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To support multi-size buffers in the mx3_camera V4L2 driver we have to be able to stop DMA on a channel without releasing descriptors and completely halting the hardware. Use the DMA_PAUSE control to implement this mode. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>