linux-kernel - Re: [PATCH 0/9] ARM: vf610: Suspend/resume support

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Date:	Sun, 28 Sep 2014 11:15:10 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Stefan Agner <stefan@...er.ch>
CC:	<kernel@...gutronix.de>, <linus.walleij@...aro.org>,
	<gnurou@...il.com>, <linux@....linux.org.uk>,
	<jingchang.lu@...escale.com>, <b20788@...escale.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 0/9] ARM: vf610: Suspend/resume support

On Mon, Sep 22, 2014 at 07:09:21PM +0200, Stefan Agner wrote:
> This patchset provides suspend/resume support for Freescale Vybrid
> SoC (vf610). The code is generally aligned to the implementation
> for i.MX6. The subsystems SRC and GPC need some changes to support
> the Vybrid specific implementation.
> 
> This patchset relies on GPIO driver to be present (in order to
> provide a wakeup source) as well as using the ARM Global Timer
> clock source (the Vybrid specifc PIT clock source, vf_pit_timer.c
> does not support shutdown).
> 
> The implemented sleep states (LP-RUN and STOP), are not the most
> power saving functions available on Vybrid. Especially for
> suspend-to-memory one of the LPSTOP modes looks more appropriate.
> However, the complexity is somewhat higher (we would need to move
> execution path to SRAM and store IOMUX and DDRMC configuration).
> Currently, I have not the resources to look into that so I hope
> that this initial code qualifies as power saving functions to be
> applied.

So you have quite a lot of unnecessary code which is only needed by
suspend from SRAM (store IOMUX and DDRMC configuration).

Not happy with that.

Shawn
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