ARM: perf: Only reset PMxEVCNTCR registers on reset

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The Krait specific PMxEVCNTCR register is unpredictable upon
reset. Currently we clear the register before we setup an event,
but we don't need to do that. Instead, we can iterate through all
the events and clear them once when we reset the PMU, saving a
write in the event setup path.

Cc: Neil Leeder <nleeder@codeaurora.org>
Cc: Ashwin Chaugule <ashwinc@codeaurora.org>
Cc: Sheetal Sahasrabudhe <sheetals@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Stephen Boyd 2015-02-28 00:11:34 +00:00 • committed by Will Deacon

parent 65bab45113

commit 934999185e

1 changed files with 9 additions and 2 deletions

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arch/arm/kernel/perf_event_v7.c

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