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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>
This commit is contained in:
Arve Hjønnevåg
2011-02-23 16:51:58 -08:00
committed by Colin Cross
parent 1c2178bb25
commit 5ff24f6c12
1 changed files with 2 additions and 2 deletions
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4
arch/arm/kernel/etm.c
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@@ -200,7 +200,7 @@ 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) {
@@ -736,7 +736,7 @@ static int 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);