serial: 8250_mxpcie: speed up RX using memory-mapped FIFO window

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The MUEx50 UART provides a memory-mapped RX FIFO data window along with
an RX FIFO byte counter.

When no break or error conditions are present, read received data in
bulk via the MMIO FIFO window and push it to the tty layer in one
operation. Fall back to the generic 8250 RX path for break and error
handling.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-8-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Crescent Hsieh 2026-07-31 15:48:13 +08:00 • committed by Greg Kroah-Hartman

parent e8224757c6

commit c016f2405c

1 changed files with 30 additions and 2 deletions

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

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