tty: serial: fsl_lpuart: Clear the error flags by writing 1 for lpuart32 platforms

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commit 282069845a upstream.

Do not read the data register to clear the error flags for lpuart32
platforms, the additional read may cause the receive FIFO underflow
since the DMA has already read the data register.
Actually all lpuart32 platforms support write 1 to clear those error
bits, let's use this method to better clear the error flags.

Fixes: 42b68768e5 ("serial: fsl_lpuart: DMA support for 32-bit variant")
Cc: stable <stable@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230801022304.24251-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sherry Sun 2023-08-01 10:23:04 +08:00 • committed by Greg Kroah-Hartman

parent 31311a9a4b

commit 0693c8f134

1 changed files with 2 additions and 2 deletions

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drivers/tty/serial/fsl_lpuart.c

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