[3/3] usb: dwc3: Support option to disable USB2 LPM

[Oliver Neukum <oneukum@suse.com>]

On Do, 2018-11-08 at 12:47 +0200, Felipe Balbi wrote:

Hi,

> Oliver Neukum <oneukum@suse.com> writes:
> > On Mi, 2018-11-07 at 18:10 -0800, Thinh Nguyen wrote:
> > > 
> > > --- a/drivers/usb/dwc3/core.h
> > > +++ b/drivers/usb/dwc3/core.h
> > > @@ -971,6 +971,7 @@ struct dwc3_scratchpad_array {
> > >   * @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
> > >   * @three_stage_setup: set if we perform a three phase setup
> > >   * @usb3_lpm_capable: set if hadrware supports Link Power Management
> > > + * @usb2_lpm_disable: set to disable usb2 lpm
> > >   * @disable_scramble_quirk: set if we enable the disable scramble quirk
> > >   * @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
> > >   * @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
> > > @@ -1146,6 +1147,7 @@ struct dwc3 {
> > >         unsigned                setup_packet_pending:1;
> > >         unsigned                three_stage_setup:1;
> > >         unsigned                usb3_lpm_capable:1;
> > > +       unsigned                usb2_lpm_disable:1;
> > 
> > Hi,
> > 
> > that may be a bit late, but why would this be a property of dwc3?
> > Now, you may want to do this for a specific controller,
> > but there is no reason to limit the flag to dwc3. We want this
> > flag in the generic HCD attributes, so that other HCDs can share
> > it. Maybe even expose it to sysfs.
> 
> this is used for the peripheral side of dwc3 too.

same argument. Whether a gadget supports LPM is a question
in no way specific to dwc3. And whether this exposes internal
registers does not really matter. It is a capability of the HC
for a generic issue.

	Regards
		Oliver