From: Markus Pargmann <mpa@pengutronix.de>
Date: Tue, 29 Oct 2013 07:47:47 +0000 (+0100)
Subject: dma: mxs-dma: Fix channel reset hardware bug
X-Git-Tag: v3.13-rc1~29^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=702e94d66b555622ca6830de3095b5f0bb2ff6d7;p=pandora-kernel.git

dma: mxs-dma: Fix channel reset hardware bug

This is no official errata, but I noticed that the channel reset may
stop working if the DMA state engine is in the READ_FLUSH state.

This patch uses the channel debug1 register to wait for the DMA
statemachine to leave the READ_FLUSH state. After that we can continue
to reset the channel.

Tested on i.MX28.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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