USB: serial: cp210x: suppress modem-control errors

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The CP210X_SET_MHS request cannot be used to control RTS when hardware
flow control (auto-RTS) is enabled and instead returns an error which is
currently logged as:

	cp210x ttyUSB0: failed set request 0x7 status: -32

when opening and closing a port (and on TIOCMSET requests).

Add a crtscts flag to keep track of the hardware flow-control setting
and use it to suppress any request to change RTS when auto-RTS is
enabled.

Note that RTS is still deasserted when disabling the UART as part of
close.

Reported-by: Pho Tran <pho.tran@silabs.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

...

This commit is contained in:

Johan Hovold 2021-01-25 14:48:11 +01:00

parent fea7372cbc

commit 5951b85088

1 changed files with 30 additions and 3 deletions

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33

drivers/usb/serial/cp210x.c

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