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| author | Jean PIHET <jpihet@mvista.com> | 2009-12-15 12:36:10 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-12-22 15:32:31 +0000 |
| commit | 3321c2bceab3ae6efdb2dc119c41d78e85d4b661 (patch) | |
| tree | 73f0472cfc082893c0d71e32a0a8b3109e6133a5 | |
| parent | cdd90fb575807622e69245d5c3048281f47c77b3 (diff) | |
| download | op-kernel-dev-3321c2bceab3ae6efdb2dc119c41d78e85d4b661.zip op-kernel-dev-3321c2bceab3ae6efdb2dc119c41d78e85d4b661.tar.gz | |
ARM: 5849/1: ARMv7: fix Oprofile events count
On Oprofile ARMv7 the PMNC_D bit was set to lower the PMU IRQs
and so to decrease the risk of errata #628216 from appearing.
The effect of setting the PMNC_D bit is that the CCNT counter
is divided by 64, making the program counter events count
inaccurate.
The new OMAP3 r4 cores should have that errata fixed.
The PMNC_D bit should not be set, this patch fixes it.
Signed-off-by: Jean Pihet <jpihet@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/oprofile/op_model_v7.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/arm/oprofile/op_model_v7.c b/arch/arm/oprofile/op_model_v7.c index f20295f..2088a6c 100644 --- a/arch/arm/oprofile/op_model_v7.c +++ b/arch/arm/oprofile/op_model_v7.c @@ -191,12 +191,8 @@ int armv7_setup_pmnc(void) return -EBUSY; } - /* - * Initialize & Reset PMNC: C bit, D bit and P bit. - * Note: Using a slower count for CCNT (D bit: divide by 64) results - * in a more stable system - */ - armv7_pmnc_write(PMNC_P | PMNC_C | PMNC_D); + /* Initialize & Reset PMNC: C bit and P bit */ + armv7_pmnc_write(PMNC_P | PMNC_C); for (cnt = CCNT; cnt < CNTMAX; cnt++) { |
