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SubjectRe: [PATCH] usb: musb: Disable pullup in gadget setup
Hi Bin,


Le mar. 30 avril 2019 à 11:05, Bin Liu <b-liu@ti.com> a écrit :
> Hi Paul,
>
> On Thu, Apr 04, 2019 at 11:10:46AM -0500, Bin Liu wrote:
>> On Thu, Apr 04, 2019 at 11:37:43AM +0200, Paul Cercueil wrote:
>> > The pullup may be already enabled before the driver is
>> initialized.
>> > It has to be disabled at init time, as we cannot guarantee that a
>> gadget
>> > driver will be bound to the UDC.
>> >
>> > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>> > ---
>> > drivers/usb/musb/musb_gadget.c | 1 +
>> > 1 file changed, 1 insertion(+)
>> >
>> > diff --git a/drivers/usb/musb/musb_gadget.c
>> b/drivers/usb/musb/musb_gadget.c
>> > index ffe462a657b1..094dc59c834c 100644
>> > --- a/drivers/usb/musb/musb_gadget.c
>> > +++ b/drivers/usb/musb/musb_gadget.c
>> > @@ -1794,6 +1794,7 @@ int musb_gadget_setup(struct musb *musb)
>> >
>> > musb->is_active = 0;
>> > musb_platform_try_idle(musb, 0);
>> > + musb_pullup(musb, 0);
>> >
>> > status = usb_add_gadget_udc(musb->controller, &musb->g);
>> > if (status)
>>
>> Applied.
>
> Sorry, I have dropped this patch from my tree. I realized the gadget
> core already defines callbacks to control the pullup. I think the
> proper fix should be calling usb_udc_vbus_handler() in musb gadget or
> glue layers.
>
> -Bin.

usb_udc_vbus_handler() requires a usb_gadget *, I don't see where I can
get that from the struct musb.

Besides, the point is to have the pullup disabled before a gadget is
bound,
so I don't understand why you suggest that?

-Paul


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