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authorJean PIHET <jpihet@mvista.com>2009-12-15 12:36:10 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-12-22 15:32:31 +0000
commit3321c2bceab3ae6efdb2dc119c41d78e85d4b661 (patch)
tree73f0472cfc082893c0d71e32a0a8b3109e6133a5 /arch/arm/oprofile/op_model_v7.c
parentcdd90fb575807622e69245d5c3048281f47c77b3 (diff)
downloadlinux-2.6.34-ux500-3321c2bceab3ae6efdb2dc119c41d78e85d4b661.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>
Diffstat (limited to 'arch/arm/oprofile/op_model_v7.c')
-rw-r--r--arch/arm/oprofile/op_model_v7.c8
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 f20295f14ad..2088a6c0cc0 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++) {