linux-kernel - Re: [PATCH] dmaengine/ste_dma40: support pm in dma40

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Message-ID: <20111117064001.GA17619@bnru01>
Date:	Thu, 17 Nov 2011 12:10:02 +0530
From:	Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Rabin VINCENT <rabin.vincent@...ricsson.com>
Subject: Re: [PATCH] dmaengine/ste_dma40: support pm in dma40

On Thu, Nov 17, 2011 at 06:23:52 +0100, Vinod Koul wrote:
> runtime pm manages the device power management. It will call your
> suspend/resume callbacks when your device is idle/active and manages the
> device usage for you.
> Within your device you need to do your own management, which should be
> linked to channel being active. You should not club the two.
> 
> I am not sure if the clock framework can help you on this

Instead of switching on and off eventlines very frequently, I'll
do it in the runtime_suspend() and runtime_resume(), so that it
looks more neat and can get away with these usage counters.
I will re-work and submit a new version of this patch.

~Narayanan
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