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[POWERPC] perfmon2: make pm_interval register read/write 

The pm_interval register in the Cell PMU is read/write, but was implemented in
the kernel as write-only. Previously, the written value was saved in a "shadow"
copy so calls to cbe_read_pm() could return the value.

Perfmon2 needs to be able to read the current values of pm_interval, so change
cbe_read_pm() to read the actual register instead of the "shadow" copy. There
is currently no code in the kernel that tries to read the pm_interval register
with cbe_read_pm() (expecting to receive the "shadow" value), so this should
not break any existing code.

Signed-off-by: Kevin Corry <kevcorry@us.ibm.com>
Signed-off-by: Carl Love <carll@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Kevin Corry 2007-12-11 13:49:17 +01:00 committed by Arnd Bergmann
parent 7ee17466b6
commit 29641ce165
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/cell/pmu.c
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@ -213,7 +213,7 @@ u32 cbe_read_pm(u32 cpu, enum pm_reg_name reg)
break;
case pm_interval:
READ_SHADOW_REG(val, pm_interval);
READ_MMIO_UPPER32(val, pm_interval);
break;
case pm_start_stop: