linux-kernel - RE: [PATCH v2 5/9] usb: roles: Provide the switch drivers handle to the switch in the API

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Date:   Mon, 2 Mar 2020 10:14:11 +0000
From:   Peter Chen <peter.chen@....com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Bin Liu <b-liu@...com>
Subject: RE: [PATCH v2 5/9] usb: roles: Provide the switch drivers handle to
 the switch in the API

 
> 
> On Mon, Mar 02, 2020 at 06:22:59AM +0000, Peter Chen wrote:
> > > > @@ -613,9 +613,10 @@ static enum usb_role ci_usb_role_switch_get(struct
> device *dev)
> > > >  	return role;
> > > >  }
> > > >
> > > > -static int ci_usb_role_switch_set(struct device *dev, enum
> > > > usb_role role)
> > > > +static int ci_usb_role_switch_set(struct usb_role_switch *sw,
> > > > +				  enum usb_role role)
> > > >  {
> > > > -	struct ci_hdrc *ci = dev_get_drvdata(dev);
> > > > +	struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
> > > >  	struct ci_hdrc_cable *cable = NULL;
> > > >  	enum usb_role current_role = ci_role_to_usb_role(ci);
> > > >  	enum ci_role ci_role = usb_role_to_ci_role(role); @@ -1118,6
> > > > +1119,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> > > >  	}
> > > >
> > > >  	if (ci_role_switch.fwnode) {
> > > > +		ci_role_switch.driver_data = ci;
> >
> > And chipidea code, better change it like cdns3's, otherwise, the
> > switch desc for all controllers have the same driver_data.
> 
> That I'll skip after all...
> 
> Note that since the context of the switch descriptor is always copied during
> registration, the driver_data is not going to be the same for every switch.
> 

Yes, there is no problem now, just to avoid the issue if usb switch core will use
each descriptor in future.

> The structure is actually filled in two separate functions, so the change is not
> straightforward. We can still change that of course, but it's out side the scope of this
> series, so it needs to be done separately.
> 
 
Ok, you could leave it like this v2, and I will do it in future.

Peter