tty: serial: fsl_lpuart: skip waiting for transmission complete when UARTCTRL_SBK is asserted

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commit 2411fd94ce upstream.

According to LPUART RM, Transmission Complete Flag becomes 0 if queuing
a break character by writing 1 to CTRL[SBK], so here need to skip
waiting for transmission complete when UARTCTRL_SBK is asserted,
otherwise the kernel may stuck here.
And actually set_termios() adds transmission completion waiting to avoid
data loss or data breakage when changing the baud rate, but we don't
need to worry about this when queuing break characters.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20230223093941.31790-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sherry Sun 2023-02-23 17:39:41 +08:00 • committed by Greg Kroah-Hartman

parent 2a36b444ca

commit c5e655f423

1 changed files with 9 additions and 3 deletions

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drivers/tty/serial/fsl_lpuart.c

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