linux-kernel - Query dw_dmac driver: All descriptors done, but channel not idle!

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Message-ID: <4C1B75B7.1080104@st.com>
Date:	Fri, 18 Jun 2010 19:03:43 +0530
From:	Viresh KUMAR <viresh.kumar@...com>
To:	haavard.skinnemoen@...el.com,
	Dan Williams <dan.j.williams@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'Shiraz HASHIM'" <shiraz.hashim@...com>,
	Armando VISCONTI <armando.visconti@...com>
Subject: Query dw_dmac driver: All descriptors done, but channel not idle!

Hello,

We have Synopsys Designware DMAC Controller on ST SPEAr13xx platform.
When i run dmatest for all 8 channels then i see following error some times.

"dma dma0chan7: BUG: All descriptors done, but channel not idle!"

I saw the code in driver, and i think it looks to be a known issue for this
peripheral, that's why special handling is done in driver.

Can somebody please confirm, if it a known issue or not? Or if there
are some solutions for this problem.

viresh.
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