From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: "Steven J. Hill" <Steven.Hill@imgtec.com>,
<linux-mips@linux-mips.org>, <ralf@linux-mips.org>
Subject: Re: [PATCH v2] MIPS: GIC: Select R4K counter as fallback.
Date: Thu, 12 Sep 2013 11:23:53 -0700 [thread overview]
Message-ID: <523206B9.6000201@imgtec.com> (raw)
In-Reply-To: <52316D28.5000100@metafoo.de>
On 09/12/2013 12:28 AM, Lars-Peter Clausen wrote:
> On 09/11/2013 09:51 PM, Steven J. Hill wrote:
>> From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
>>
>> If CONFIG_CSRC_GIC is selected and the GIC is not found during
>> boot, then fallback to the R4K counter gracefully.
> Is there any reason not to always register the r4k clocksource, no matter
> whether the gic clocksource is present or not? The timekeeping core of the
> kernel will make sure to use the best available clocksource based on the
> clocksource's rating.
>
> - Lars
If you do power saving by switching some core OFF then you should do an
additional clock sync after core revival.
GIC is free from that but R4K is not. It was a primary reason for GIC
clocksource.
- Leonid.
WARNING: multiple messages have this Message-ID (diff)
From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: "Steven J. Hill" <Steven.Hill@imgtec.com>,
linux-mips@linux-mips.org, ralf@linux-mips.org
Subject: Re: [PATCH v2] MIPS: GIC: Select R4K counter as fallback.
Date: Thu, 12 Sep 2013 11:23:53 -0700 [thread overview]
Message-ID: <523206B9.6000201@imgtec.com> (raw)
Message-ID: <20130912182353.pH7pxSclRkobZjyT0gv9S06xnmNJ1xE89yfHpDWvISk@z> (raw)
In-Reply-To: <52316D28.5000100@metafoo.de>
On 09/12/2013 12:28 AM, Lars-Peter Clausen wrote:
> On 09/11/2013 09:51 PM, Steven J. Hill wrote:
>> From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
>>
>> If CONFIG_CSRC_GIC is selected and the GIC is not found during
>> boot, then fallback to the R4K counter gracefully.
> Is there any reason not to always register the r4k clocksource, no matter
> whether the gic clocksource is present or not? The timekeeping core of the
> kernel will make sure to use the best available clocksource based on the
> clocksource's rating.
>
> - Lars
If you do power saving by switching some core OFF then you should do an
additional clock sync after core revival.
GIC is free from that but R4K is not. It was a primary reason for GIC
clocksource.
- Leonid.
next prev parent reply other threads:[~2013-09-13 6:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-11 19:51 [PATCH v2] MIPS: GIC: Select R4K counter as fallback Steven J. Hill
2013-09-12 6:34 ` John Crispin
2013-09-12 7:28 ` Lars-Peter Clausen
2013-09-12 7:33 ` John Crispin
2013-09-12 7:38 ` Lars-Peter Clausen
2013-09-12 8:04 ` John Crispin
2013-09-12 18:23 ` Leonid Yegoshin [this message]
2013-09-12 18:23 ` Leonid Yegoshin
2013-09-13 7:52 ` Lars-Peter Clausen
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