On Tue, 16 Jun 2015 17:21:50 +0800
Li Jun <b47624@xxxxxxxxxxxxx> wrote:
> On Tue, Jun 16, 2015 at 11:44:52AM +0300, Roger Quadros wrote:
> >
> > On Tue, 16 Jun 2015 14:51:57 +0800
> > Li Jun <jun.li@xxxxxxxxxxxxx> wrote:
> >
> > > Set gadget's otg features according to controller's capability and usb
> > > property in device tree.
> > >
> > > Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
> > > ---
> > > drivers/usb/chipidea/core.c | 18 ++++++++++++++++++
> > > drivers/usb/chipidea/udc.c | 20 +++++++++++++++++++-
> > > include/linux/usb/chipidea.h | 4 ++++
> > > 3 files changed, 41 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> > > index 74fea4f..45bd44e 100644
> > > --- a/drivers/usb/chipidea/core.c
> > > +++ b/drivers/usb/chipidea/core.c
> > > @@ -588,6 +588,24 @@ static int ci_get_platdata(struct device *dev,
> > > of_usb_host_tpl_support(dev->of_node);
> > > }
> > >
> > > + if (platdata->dr_mode == USB_DR_MODE_OTG) {
> > > + if (!platdata->otg_rev) {
> > > + platdata->otg_rev =
> > > + of_usb_get_otg_rev(dev->of_node);
> > > + }
> > > + if (platdata->otg_rev) {
> > > + if (!platdata->srp_support)
> > > + platdata->srp_support =
> > > + !of_usb_otg_srp_disabled(dev->of_node);
> > > + if (!platdata->hnp_support)
> > > + platdata->hnp_support =
> > > + !of_usb_otg_hnp_disabled(dev->of_node);
> > > + if (!platdata->adp_support)
> > > + platdata->adp_support =
> > > + !of_usb_otg_adp_disabled(dev->of_node);
> > > + }
> > > + }
> > > +
> >
> > Looks like there is some scope of sharing this code among controller drivers
> > and also adding sanity check.
> >
> > How about adding
> >
> > struct usb_otg_caps {
> > u16 otg_rev;
> > bool srp_support;
> > bool hnp_support;
> > bool adp_support;
> > };
> >
> I agree there is some sharing code across all controller drivers,
> thus usb_otg_caps maybe desirable.
>
> > And below API
> >
> > /* sets device otg capabilities based on controller capabilities and device tree flags */
> > void of_usb_otg_set_capabilities(sturct device_node *node, struct usb_otg_caps *cntrl_caps, struct usb_otg_caps *device_caps)
> I think cntrl_caps is not needed, only device_caps of controller is okay;
> If DT is used, then all capabilities are updated by DT, after that,
> controller driver can override some of them if it wants to correct
> some wrong property in DT(not disable some feature the controller
> can not support).
OK.
> > {
> > u16 otg_rev = of_usb_get_otg_rev(dev->of_node);
> >
> > *device_caps = *cntrl_caps;
> > if (!otg_rev) { /* legacy platform */
> > device_caps->adp_support = false;
> > /* For SRP/HNP respect what controller supports */
> > return;
> > }
> >
> > if (otg_rev < cntrl_caps->otg_rev)
> > device_caps->otg_rev = cntrl_caps->otg_rev;
> Not catch your point, if controller can support a higher version
> protocol, even passed a lower setting in DT, we still use higher
> version?
My mistake. Should have been
if (otg_rev < cntrl_caps->otg_rev)
device_caps->org_rev = otg_rev;
> > if (of_usb_otg_srp_disabled(dev->of_node))
> > device_caps->srp_support = false;
> > if (of_usb_otg_hnp_disabled(dev->of_node))
> > device_caps->hnp_support = false;
> > if (of_usb_otg_adp_disabled(dev->of_node))
> > device_caps->adp_support = false;
> >
> > /* sanity check */
> > if ((otg_rev < 0x0200) && device_caps->adp_support) {
> > /* pre otg 2.0 doesn't support ADP */
> > device_caps->adp_support = false;
> > }
> >
> > return;
> > }
cheers,
-roger
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