Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755740Ab1BXBge (ORCPT ); Wed, 23 Feb 2011 20:36:34 -0500 Received: from mail-gy0-f174.google.com ([209.85.160.174]:55091 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754205Ab1BXBgc (ORCPT ); Wed, 23 Feb 2011 20:36:32 -0500 From: =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= To: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org, =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , Russell King , Alexander Shishkin , Jason Wessel , Greg Kroah-Hartman , linux-kernel@vger.kernel.org Subject: [PATCH 9/9 (originally 8)] ARM: etm: Power down etm(s) when tracing is not enabled Date: Wed, 23 Feb 2011 17:36:09 -0800 Message-Id: <1298511369-20257-1-git-send-email-arve@android.com> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1296701663-12168-1-git-send-email-arve@android.com> References: <1296701663-12168-1-git-send-email-arve@android.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1426 Lines: 39 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 --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/