From: Tony Lindgren <tony@atomide.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Russell King <linux@arm.linux.org.uk>,
John Stultz <john.stultz@linaro.org>,
linux-omap@vger.kernel.org
Subject: Re: [PATCH] ARM: OMAP2+: Get rid of custom OMAP_32K_TIMER_HZ
Date: Fri, 1 Feb 2013 14:52:02 -0800 [thread overview]
Message-ID: <20130201225202.GI22517@atomide.com> (raw)
In-Reply-To: <1524396.4DaQLsSWOZ@wuerfel>
* Arnd Bergmann <arnd@arndb.de> [130131 07:41]:
> On Thursday 31 January 2013 21:02:00 Santosh Shilimkar wrote:
> > The timekeeping doesn't depend on HZ value in presence of fine grained
> > clocksource and hence there should not be any time drift because of HZ
> > value which was chosen to be divisor of 32768.
> >
> > OMAP has been using HZ = 128 value to avoid any time drift issues
> > because of 32768 HZ clock. But with various measurements performed
> > with HZ = 100, no time drift is observed and it also proves the
> > point about HZ not having impact on time keeping on OMAP.
> >
> > Very informative thread on this topic is here:
> > https://lkml.org/lkml/2013/1/29/435
> >
> > Special thanks to John Stulz, Arnd Bergmann and Russell King for their
> > valuable suggestions.
> >
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Russell King <linux@arm.linux.org.uk>
> > Cc: John Stultz <john.stultz@linaro.org>
> > Cc: Tony Lindgren <tony@atomide.com>
>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
>
> Thanks so much for looking into this!
Great thanks for checking it Santosh! Applying into
omap-for-v3.9/soc.
Tony
WARNING: multiple messages have this Message-ID (diff)
From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: OMAP2+: Get rid of custom OMAP_32K_TIMER_HZ
Date: Fri, 1 Feb 2013 14:52:02 -0800 [thread overview]
Message-ID: <20130201225202.GI22517@atomide.com> (raw)
In-Reply-To: <1524396.4DaQLsSWOZ@wuerfel>
* Arnd Bergmann <arnd@arndb.de> [130131 07:41]:
> On Thursday 31 January 2013 21:02:00 Santosh Shilimkar wrote:
> > The timekeeping doesn't depend on HZ value in presence of fine grained
> > clocksource and hence there should not be any time drift because of HZ
> > value which was chosen to be divisor of 32768.
> >
> > OMAP has been using HZ = 128 value to avoid any time drift issues
> > because of 32768 HZ clock. But with various measurements performed
> > with HZ = 100, no time drift is observed and it also proves the
> > point about HZ not having impact on time keeping on OMAP.
> >
> > Very informative thread on this topic is here:
> > https://lkml.org/lkml/2013/1/29/435
> >
> > Special thanks to John Stulz, Arnd Bergmann and Russell King for their
> > valuable suggestions.
> >
> > Cc: Arnd Bergmann <arnd@arndb.de>
> > Cc: Russell King <linux@arm.linux.org.uk>
> > Cc: John Stultz <john.stultz@linaro.org>
> > Cc: Tony Lindgren <tony@atomide.com>
>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
>
> Thanks so much for looking into this!
Great thanks for checking it Santosh! Applying into
omap-for-v3.9/soc.
Tony
next prev parent reply other threads:[~2013-02-01 22:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-31 15:32 [PATCH] ARM: OMAP2+: Get rid of custom OMAP_32K_TIMER_HZ Santosh Shilimkar
2013-01-31 15:32 ` Santosh Shilimkar
2013-01-31 15:37 ` Arnd Bergmann
2013-01-31 15:37 ` Arnd Bergmann
2013-02-01 22:52 ` Tony Lindgren [this message]
2013-02-01 22:52 ` Tony Lindgren
2013-02-03 12:50 ` Igor Grinberg
2013-02-03 12:50 ` Igor Grinberg
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