From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 9 Jul 2014 10:26:22 +0000 (+0200)
Subject: spi: rspi: Handle dmaengine_prep_slave_sg() failures gracefully
X-Git-Tag: cleanup-for-v3.18~116^2~1^6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85912a88c1ebcad04a5cfec971771195ce8d6691;p=pandora-kernel.git

spi: rspi: Handle dmaengine_prep_slave_sg() failures gracefully

As typically a shmobile SoC has less DMA channels than devices that can use
DMA, we may want to prioritize access to the DMA channels in the future.
This means that dmaengine_prep_slave_sg() may start failing arbitrarily.

Handle dmaengine_prep_slave_sg() failures gracefully by falling back to
PIO.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

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