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serial: imx-serial - update RX error counters when DMA is used
Update error counters when DMA is used for receiving data. Do this by using DMA transaction error event instead error interrupts to reduce interrupt load. Tested-by: Peter Senna Tschudin <peter.senna@collabora.com> Acked-by: Peter Senna Tschudin <peter.senna@collabora.com> Signed-off-by: Nandor Han <nandor.han@ge.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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