serial: imx: always restart DMA if more data is available

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Simplify the DMA restart logic to always queue up the next transfer
immediately if there is at least one more byte available in the FIFO,
so that the transfer will finish in a limited time.

This way the driver stops to rely on zero length transfers to signal
transfers ends. Those will go away when the idle detect DMA requests
are disabled.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Lucas Stach 2015-09-04 17:52:39 +02:00 • committed by Greg Kroah-Hartman

parent 86a04ba642

commit 976b39cd5b

1 changed files with 11 additions and 14 deletions

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drivers/tty/serial/imx.c

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