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SubjectRe: [PATCH] USB: serial: ftdi_sio: Fix GPIO not working in autosuspend
On Mon, Jan 14, 2019 at 02:48:21PM +0100, Johan Hovold wrote:
> On Mon, Jan 14, 2019 at 01:30:03PM +0100, Karoly Pados wrote:
> > There is a bug in the current GPIO code for ftdi_sio: it failed to take USB
> > autosuspend into account. If the device is in autosuspend, calls to
> > usb_control_msg() fail with -EHOSTUNREACH. Because the standard value for
> > autosuspend timeout is usually 2-5 seconds, this made it almost impossible
> > to use the GPIOs on machines that have USB autosuspend enabled. This patch
> > fixes the issue by acquiring a PM lock on the device for the duration of
> > the USB transfers. Tested on an FT231X device.
> >
> > Signed-off-by: Karoly Pados <>

Do you intend to send a corresponding fix for cp210x as well?


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