From: James Hogan <james.hogan@imgtec.com>
Date: Wed, 29 Jun 2011 08:28:43 +0000 (+0100)
Subject: mmc: dw_mmc: fix stop when fallen back to PIO
X-Git-Tag: v3.1-rc1~321^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03e8cb534e7cc3f71a07528a44da7ce68e5b5708;p=pandora-kernel.git

mmc: dw_mmc: fix stop when fallen back to PIO

There are several situations when dw_mci_submit_data_dma() decides to
fall back to PIO mode instead of using DMA, due to a short (to avoid
overhead) or "complex" (e.g. with unaligned buffers) transaction, even
though host->use_dma is set. However dw_mci_stop_dma() decides whether
to stop DMA or set the EVENT_XFER_COMPLETE event based on host->use_dma.
When falling back to PIO mode this results in data timeout errors
getting missed and the driver locking up.

Therefore add host->using_dma to indicate whether the current
transaction is using dma or not, and adjust dw_mci_stop_dma() to use
that instead.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
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