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| author | =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com> | 2011-10-09 02:25:06 +0100 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2011-10-09 02:25:06 +0100 |
| commit | c24759d3088059f580f51f414ce34006b6265165 (patch) | |
| tree | ad1e3aa705586f86c219845bb5829635ece7a2da /arch/arm/kernel | |
| parent | e41d71836f5415fb3a6019e08a7c6d60c318538d (diff) | |
ARM: etm: Power down etm(s) when tracing is not enabled
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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.
Change-Id: I21bb5ecf1b7d29ce3790ceeb5323409cc22d5a3b
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | 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 82e6d38fb93..496b8b84e45 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 __devinit etm_probe(struct amba_device *dev, const 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); |