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dmaengine: imx-sdma: refine to load context only once
The context loaded only one time before channel running,but currently sdma_config_channel() and dma_prep_* duplicated with sdma_load_context(), so refine it to load context only one time before channel running and reload after the channel terminated. Signed-off-by: Robin Gong <yibin.gong@nxp.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
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