serial: imx: implement shadow registers for UCRx and UFCR

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This reduces the amount of read accesses to the register space by
shadowing the values for five registers that only change on writing
them. There is a single bit in UCR2 that might change without being
written to it, this is handled accordingly.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Uwe Kleine-König 2018-03-02 11:07:20 +01:00 • committed by Greg Kroah-Hartman

parent 27c844261b

commit 3a0ab62f43

1 changed files with 59 additions and 1 deletions

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drivers/tty/serial/imx.c

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