tty: serial: tegra: Activate RX DMA transfer by request
This allows DMA engine to go into runtime-suspended mode whenever there is no data to receive, instead of keeping DMA active all the time while TTY is opened (i.e. permanently active in practice, like in the case of UART Bluetooth). Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20200112180919.5194-2-digetx@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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