tty: serial: fsl_lpuart: Use cyclic DMA for Rx

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The initial approach of DMA implementatin for RX is inefficient due to switching
from PIO to DMA, this leads to overruns especially on instances with the smaller
FIFO. To address these issues this patch uses a cyclic DMA for receiver path.

Some part of the code is borrowed from atmel serial driver.

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Bhuvanchandra DV

2016-07-19 13:13:07 +05:30

committed by Greg Kroah-Hartman

parent aa9e7d7803

commit 5887ad43ee

1 changed files with 258 additions and 225 deletions

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drivers/tty/serial/fsl_lpuart.c

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