USB: serial: cp210x: fix modem-control handling

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The vendor request used to set the flow-control settings also sets the
state of the modem-control lines.

Add state variables to keep track of the modem-control lines to avoid
always asserting the lines whenever the flow-control settings are
updated.

This specifically also avoids asserting DTR/RTS when opening a port with
the line speed set to B0.

Signed-off-by: Johan Hovold <johan@kernel.org>

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This commit is contained in:

Johan Hovold 2021-01-25 14:48:12 +01:00

parent 5951b85088

commit 8cce3bbfb4

1 changed files with 16 additions and 4 deletions

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drivers/usb/serial/cp210x.c

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