linux-kernel - Re: [PATCH V2 08/20] dmaengine/amba-pl08x: support runtime PM

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Message-ID: <4E3A5B89.9000703@st.com>
Date:	Thu, 4 Aug 2011 14:12:49 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Pratyush ANAND <pratyush.anand@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vipin KUMAR <vipin.kumar@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Amit VIRDI <Amit.VIRDI@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	Deepak SIKRI <deepak.sikri@...com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2 08/20] dmaengine/amba-pl08x: support runtime PM

On 08/04/2011 12:58 PM, Koul, Vinod wrote:
>> > 
>> > Until this point we are not touching the registers at all. And they will
>> > accessed after this point only.
> But from maintainability POV it should be at the start.
> 

Sorry for missing this earlier, I looked at the code again and
realized why i put it at the end of the routine.

The routine looks like this

        for (all channels)
                if (!ch->serving)
                        break;

        if (i == pl08x->vd->channels) {
                /* No physical channel available, cope with it */
                return NULL;
        }

        pm_runtime_get_sync(&pl08x->adev->dev);

So, this has to be put at end only. We don't want to call this if no physical
channel is free.

-- 
viresh
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