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

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The MUEx50 UART provides a memory-mapped TX FIFO data window along with
a TX FIFO level counter.

Fill the TX FIFO in bulk via the MMIO FIFO window based on available
FIFO space, using uart_port_tx_limited() for the common serial-core TX
handling.

Signed-off-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260731074820.735619-9-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Crescent Hsieh 2026-07-31 15:48:14 +08:00 • committed by Greg Kroah-Hartman

parent c016f2405c

commit 7df53c4d33

1 changed files with 15 additions and 1 deletions

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

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