From: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>
To: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
t-kristo-l0cyMroinI0@public.gmane.org,
Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>
Cc: nsekhar-l0cyMroinI0@public.gmane.org,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [4.4-rc][PATCH v2] ARM: dts: am4372: fix clock source for arm twd and global timers
Date: Tue, 8 Dec 2015 19:41:39 +0200 [thread overview]
Message-ID: <56671653.4030002@ti.com> (raw)
In-Reply-To: <5660843E.3000801-l0cyMroinI0@public.gmane.org>
Hi Tony, Felipe, Tero,
On 12/03/2015 08:04 PM, Grygorii Strashko wrote:
> On 12/03/2015 06:35 PM, Tony Lindgren wrote:
>> * Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org> [151130 07:58]:
>>> ARM TWD and Global timer are clocked by PERIPHCLK which is MPU_CLK/2.
>>> But now they are clocked by dpll_mpu_m2_ck == MPU_CLK and, as result.
>>> Timekeeping core misbehaves. For example, execution of command
>>> "sleep 5" will take 10 sec instead of 5.
>>>
>>> Hence, fix it by adding mpu_periphclk ("fixed-factor-clock") and use
>>> it for clocking ARM TWD and Global timer (same way as on OMAP4).
>>>
>>> Cc: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
>>> Cc: Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>
>>> Cc: Tero Kristo <t-kristo-l0cyMroinI0@public.gmane.org>
>>> Fixes:commit 8cbd4c2f6a99 ("arm: boot: dts: am4372: add ARM timers and SCU nodes")
>>> Signed-off-by: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>
>>
>> Is this fix alone enough or do you still need to disable other the ARM
>> timers in the board specific dts file?
>>
>
> This one is independent and it's required for -rc, because ARM TWD timer will be selected
> now for am43xx even if http://www.spinics.net/lists/arm-kernel/msg459649.html
> is not merged yet ;) in case of omap2plus_defconfig build.
>
>
Are there any comments objection?
Could this patch be merged as part of -rc cycle?
--
regards,
-grygorii
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next prev parent reply other threads:[~2015-12-08 17:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-30 15:56 [4.4-rc][PATCH v2] ARM: dts: am4372: fix clock source for arm twd and global timers Grygorii Strashko
[not found] ` <1448898998-32749-1-git-send-email-grygorii.strashko-l0cyMroinI0@public.gmane.org>
2015-12-03 16:35 ` Tony Lindgren
[not found] ` <20151203163551.GQ23396-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2015-12-03 18:04 ` Grygorii Strashko
[not found] ` <5660843E.3000801-l0cyMroinI0@public.gmane.org>
2015-12-08 17:41 ` Grygorii Strashko [this message]
2015-12-08 18:03 ` Felipe Balbi
[not found] ` <87wpsolsvo.fsf-HgARHv6XitJaoMGHk7MhZQC/G2K4zDHf@public.gmane.org>
2015-12-10 0:47 ` Tony Lindgren
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