Hi,
> From: Roger Quadros
> Sent: Thursday, April 14, 2016 8:00 PM
>
> On 14/04/16 11:36, Yoshihiro Shimoda wrote:
> > Hi,
> >
< snip >
> > diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> > index e3d0161..8b74715 100644
> > --- a/drivers/usb/common/common.c
> > +++ b/drivers/usb/common/common.c
> > @@ -233,6 +233,8 @@ int of_usb_update_otg_caps(struct device_node *np,
> > if (of_find_property(np, "adp-disable", NULL) ||
> > (otg_caps->otg_rev < 0x0200))
> > otg_caps->adp_support = false;
> > + if (of_find_property(np, "hcd-needs-companion", NULL))
> > + otg_caps->needs_companion = true;
>
> I'm not sure if otg_caps structure is a right place for this. Maybe Peter can
> confirm
> if this is OK or not.
>
> I was thinking more about adding this bit in the otg_config structure.
I see. I also think the otg_config is more suitable.
> >
> > return 0;
> > }
> > diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
> > index 41e762a..e0df839 100644
> > --- a/drivers/usb/common/usb-otg.c
> > +++ b/drivers/usb/common/usb-otg.c
> > @@ -823,13 +823,15 @@ int usb_otg_register_hcd(struct usb_hcd *hcd,
> > unsigned int irqnum,
> > /* HCD will be started by OTG fsm when needed */
> > mutex_lock(&otg->fsm.lock);
> > if (otg->primary_hcd.hcd) {
> > - /* probably a shared HCD ? */
> > - if (usb_otg_hcd_is_primary_hcd(hcd)) {
> > + /* probably a shared HCD or a companion OHCI HCD ? */
> > + if (!otg->caps->needs_companion &&
> > + usb_otg_hcd_is_primary_hcd(hcd)) {
> > dev_err(otg_dev, "otg: primary host already
> > registered\n");
> > goto err;
> > }
> >
> > - if (hcd->shared_hcd == otg->primary_hcd.hcd) {
> > + if (otg->caps->needs_companion ||
> > + (hcd->shared_hcd == otg->primary_hcd.hcd)) {
> > if (otg->shared_hcd.hcd) {
> > dev_err(otg_dev, "otg: shared host already
> > registered\n");
> > goto err;
> > @@ -865,7 +867,8 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned
> > int irqnum,
> > * we're ready only if we have shared HCD
> > * or we don't need shared HCD.
> > */
> > - if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
> > + if (otg->shared_hcd.hcd || (!otg->caps->needs_companion &&
> > + !otg->primary_hcd.hcd->shared_hcd)) {
> > otg->host = hcd_to_bus(hcd);
> > /* FIXME: set bus->otg_port if this is true OTG port with HNP */
> >
>
> These changes look good to me. Thanks.
Thank you for the comment.
If we change the "needs_companion" place to the otg_config,
do we need to add a flag into the otg, instead of otg->caps?
> > diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> > index b094352..64a7db8 100644
> > --- a/include/linux/usb/otg.h
> > +++ b/include/linux/usb/otg.h
> > @@ -112,12 +112,14 @@ struct usb_otg {
> > * @hnp_support: Indicates if the device supports HNP.
> > * @srp_support: Indicates if the device supports SRP.
> > * @adp_support: Indicates if the device supports ADP.
> > + * @needs_companion: Indicates if the device needs a companion controller.
>
> Description is not exact. How about this.
> "Indicates if host controller needs a companion controller"
>
> Is hcd_needs_companion is better than just needs_companion?
I agree with you.
So, I will modify my local patch and test it tomorrow.
Best regards,
Yoshihiro Shimoda
>
> > */
> > struct usb_otg_caps {
> > u16 otg_rev;
> > bool hnp_support;
> > bool srp_support;
> > bool adp_support;
> > + bool needs_companion;
> > };
> >
> > /**
> >
>
> cheers,
> -roger
