From mboxrd@z Thu Jan  1 00:00:00 1970
From: boris.brezillon@free-electrons.com (Boris Brezillon)
Date: Wed, 9 Mar 2016 12:06:27 +0100
Subject: [PATCH] dma: sun4i: expose block size and wait cycle
 configuration to DMA users
In-Reply-To: <20160308025547.GI11154@localhost>
References: <1457344771-12946-1-git-send-email-boris.brezillon@free-electrons.com>
 <20160307145429.GG11154@localhost>
 <20160307160857.577bb04d@bbrezillon>
 <20160307203024.GD8418@lukather> <20160308025547.GI11154@localhost>
Message-ID: <20160309120627.67612b1d@bbrezillon>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, 8 Mar 2016 08:25:47 +0530
Vinod Koul <vinod.koul@intel.com> wrote:
> 
> Why does dmaengine need to wait? Can you explain that

I don't have an answer for that one, but when I set WAIT_CYCLES to 1
for the NAND use case it does not work. So I guess it is somehow
related to how the DRQ line is controlled on the device side...

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com