From: Bartosz Golaszewski <brgl@bgdev.pl>
To: David Lechner <david@lechnology.com>
Cc: Kevin Hilman <khilman@kernel.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Sekhar Nori <nsekhar@ti.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/3] clocksource: davinci: work around a clocksource problem on dm365 SoC
Date: Tue, 17 Dec 2019 09:00:44 +0100 [thread overview]
Message-ID: <CAMRc=McRKwYkUcY9J8cEkwoMnGYxs7SkTnOnFsVMDZD2DkJ1Zw@mail.gmail.com> (raw)
In-Reply-To: <b9a28314-4fce-ebbd-be20-b0ffa2f1f15f@lechnology.com>
pon., 16 gru 2019 o 18:58 David Lechner <david@lechnology.com> napisał(a):
>
> >
> > +static unsigned int davinci_clocksource_tim32_mode;
>
> static unsigned bool davinci_clocksource_initialized;
>
> > +
> > static struct davinci_clockevent *
> > to_davinci_clockevent(struct clock_event_device *clockevent)
> > {
> > @@ -94,7 +96,7 @@ static void davinci_tim12_shutdown(void __iomem *base)
> > * halves. In this case TIM34 runs in periodic mode and we must
> > * not modify it.
> > */
> > - tcr |= DAVINCI_TIMER_ENAMODE_PERIODIC <<
> > + tcr |= davinci_clocksource_tim32_mode <<
> > DAVINCI_TIMER_ENAMODE_SHIFT_TIM34;
>
> if (davinci_clocksource_initialized)
> tcr |= DAVINCI_TIMER_ENAMODE_PERIODIC <<
> DAVINCI_TIMER_ENAMODE_SHIFT_TIM34;
I thought about doing this initially, but then figured this code would
be called a lot, so why not avoid branching and just store the right
value? Alternatively we can do:
if (likely(davinci_clocksource_initialized)
....
Bart
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next prev parent reply other threads:[~2019-12-17 8:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 16:24 [PATCH 0/3] ARM: davinci: convert dm365 to using the new clocksource driver Bartosz Golaszewski
2019-12-13 16:24 ` [PATCH 1/3] clocksource: davinci: work around a clocksource problem on dm365 SoC Bartosz Golaszewski
2019-12-16 17:58 ` David Lechner
2019-12-17 8:00 ` Bartosz Golaszewski [this message]
2019-12-17 17:01 ` David Lechner
2019-12-18 9:28 ` Sekhar Nori
2019-12-19 8:59 ` Bartosz Golaszewski
2019-12-13 16:24 ` [PATCH 2/3] ARM: davinci: dm365: switch to using the clocksource driver Bartosz Golaszewski
2019-12-13 16:24 ` [PATCH 3/3] ARM: davinci: remove legacy timer support Bartosz Golaszewski
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