From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933159AbbLRO3V (ORCPT ); Fri, 18 Dec 2015 09:29:21 -0500 Received: from mail-wm0-f51.google.com ([74.125.82.51]:36607 "EHLO mail-wm0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932582AbbLROTa (ORCPT ); Fri, 18 Dec 2015 09:19:30 -0500 From: Daniel Lezcano To: tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mingo@kernel.org, Yoshinori Sato , uclinux-h8-devel@lists.sourceforge.jp (moderated list:H8/300 ARCHITECTURE) Subject: [PATCH 47/69] clocksource/drivers/h8300_timer8: Retrieve the clock rate at init time Date: Fri, 18 Dec 2015 15:18:00 +0100 Message-Id: <1450448302-27429-47-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1450448302-27429-1-git-send-email-daniel.lezcano@linaro.org> References: <5672CB9E.7090707@linaro.org> <1450448302-27429-1-git-send-email-daniel.lezcano@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current code retrieves the rate value when the timer is enabled which occurs each time a timer is re-armed. Except if the clock frequency has changed magically I don't see why this should be done each time. Retrieve the clock rate value at init time only. Signed-off-by: Daniel Lezcano --- drivers/clocksource/h8300_timer8.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c index 24d91b1..187c416 100644 --- a/drivers/clocksource/h8300_timer8.c +++ b/drivers/clocksource/h8300_timer8.c @@ -34,7 +34,6 @@ struct timer8_priv { unsigned long flags; unsigned int rate; unsigned int tcora; - struct clk *pclk; }; static unsigned long timer8_get_counter(struct timer8_priv *p) @@ -92,7 +91,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta) static int timer8_enable(struct timer8_priv *p) { - p->rate = clk_get_rate(p->pclk) / SCALE; ctrl_outw(0xffff, p->mapbase + TCORA); ctrl_outw(0x0000, p->mapbase + _8TCNT); ctrl_outw(0x0c02, p->mapbase + _8TCR); @@ -102,16 +100,15 @@ static int timer8_enable(struct timer8_priv *p) static int timer8_start(struct timer8_priv *p) { - int ret = 0; + int ret; - if (!(p->flags & FLAG_STARTED)) - ret = timer8_enable(p); + if ((p->flags & FLAG_STARTED)) + return 0; - if (ret) - goto out; - p->flags |= FLAG_STARTED; + ret = timer8_enable(p); + if (!ret) + p->flags |= FLAG_STARTED; - out: return ret; } @@ -217,7 +214,12 @@ static void __init h8300_8timer_init(struct device_node *node) } timer8_priv.mapbase = (unsigned long)base; - timer8_priv.pclk = clk; + + rate = clk_get_rate(clk) / SCALE; + if (!rate) { + pr_err("Failed to get rate for the clocksource\n"); + goto unmap_reg; + } ret = request_irq(irq, timer8_interrupt, IRQF_TIMER, timer8_priv.ced.name, &timer8_priv); @@ -225,10 +227,10 @@ static void __init h8300_8timer_init(struct device_node *node) pr_err("failed to request irq %d for clockevent\n", irq); goto unmap_reg; } - rate = clk_get_rate(clk) / SCALE; + clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff); - return; + return; unmap_reg: iounmap(base); free_clk: -- 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.lezcano@linaro.org (Daniel Lezcano) Date: Fri, 18 Dec 2015 15:18:00 +0100 Subject: [PATCH 47/69] clocksource/drivers/h8300_timer8: Retrieve the clock rate at init time In-Reply-To: <1450448302-27429-1-git-send-email-daniel.lezcano@linaro.org> References: <5672CB9E.7090707@linaro.org> <1450448302-27429-1-git-send-email-daniel.lezcano@linaro.org> Message-ID: <1450448302-27429-47-git-send-email-daniel.lezcano@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The current code retrieves the rate value when the timer is enabled which occurs each time a timer is re-armed. Except if the clock frequency has changed magically I don't see why this should be done each time. Retrieve the clock rate value at init time only. Signed-off-by: Daniel Lezcano --- drivers/clocksource/h8300_timer8.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c index 24d91b1..187c416 100644 --- a/drivers/clocksource/h8300_timer8.c +++ b/drivers/clocksource/h8300_timer8.c @@ -34,7 +34,6 @@ struct timer8_priv { unsigned long flags; unsigned int rate; unsigned int tcora; - struct clk *pclk; }; static unsigned long timer8_get_counter(struct timer8_priv *p) @@ -92,7 +91,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta) static int timer8_enable(struct timer8_priv *p) { - p->rate = clk_get_rate(p->pclk) / SCALE; ctrl_outw(0xffff, p->mapbase + TCORA); ctrl_outw(0x0000, p->mapbase + _8TCNT); ctrl_outw(0x0c02, p->mapbase + _8TCR); @@ -102,16 +100,15 @@ static int timer8_enable(struct timer8_priv *p) static int timer8_start(struct timer8_priv *p) { - int ret = 0; + int ret; - if (!(p->flags & FLAG_STARTED)) - ret = timer8_enable(p); + if ((p->flags & FLAG_STARTED)) + return 0; - if (ret) - goto out; - p->flags |= FLAG_STARTED; + ret = timer8_enable(p); + if (!ret) + p->flags |= FLAG_STARTED; - out: return ret; } @@ -217,7 +214,12 @@ static void __init h8300_8timer_init(struct device_node *node) } timer8_priv.mapbase = (unsigned long)base; - timer8_priv.pclk = clk; + + rate = clk_get_rate(clk) / SCALE; + if (!rate) { + pr_err("Failed to get rate for the clocksource\n"); + goto unmap_reg; + } ret = request_irq(irq, timer8_interrupt, IRQF_TIMER, timer8_priv.ced.name, &timer8_priv); @@ -225,10 +227,10 @@ static void __init h8300_8timer_init(struct device_node *node) pr_err("failed to request irq %d for clockevent\n", irq); goto unmap_reg; } - rate = clk_get_rate(clk) / SCALE; + clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff); - return; + return; unmap_reg: iounmap(base); free_clk: -- 1.9.1