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Date: Wed, 20 Jun 2012 18:47:41 -0400 From: John Stultz <john.stultz@...aro.org> To: LKML <linux-kernel@...r.kernel.org> Cc: Arve Hjønnevåg <arve@...roid.com>, Russell King <linux@....linux.org.uk>, Paul Gortmaker <paul.gortmaker@...driver.com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, John Stultz <john.stultz@...aro.org> Subject: [PATCH 09/15] ARM: etm: Power down etm(s) when tracing is not enabled From: Arve Hjønnevåg <arve@...roid.com> 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. CC: Russell King <linux@....linux.org.uk> CC: Paul Gortmaker <paul.gortmaker@...driver.com> CC: Alexander Shishkin <alexander.shishkin@...ux.intel.com> Acked-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com> Signed-off-by: Arve Hjønnevåg <arve@...roid.com> Signed-off-by: John Stultz <john.stultz@...aro.org> --- arch/arm/kernel/etm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index e3309ea..66bf592 100644 --- a/arch/arm/kernel/etm.c +++ b/arch/arm/kernel/etm.c @@ -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) { @@ -739,7 +739,7 @@ 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); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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