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Subject[PATCH 9/9 (originally 8)] ARM: etm: Power down etm(s) when tracing is not enabled
Date
Without this change a saw an 18% increase in idle power consumption
on one deivce when trace support is compiled into the kernel. Now
I see the same increase only when tracing.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
---
arch/arm/kernel/etm.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 48de5a4..f2bc95e 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -199,7 +199,7 @@ static int trace_stop_etm(struct tracectx *t, int id)

etm_unlock(t, id);

- etm_writel(t, id, 0x440, ETMR_CTRL);
+ etm_writel(t, id, 0x441, ETMR_CTRL);
while (!(etm_readl(t, id, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout)
;
if (!timeout) {
@@ -738,7 +738,7 @@ static int __init etm_probe(struct amba_device *dev, struct amba_id *id)
(void)etm_readl(&tracer, t->etm_regs_count, ETMMR_OSSRR);

t->ncmppairs = etm_readl(t, t->etm_regs_count, ETMR_CONFCODE) & 0xf;
- etm_writel(t, t->etm_regs_count, 0x440, ETMR_CTRL);
+ etm_writel(t, t->etm_regs_count, 0x441, ETMR_CTRL);
etm_writel(t, t->etm_regs_count, new_count, ETMR_TRACEIDR);
etm_lock(t, t->etm_regs_count);

--
1.7.3.1
--
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