From: Thomas Gleixner <tglx@linutronix.de> To: Jonas Jensen <jonas.jensen@gmail.com> Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, arm@kernel.org, john.stultz@linaro.org, u.kleine-koenig@pengutronix.de, tomasz.figa@gmail.com, linus.walleij@linaro.org, thomas.petazzoni@free-electrons.com, arnd@arndb.de Subject: Re: [PATCH v5] ARM: clocksource: add support for MOXA ART SoCs Date: Thu, 4 Jul 2013 23:42:36 +0200 (CEST) [thread overview] Message-ID: <alpine.DEB.2.02.1307042211420.11637@ionos.tec.linutronix.de> (raw) In-Reply-To: <1372940383-5957-1-git-send-email-jonas.jensen@gmail.com> On Thu, 4 Jul 2013, Jonas Jensen wrote: > This patch adds an clocksource driver for the main timer(s) > found on MOXA ART SoCs. > > Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com> > --- > > Notes: > Applies to next-20130703 > > Changes since v4: > > 1. add general cache for TIMER_CR register What you implemented is not a register cache. A register cache is caching the current value and not some initial constant. > +static void moxart_clkevt_mode(enum clock_event_mode mode, > + struct clock_event_device *clk) > +{ > + switch (mode) { > + case CLOCK_EVT_MODE_RESUME: > + case CLOCK_EVT_MODE_ONESHOT: > + writel(timereg_cache & ~TIMEREG_CR_1_ENABLE, base + TIMER_CR); You just modify bits on the "cache" variable. though you are not caching it. As it seems to work it looks like this register simply can be written with constants. > + timereg_cache = readl(base + TIMER_CR) | TIMEREG_CR_2_ENABLE; Why are you reading that back? You know excactly which of the timers you are using and none of those should be enabled before you reach that code. If it one of them is enabled by the boot loader you better disable it in this init function. Now if you disable all of those timers and just use a known set, then you can do without a pseudo cache variable and just write constants into the control register, right ? Thanks, tglx
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From: tglx@linutronix.de (Thomas Gleixner) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5] ARM: clocksource: add support for MOXA ART SoCs Date: Thu, 4 Jul 2013 23:42:36 +0200 (CEST) [thread overview] Message-ID: <alpine.DEB.2.02.1307042211420.11637@ionos.tec.linutronix.de> (raw) In-Reply-To: <1372940383-5957-1-git-send-email-jonas.jensen@gmail.com> On Thu, 4 Jul 2013, Jonas Jensen wrote: > This patch adds an clocksource driver for the main timer(s) > found on MOXA ART SoCs. > > Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com> > --- > > Notes: > Applies to next-20130703 > > Changes since v4: > > 1. add general cache for TIMER_CR register What you implemented is not a register cache. A register cache is caching the current value and not some initial constant. > +static void moxart_clkevt_mode(enum clock_event_mode mode, > + struct clock_event_device *clk) > +{ > + switch (mode) { > + case CLOCK_EVT_MODE_RESUME: > + case CLOCK_EVT_MODE_ONESHOT: > + writel(timereg_cache & ~TIMEREG_CR_1_ENABLE, base + TIMER_CR); You just modify bits on the "cache" variable. though you are not caching it. As it seems to work it looks like this register simply can be written with constants. > + timereg_cache = readl(base + TIMER_CR) | TIMEREG_CR_2_ENABLE; Why are you reading that back? You know excactly which of the timers you are using and none of those should be enabled before you reach that code. If it one of them is enabled by the boot loader you better disable it in this init function. Now if you disable all of those timers and just use a known set, then you can do without a pseudo cache variable and just write constants into the control register, right ? Thanks, tglx
next prev parent reply other threads:[~2013-07-04 21:42 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-06-18 10:00 [PATCH] ARM: clocksource: add support for MOXA ART SoCs Jonas Jensen 2013-06-18 10:00 ` Jonas Jensen 2013-06-18 15:14 ` Thomas Petazzoni 2013-06-18 15:14 ` Thomas Petazzoni 2013-06-18 15:28 ` Arnd Bergmann 2013-06-18 15:28 ` Arnd Bergmann 2013-06-26 14:53 ` [PATCH v2] " Jonas Jensen 2013-06-26 14:53 ` Jonas Jensen 2013-06-26 14:59 ` Jonas Jensen 2013-06-26 14:59 ` Jonas Jensen 2013-06-26 16:10 ` Uwe Kleine-König 2013-06-26 16:10 ` Uwe Kleine-König 2013-06-26 19:15 ` Linus Walleij 2013-06-26 19:15 ` Linus Walleij 2013-06-27 11:23 ` [PATCH v3] " Jonas Jensen 2013-06-27 11:23 ` Jonas Jensen 2013-06-28 13:34 ` Thomas Gleixner 2013-06-28 13:34 ` Thomas Gleixner 2013-07-01 14:02 ` [PATCH v4] " Jonas Jensen 2013-07-01 14:02 ` Jonas Jensen 2013-07-01 17:55 ` Thomas Gleixner 2013-07-01 17:55 ` Thomas Gleixner 2013-07-02 20:19 ` Linus Walleij 2013-07-02 20:19 ` Linus Walleij 2013-07-04 12:19 ` [PATCH v5] " Jonas Jensen 2013-07-04 12:19 ` Jonas Jensen 2013-07-04 21:42 ` Thomas Gleixner [this message] 2013-07-04 21:42 ` Thomas Gleixner 2013-07-05 10:05 ` Jonas Jensen 2013-07-05 10:05 ` Jonas Jensen 2013-07-05 10:21 ` Thomas Gleixner 2013-07-05 10:21 ` Thomas Gleixner 2013-07-05 11:48 ` Jonas Jensen 2013-07-05 11:48 ` Jonas Jensen 2013-07-05 10:04 ` [PATCH v6] " Jonas Jensen 2013-07-05 10:04 ` Jonas Jensen 2013-07-05 11:46 ` [PATCH v7] " Jonas Jensen 2013-07-05 11:46 ` Jonas Jensen 2013-07-16 13:52 ` Daniel Lezcano 2013-07-16 13:52 ` Daniel Lezcano 2013-07-16 14:44 ` [PATCH v8] " Jonas Jensen 2013-07-16 14:44 ` Jonas Jensen 2013-07-16 15:01 ` Daniel Lezcano 2013-07-16 15:01 ` Daniel Lezcano 2013-07-17 8:14 ` Jonas Jensen 2013-07-17 8:14 ` Jonas Jensen 2013-07-17 12:13 ` Daniel Lezcano 2013-07-17 12:13 ` Daniel Lezcano 2013-07-17 8:04 ` [PATCH v9] " Jonas Jensen 2013-07-17 8:04 ` Jonas Jensen 2013-07-19 11:12 ` [PATCH] ARM: clocksource: moxart: documentation: update device tree bindings document Jonas Jensen 2013-07-19 11:12 ` Jonas Jensen 2013-07-19 12:16 ` Daniel Lezcano 2013-07-19 12:16 ` Daniel Lezcano 2013-07-19 12:50 ` Jonas Jensen 2013-07-19 12:50 ` Jonas Jensen 2013-07-20 20:45 ` [PATCH v9] ARM: clocksource: add support for MOXA ART SoCs Linus Walleij 2013-07-20 20:45 ` Linus Walleij 2013-07-20 21:34 ` Daniel Lezcano 2013-07-20 21:34 ` Daniel Lezcano 2013-07-26 14:03 ` [PATCH] ARM: clocksource: moxart: add bitops.h include Jonas Jensen 2013-07-26 14:03 ` Jonas Jensen
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