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

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Message-ID: <4ECCD4F4.8080903@st.com>
Date:	Wed, 23 Nov 2011 16:41:48 +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 11/23/2011 4:19 PM, Vinod Koul wrote:
> then why not perform save and restore in your suspend and restore
> callbacks. That way you don't pay penalty of doing that in every alloc
> as you seem to be doing now?

Not actually. I am not saving anything to be restored after suspend.
There are few things (configuring CFG regs and enabling interrupts),
which are done earlier on alloc_channels. As this will not be called after
resume, so we need to set them again.

What i have done is, removed all this stuff from alloc channels and moved it
to dwc_dostart(). Here, i am checking if channel is already programmed or not.
If not (Can happen only in two cases: On resume and other on fresh channel alloc),
i configure them. So there is no save/restore actually done.

-- 
viresh
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