->hw.idx);