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Request the DMA channel in the PCM open callback instead of the hwparams callback, this allows us to let open fail if no dma channel is available. This also fixes a bug where the channel will be requested multiple times if hwparams is called multiple times. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>