spi: dw-mid: follow new DMAengine workflow
Though intel-mid-dma does not follow a new DMA workflow (*) let's prepare SPI DW driver for that. (*) The client is obliged to call dma_async_issue_pending() which starts the actual transfers. Old DMA drivers do not follow this, since requirement was introduced in the discussion of [1]. [1] http://www.spinics.net/lists/arm-kernel/msg125987.htmlSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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