From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
Vitaly Kuzmichev <vkuzmichev@mvista.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>,
Wim Van Sebroeck <wim@iguana.be>,
"arm@kernel.org" <arm@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>, John Stultz <johnstul@us.ibm.com>,
Nicolas Pitre <nico@fluxnic.net>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH V2 0/6] arm_smp_twd: mpcore_wdt: Fix MPCORE watchdog setup
Date: Wed, 6 Jul 2011 12:16:03 +0100 [thread overview]
Message-ID: <20110706111603.GS8286@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110706110548.GA31936@1n450.cable.virginmedia.net>
On Wed, Jul 06, 2011 at 12:05:48PM +0100, Catalin Marinas wrote:
> On Wed, Jul 06, 2011 at 11:14:56AM +0100, Russell King - ARM Linux wrote:
> > Do we know why the calibration was initially introduced? FWIR, it came
> > from the SMP group in ARM, so I guess they had a reason for it rather
> > than copying x86.
>
> I think it was introduced because the TWD frequency is half of the CPU
> frequency but the latter may not be known - boot monitor configuration
> could change it.
Okay, that implies we can't have a fixed frequency built into the kernel
then. For such platforms like the ARM dev boards (realview + vexpress),
I expect we can read the CPU frequency from somewhere like one of the
ICST PLLs.
next prev parent reply other threads:[~2011-07-06 11:16 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-04 9:45 [PATCH 0/4] ARM: smp_twd: " vkuzmichev
2010-10-04 9:45 ` [PATCH 1/4] ARM: smp_twd: mpcore_wdt: Fix watchdog counter loading vkuzmichev
2010-10-04 9:45 ` [PATCH 2/4] ARM: smp_twd: Fix typo in twd_timer_rate printout vkuzmichev
2010-10-04 9:45 ` [PATCH 3/4] ARM: mpcore_wdt: Fix WDIOC_SETOPTIONS handling vkuzmichev
2010-10-04 9:45 ` [PATCH 4/4] ARM: mpcore_wdt: Fix timer mode setup vkuzmichev
2011-05-27 8:26 ` [PATCH 0/4] ARM: smp_twd: mpcore_wdt: Fix MPCORE watchdog setup Wim Van Sebroeck
2011-05-27 10:44 ` Marc Zyngier
2011-07-05 19:00 ` [PATCH V2 0/6] arm_smp_twd: " Vitaly Kuzmichev
2011-07-06 10:05 ` Marc Zyngier
2011-07-06 10:14 ` Russell King - ARM Linux
2011-07-06 11:05 ` Catalin Marinas
2011-07-06 11:16 ` Russell King - ARM Linux [this message]
2011-07-10 10:39 ` Russell King - ARM Linux
2011-07-11 9:43 ` Catalin Marinas
2011-07-11 9:54 ` Russell King - ARM Linux
2011-07-11 11:06 ` Catalin Marinas
2011-07-06 12:27 ` Vitaly Kuzmichev
2011-07-06 12:39 ` Marc Zyngier
2011-07-06 15:06 ` Vitaly Kuzmichev
2011-07-05 19:00 ` [PATCH V2 1/6] arm_smp_twd: Fix typo in 'twd_timer_rate' printing Vitaly Kuzmichev
2011-07-05 19:00 ` [PATCH V2 2/6] arm_smp_twd: mpcore_wdt: Fix watchdog counter loading Vitaly Kuzmichev
2011-07-06 12:05 ` Arnd Bergmann
2011-07-05 19:00 ` [PATCH V2 3/6] mpcore_wdt: Fix WDIOC_SETOPTIONS handling Vitaly Kuzmichev
2011-07-06 12:05 ` Sergei Shtylyov
2011-07-06 12:22 ` Arnd Bergmann
2011-07-06 13:13 ` Vitaly Kuzmichev
2011-07-06 13:48 ` Russell King - ARM Linux
2011-07-06 13:52 ` Russell King - ARM Linux
2011-07-06 14:19 ` Arnd Bergmann
2011-07-06 15:27 ` Arnd Bergmann
2011-07-06 17:28 ` Wim Van Sebroeck
2011-07-05 19:00 ` [PATCH V2 4/6] mpcore_wdt: Fix timer mode setup Vitaly Kuzmichev
2011-07-05 19:00 ` [PATCH V2 5/6] mpcore_wdt: Add cpufreq notifier to reload counter Vitaly Kuzmichev
2011-07-06 12:09 ` Sergei Shtylyov
2011-07-05 19:00 ` [PATCH V2 6/6] mpcore_wdt: Move declarations in a separate header Vitaly Kuzmichev
2011-07-06 11:58 ` Arnd Bergmann
2011-07-06 12:36 ` Vitaly Kuzmichev
2011-07-06 12:48 ` Arnd Bergmann
2011-07-10 10:42 ` Russell King - ARM Linux
2011-07-06 12:11 ` Sergei Shtylyov
2011-07-07 12:22 ` [PATCH V3 0/4] ARM: smp_twd: mpcore_wdt: Fix MPCORE watchdog setup Vitaly Kuzmichev
2011-07-07 12:23 ` [PATCH V3 1/4] ARM: smp_twd: Fix typo in 'twd_timer_rate' printing Vitaly Kuzmichev
2011-07-07 12:39 ` Russell King - ARM Linux
2011-07-07 12:50 ` Vitaly Kuzmichev
2011-07-07 13:31 ` Vitaly Kuzmichev
2011-07-07 16:20 ` Vitaly Kuzmichev
2011-07-10 10:47 ` Russell King - ARM Linux
2011-07-11 11:50 ` Vitaly Kuzmichev
2011-07-07 12:23 ` [PATCH V3 2/4] ARM: smp_twd: mpcore_wdt: Fix watchdog counter loading Vitaly Kuzmichev
2011-07-07 12:44 ` Arnd Bergmann
2011-07-07 14:09 ` Vitaly Kuzmichev
2011-07-07 12:23 ` [PATCH V3 3/4] ARM: mpcore_wdt: Fix WDIOC_SETOPTIONS handling Vitaly Kuzmichev
2011-07-07 12:45 ` Arnd Bergmann
2011-07-07 12:23 ` [PATCH V3 4/4] ARM: mpcore_wdt: Fix timer mode setup Vitaly Kuzmichev
2011-07-07 12:46 ` [PATCH V3 0/4] ARM: smp_twd: mpcore_wdt: Fix MPCORE watchdog setup Wim Van Sebroeck
2011-07-07 14:06 ` [PATCH V4 2/4] ARM: smp_twd: mpcore_wdt: Fix watchdog counter loading Vitaly Kuzmichev
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