Marnix Rijnart 8a28894aba serial: 8250_pci: Fix broken RS485 for F81504/508/512 ...

commit 27aff0a56b upstream.

Fintek F81504/508/512 can support both RTS_ON_SEND and RTS_AFTER_SEND,
but pci_fintek_rs485_supported only announces the former.

This makes it impossible to unset SER_RS485_RTS_ON_SEND from
userspace because of uart_sanitize_serial_rs485(). Some devices
with these chips need RTS low on TX, so they are effectively broken.

Fix this by announcing the support for SER_RS485_RTS_AFTER_SEND,
similar to commit 068d35a7be ("serial: sc16is7xx: announce support
for SER_RS485_RTS_ON_SEND").

Fixes: 4afeced55b ("serial: core: fix sanitizing check for RTS settings")
Cc: stable <stable@kernel.org>
Signed-off-by: Marnix Rijnart <marnix.rijnart@iwell.eu>
Link: https://patch.msgid.link/20260112000931.61703-1-marnix.rijnart@iwell.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-01-30 10:28:40 +01:00

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hvc

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ipwireless

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serdev

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serial

serial: 8250_pci: Fix broken RS485 for F81504/508/512

2026-01-30 10:28:40 +01:00

vt

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amiserial.c

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ehv_bytechan.c

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goldfish.c

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Kconfig

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Makefile

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mips_ejtag_fdc.c

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moxa.c

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mxser.c

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n_gsm.c

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n_hdlc.c

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n_null.c

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n_tty.c

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nozomi.c

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pty.c

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rpmsg_tty.c

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synclink_gt.c

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sysrq.c

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tty_audit.c

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tty_baudrate.c

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tty_buffer.c

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tty_io.c

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tty_ioctl.c

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tty_jobctrl.c

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tty_ldisc.c

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tty_ldsem.c

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tty_mutex.c

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tty_port.c

tty: fix tty_port_tty_*hangup() kernel-doc

2026-01-08 10:15:01 +01:00

tty.h

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ttynull.c

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vcc.c

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