From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752497Ab3B1KBe (ORCPT ); Thu, 28 Feb 2013 05:01:34 -0500 Received: from mail-wg0-f42.google.com ([74.125.82.42]:35637 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751265Ab3B1KBd (ORCPT ); Thu, 28 Feb 2013 05:01:33 -0500 From: Fabio Baltieri To: John Stultz Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Linus Walleij , Thomas Gleixner , Rabin Vincent , Fabio Baltieri Subject: [PATCH RESEND 1/2] clocksource: dbx500-prcmu: use relaxed readl variant Date: Thu, 28 Feb 2013 11:01:06 +0100 Message-Id: <1362045667-23891-1-git-send-email-fabio.baltieri@linaro.org> X-Mailer: git-send-email 1.8.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rabin Vincent Modify clksrc_dbx500_prcmu_read to replace readl() with readl_relaxed(). This speeds up calls to the function by about 40%. Signed-off-by: Rabin Vincent Acked-by: Linus Walleij Signed-off-by: Fabio Baltieri --- drivers/clocksource/clksrc-dbx500-prcmu.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c index c26c369..159f54a 100644 --- a/drivers/clocksource/clksrc-dbx500-prcmu.c +++ b/drivers/clocksource/clksrc-dbx500-prcmu.c @@ -33,15 +33,14 @@ static void __iomem *clksrc_dbx500_timer_base; -static cycle_t clksrc_dbx500_prcmu_read(struct clocksource *cs) +static cycle_t notrace clksrc_dbx500_prcmu_read(struct clocksource *cs) { + void __iomem *base = clksrc_dbx500_timer_base; u32 count, count2; do { - count = readl(clksrc_dbx500_timer_base + - PRCMU_TIMER_DOWNCOUNT); - count2 = readl(clksrc_dbx500_timer_base + - PRCMU_TIMER_DOWNCOUNT); + count = readl_relaxed(base + PRCMU_TIMER_DOWNCOUNT); + count2 = readl_relaxed(base + PRCMU_TIMER_DOWNCOUNT); } while (count2 != count); /* Negate because the timer is a decrementing counter */ -- 1.7.12.1