From: Rabin Vincent <rabin.vincent@stericsson.com>
Date: Thu, 17 May 2012 08:17:38 +0000 (+0530)
Subject: dmaengine: ste_dma40: don't allow high priority dest event lines
X-Git-Tag: v3.9-rc1~80^2~25^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ccc3d6976433aa67131117fccd2b5143d82a6f48;p=pandora-kernel.git

dmaengine: ste_dma40: don't allow high priority dest event lines

Hardware bug: when a logical channel is triggerred by a high priority
destination event line, an extra packet transaction is generated in case
of important data write response latency on previous logical channel A
and if the source transfer of current logical channel B is already
completed and if no other channel with a higher priority than B is
waiting for execution.

Software workaround: do not set the high priority level for the
destination event lines that trigger logical channels.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
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