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| /openbmc/linux/drivers/usb/serial/ |
| H A D | cp210x.c | diff 5951b8508855799fbb2d6a9553ab3b7af595ea94 Mon Jan 25 07:48:11 CST 2021 Johan Hovold <johan@kernel.org> USB: serial: cp210x: suppress modem-control errors
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>
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