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From: Santosh Shilimkar <santosh.shilimkar@ti.com>
To: Kevin Hilman <khilman@linaro.org>
Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: OMAP4: PM: Avoid expensive cpu_suspend() path for all CPU power states except off
Date: Tue, 12 Feb 2013 10:25:09 +0530	[thread overview]
Message-ID: <5119CB2D.9040001@ti.com> (raw)
In-Reply-To: <87d2wazep6.fsf@linaro.org>

On Saturday 09 February 2013 02:49 AM, Kevin Hilman wrote:
> Santosh Shilimkar <santosh.shilimkar@ti.com> writes:
>
>> Current CPU PM code code make use of common cpu_suspend() path for all the
>> CPU power states which is not optimal. In fact cpu_suspend() path is needed
>> only when we put CPU power domain to off state where the CPU context is lost.
>>
>> Update the code accordingly so that the expensive cpu_suspend() path
>> can be avoided for the shallow CPU power states like CPU PD INA/CSWR.
>>
>> Cc: Kevin Hilman <khilman@deeprootsystems.com>
>>
>> Reported-by: Richard Woodruff <r-woodruff2@ti.com>
>> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
>
> Looks OK at first glance, but are you sure this is right for the
> various ways both clusters might idle using coupled CPUidle?
>
Yes it is perfectly safe from all C-states. This patch has been part of
the OMAP4/OMAP5 product port for some time. I forgot to send it upstream
some how :(

> Some description of the testing would be helpful here.
>
Sorry. Should have mentioned it in first place.
Patch is being tested on OMAP4430 (idle/suspend) and OMAP5 with
few out of tree patches.

Regards,
Santosh

WARNING: multiple messages have this Message-ID (diff)
From: santosh.shilimkar@ti.com (Santosh Shilimkar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: OMAP4: PM: Avoid expensive cpu_suspend() path for all CPU power states except off
Date: Tue, 12 Feb 2013 10:25:09 +0530	[thread overview]
Message-ID: <5119CB2D.9040001@ti.com> (raw)
In-Reply-To: <87d2wazep6.fsf@linaro.org>

On Saturday 09 February 2013 02:49 AM, Kevin Hilman wrote:
> Santosh Shilimkar <santosh.shilimkar@ti.com> writes:
>
>> Current CPU PM code code make use of common cpu_suspend() path for all the
>> CPU power states which is not optimal. In fact cpu_suspend() path is needed
>> only when we put CPU power domain to off state where the CPU context is lost.
>>
>> Update the code accordingly so that the expensive cpu_suspend() path
>> can be avoided for the shallow CPU power states like CPU PD INA/CSWR.
>>
>> Cc: Kevin Hilman <khilman@deeprootsystems.com>
>>
>> Reported-by: Richard Woodruff <r-woodruff2@ti.com>
>> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
>
> Looks OK at first glance, but are you sure this is right for the
> various ways both clusters might idle using coupled CPUidle?
>
Yes it is perfectly safe from all C-states. This patch has been part of
the OMAP4/OMAP5 product port for some time. I forgot to send it upstream
some how :(

> Some description of the testing would be helpful here.
>
Sorry. Should have mentioned it in first place.
Patch is being tested on OMAP4430 (idle/suspend) and OMAP5 with
few out of tree patches.

Regards,
Santosh

  reply	other threads:[~2013-02-12  4:53 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-08 15:11 [PATCH] ARM: OMAP2+: PM: Fix the dt return condition in pm_late_init() Santosh Shilimkar
2013-02-08 15:11 ` Santosh Shilimkar
2013-02-08 15:11 ` [PATCH] ARM: OMAP2+: Remove duplicate omap4430_init_late() declaration Santosh Shilimkar
2013-02-08 15:11   ` Santosh Shilimkar
2013-02-08 15:21   ` Felipe Balbi
2013-02-08 15:21     ` Felipe Balbi
2013-02-15  9:35   ` Santosh Shilimkar
2013-02-15  9:35     ` Santosh Shilimkar
2013-03-04 18:19     ` Tony Lindgren
2013-03-04 18:19       ` Tony Lindgren
2013-02-08 15:11 ` [PATCH] ARM: OMAP4: PM: Avoid expensive cpu_suspend() path for all CPU power states except off Santosh Shilimkar
2013-02-08 15:11   ` Santosh Shilimkar
2013-02-08 15:26   ` Felipe Balbi
2013-02-08 15:26     ` Felipe Balbi
2013-02-08 15:34     ` Santosh Shilimkar
2013-02-08 15:34       ` Santosh Shilimkar
2013-02-08 21:19   ` Kevin Hilman
2013-02-08 21:19     ` Kevin Hilman
2013-02-12  4:55     ` Santosh Shilimkar [this message]
2013-02-12  4:55       ` Santosh Shilimkar
2013-02-12 15:18       ` Kevin Hilman
2013-02-12 15:18         ` Kevin Hilman
2013-02-13  5:05         ` Santosh Shilimkar
2013-02-13  5:05           ` Santosh Shilimkar
2013-02-08 15:20 ` [PATCH] ARM: OMAP2+: PM: Fix the dt return condition in pm_late_init() Felipe Balbi
2013-02-08 15:20   ` Felipe Balbi
2013-02-08 15:34 ` Paul Walmsley
2013-02-08 15:34   ` Paul Walmsley
2013-02-08 15:36   ` Santosh Shilimkar
2013-02-08 15:36     ` Santosh Shilimkar

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