From bf83fd6402a856eeb9a22c364c50ccf9bbdf9b17 Mon Sep 17 00:00:00 2001
From: Qipan Li <Qipan.Li@csr.com>
Date: Mon, 14 Apr 2014 14:30:01 +0800
Subject: [PATCH] spi: sirf: fix spi full-duplex DMA transferring issue

sometimes t->tx can be equal with t->rx. for example, spidev will make
tx and rx point to spidev->buffer at the same time. currently, for this
case, we map the buffer BIDIRECTION to fix the cache consistency.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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