serial: 8250_mxpcie: offload XON/XOFF flow control to MUEx50 hardware

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The MUEx50 UART can handle in-band software flow control (XON/XOFF)
directly in hardware.

Program the on-chip XON/XOFF characters from termios settings and enable
the corresponding MUEx50 flow control modes when IXON or IXOFF is
requested. Provide throttle and unthrottle callbacks so RX can be
stopped and resumed cleanly.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-6-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Crescent Hsieh 2026-07-31 15:48:11 +08:00 • committed by Greg Kroah-Hartman

parent 55edf8511f

commit d98cf22e68

1 changed files with 50 additions and 3 deletions

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drivers/tty/serial/8250/8250_mxpcie.c

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