linux-kernel - Re: [PATCH v2 4/9] arm: twr-k70f120m: timer driver for Kinetis SoC

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Date:	Wed, 1 Jul 2015 16:20:48 +0200 (CEST)
From:	Paul Osmialowski <pawelo@...g.net.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Paul Osmialowski <pawelo@...g.net.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jiri Slaby <jslaby@...e.cz>, Kumar Gala <galak@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
	dmaengine@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Paul Bolle <pebolle@...cali.nl>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Anson Huang <b20788@...escale.com>,
	Frank Li <Frank.Li@...escale.com>,
	Jingchang Lu <jingchang.lu@...escale.com>,
	Rob Herring <r.herring@...escale.com>,
	Yuri Tikhonov <yur@...raft.com>,
	Sergei Poselenov <sposelenov@...raft.com>,
	Alexander Potashev <aspotashev@...raft.com>
Subject: Re: [PATCH v2 4/9] arm: twr-k70f120m: timer driver for Kinetis SoC



On Wed, 1 Jul 2015, Thomas Gleixner wrote:

>>
>> As I removed this kinetis_pit_enable() line, the timer did not start,
>> therefore the system became unusable. What could be possible reason for that?
>
> Well, you need to move both, the init and the enable into
> set_periodic().
>

Indeed, something like this worked:

diff --git a/drivers/clocksource/timer-kinetis.c 
b/drivers/clocksource/timer-kinetis.c
index 1424308..41ef94f 100644
--- a/drivers/clocksource/timer-kinetis.c
+++ b/drivers/clocksource/timer-kinetis.c
@@ -61,6 +61,7 @@ struct kinetis_clock_event_ddata {
         struct clock_event_device evtdev;
         void __iomem *base;
         void __iomem *mcr;
+       unsigned long rate;
         spinlock_t lock;
  };

@@ -115,6 +116,7 @@ static int kinetis_clockevent_tmr_set_state_periodic(
         struct kinetis_clock_event_ddata *pit =
                 container_of(evt, struct kinetis_clock_event_ddata, 
evtdev);

+       kinetis_pit_init(pit, (pit->rate / HZ) - 1);
         kinetis_pit_enable(pit, 1);

         return 0;
@@ -235,6 +237,7 @@ static void __init kinetis_clockevent_init(struct 
device_node *np)
                                 kinetis_clockevent_tmr_set_state_oneshot;
                 kinetis_tmr->base = base;
                 kinetis_tmr->mcr = mcr;
+               kinetis_tmr->rate = rate;
                 spin_lock_init(&kinetis_tmr->lock);

                 /*
@@ -250,9 +253,6 @@ static void __init kinetis_clockevent_init(struct 
device_node *np)

                 clockevents_register_device(&kinetis_tmr->evtdev);

-               kinetis_pit_init(kinetis_tmr, (rate / HZ) - 1);
-               kinetis_pit_enable(kinetis_tmr, 1);
-
                 if (request_irq(irq, kinetis_clockevent_tmr_irq_handler,
                                         IRQF_TIMER | IRQF_IRQPOLL,
                                         "kinetis-timer",

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