linux-kernel - Re: [PATCH/RESEND #3 1/7] OMAP3+: PM: SR: add suspend/resume handlers

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Date:	Fri, 18 Nov 2011 18:35:53 -0600
From:	"Menon, Nishanth" <nm@...com>
To:	Kevin Hilman <khilman@...com>
Cc:	Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH/RESEND #3 1/7] OMAP3+: PM: SR: add suspend/resume handlers

On Wed, Nov 16, 2011 at 18:02, Kevin Hilman <khilman@...com> wrote:
> Felipe Balbi <balbi@...com> writes:
>
>> From: Nishanth Menon <nm@...com>
>>
>> SmartReflex should be disabled while entering low power mode due to
>> the following reasons:
> [...]
>
> Nishanth, in the end, didn't you decide to drop this patch?
>

Yes, I did eventually, once we implemented DVFS for GPU, Ducati, HSI,
and other drivers, there was no real way to ensure sequence of suspend
sequencing even after moving this to suspend_noirq. some of the other
reasons:

if I disabled Smartreflex and went to Nominal voltage on MPU, and say
MPU was at "performance" mode of 1.5GHz or so, thermal scenarios got
worse due on hot corner samples - these tend to have higher leakage
and thermal characteristics tend to be more pronounced. The option of
throttling frequency down while suspend was not really a good option
in comparison to switching off smart reflex in the last possible
moment - in pmxxx.c

Regards,
Nishanth Menon
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