tty: serial: fsl_lpuart: disable transmitter before changing RS485 related registers

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According to the LPUART reference manual, TXRTSE and TXRTSPOL of MODIR
register only can be changed when the transmitter is disabled.
So disable the transmitter before changing RS485 related registers and
re-enable it after the change is done.

Fixes: 67b0183786 ("tty: serial: lpuart: Add RS485 support for 32-bit uart flavour")
Cc: stable <stable@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250312022503.1342990-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sherry Sun 2025-03-12 10:25:03 +08:00 • committed by Greg Kroah-Hartman

parent 5c7e289648

commit f5cb528d64

1 changed files with 17 additions and 0 deletions

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drivers/tty/serial/fsl_lpuart.c

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