Re: [PATCH] USB: dummy-hcd: fix power budget for SuperSpeed mode

From: Alan Stern
Date: Wed Sep 04 2019 - 10:21:43 EST


On Wed, 4 Sep 2019, Felipe Balbi wrote:

>
> Hi,
>
> <Jacky.Cao@xxxxxxxx> writes:
>
> > The power budget for SuperSpeed mode should be 900 mA
> > according to USB3.0 specification, so set the power
> > budget to 900 mA for dummy_start_ss which is only used
> > for SuperSpeed mode.
> >
> > If the max power consumption of SuperSpeed device is
> > larger than 500 mA, insufficient available bus power
> > error happens in usb_choose_configuration function
> > when the device connects to dummy hcd.
> >
> > Signed-off-by: Jacky Cao <Jacky.Cao@xxxxxxxx>
> > ---
> > drivers/usb/gadget/udc/dummy_hcd.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
> > index 8414fac..52f2cf5 100644
> > --- a/drivers/usb/gadget/udc/dummy_hcd.c
> > +++ b/drivers/usb/gadget/udc/dummy_hcd.c
> > @@ -48,6 +48,7 @@
> > #define DRIVER_VERSION "02 May 2005"
> >
> > #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
> > +#define POWER_BUDGET_3_0 900 /* in mA */
> >
> > static const char driver_name[] = "dummy_hcd";
> > static const char driver_desc[] = "USB Host+Gadget Emulator";
> > @@ -2432,7 +2433,7 @@ static int dummy_start_ss(struct dummy_hcd *dum_hcd)
> > dum_hcd->rh_state = DUMMY_RH_RUNNING;
> > dum_hcd->stream_en_ep = 0;
> > INIT_LIST_HEAD(&dum_hcd->urbp_list);
> > - dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
> > + dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3_0;
> > dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
> > dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
> > #ifdef CONFIG_USB_OTG
>
> Alan, I suppose you're okay with this change?

Yes. Except that I think the name POWER_BUDGET_3_0 is a little odd.
It implies that this change is specific to USB 3.0 -- but it isn't.
USB 3.1 and 3.2 also have a 900 mA limit, right?

So please consider changing the name to POWER_BUDGET_3.

Alan Stern