linux-kernel - Re: [PATCH] dmaengine/dw_dmac: Reconfigure interrupt and chan

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Message-ID: <4ECB3F1F.9060806@st.com>
Date:	Tue, 22 Nov 2011 11:50:15 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Armando VISCONTI <armando.visconti@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Vipin KUMAR <vipin.kumar@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Deepak SIKRI <deepak.sikri@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	Amit VIRDI <Amit.VIRDI@...com>,
	Pratyush ANAND <pratyush.anand@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>,
	Bhavna YADAV <bhavna.yadav@...com>,
	Vincenzo FRASCINO <Vincenzo.FRASCINO@...com>,
	Mirko GARDI <mirko.gardi@...com>
Subject: Re: [PATCH] dmaengine/dw_dmac: Reconfigure interrupt and chan_cfg
 register on resume

On 11/22/2011 9:43 AM, Vinod Koul wrote:
> On Thu, 2011-11-17 at 16:01 +0530, Viresh Kumar wrote:
>> > In S2R all DMA registers are reset by hardware and thus they are required to be
> When are they reset, whenever you leave channel idle or once you come
> back from suspend?

Whenever we do S2R, many power islands are switched off and so DMAC controller looses
all its power. On resume, all registers are in their reset state.

-- 
viresh
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