linux-kernel - Re: [PATCH v4 3/7] mmc: mediatek: Add PM support for MMC driver

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Date:	Tue, 19 May 2015 13:55:29 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Chaotian Jing <chaotian.jing@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Chris Ball <chris@...ntf.net>,
	Mark Rutland <mark.rutland@....com>,
	James Liao <jamesjj.liao@...iatek.com>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Bin Zhang (章斌) <bin.zhang@...iatek.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 3/7] mmc: mediatek: Add PM support for MMC driver

On 19 May 2015 at 13:04, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> Hi Chaotian,
>
> On Tue, May 19, 2015 at 02:36:47PM +0800, Chaotian Jing wrote:
>> Add PM support for Mediatek MMC driver
>> Save/restore registers when PM
>
> Has anyone asked you to add a new driver in two steps? I find it hard to
> review if a driver is introduced and changed right afterwards.
> Presumably you find it hard to maintain the patches like this also.
> Please ignore if this is indeed requested by someone.

I requested it.

Primarily because I want to make sure we deal with runtime/system PM
support properly. I guess I have seen too many cases where
functionality is broken, unless compiled with CONFIG_PM* set.

Kind regards
Uffe
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