linux-kernel - [Query]: What should we do in txd->tx_submit() and device_issue

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Message-ID: <4E254067.1060408@st.com>
Date:	Tue, 19 Jul 2011 13:59:27 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	"Koul, Vinod" <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Armando VISCONTI <armando.visconti@...com>
Subject: [Query]: What should we do in txd->tx_submit() and device_issue_pending()

Hi Dan/Vinod,

I have one query regarding implementation of few routines in DMA drivers.

What the exact purpose of txd->tx_submit() and device_issue_pending() routines?

Should tx_submit() always start physical transfer (Obviously, if channel is free)?
Or should it just queue requests and then finally a call to device_issue_pending()
must start physical transfers?

-- 
viresh
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