linux-kernel - Re: [PATCH 2/9] usb: typec: Add retimer handle to port

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Message-ID: <CACeCKadQr4m_OK92GmVefJDS4d-3+E2WkW=YzVnoYkbmXzwESw@mail.gmail.com>
Date:   Thu, 30 Jun 2022 10:16:00 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        chrome-platform@...ts.linux.dev, bleung@...omium.org,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH 2/9] usb: typec: Add retimer handle to port

HI Heikki,

On Thu, Jun 30, 2022 at 1:27 AM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> Hi,
>
> On Wed, Jun 29, 2022 at 11:32:20PM +0000, Prashant Malani wrote:
> > Similar to mux and orientation switch, add a handle for registered
> > retimer to the port, so that it has handles to the various switches
> > connected to it.
> >
> > Signed-off-by: Prashant Malani <pmalani@...omium.org>
> > ---
> >  drivers/usb/typec/class.c | 8 ++++++++
> >  drivers/usb/typec/class.h | 1 +
> >  2 files changed, 9 insertions(+)
> >
> > diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> > index 2fa0b3718d23..2bc5fbdb25dd 100644
> > --- a/drivers/usb/typec/class.c
> > +++ b/drivers/usb/typec/class.c
> > @@ -12,6 +12,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/usb/pd_vdo.h>
> >  #include <linux/usb/typec_mux.h>
> > +#include <linux/usb/typec_retimer.h>
> >
> >  #include "bus.h"
> >  #include "class.h"
> > @@ -2249,6 +2250,13 @@ struct typec_port *typec_register_port(struct device *parent,
> >               return ERR_PTR(ret);
> >       }
> >
> > +     port->retimer = typec_retimer_get(&port->dev);
> > +     if (IS_ERR(port->retimer)) {
> > +             ret = PTR_ERR(port->retimer);
> > +             put_device(&port->dev);
> > +             return ERR_PTR(ret);
> > +     }
> > +
> >       ret = device_add(&port->dev);
> >       if (ret) {
> >               dev_err(parent, "failed to register port (%d)\n", ret);
>
> I think you need to release the reference with typec_retimer_put() in
> typec_release().

I knew I was forgetting something...
I'll fix this in v2.

>
> I guess we can look handle this later, but there can actually be two
> onboard retimers for each connector.

You're referring to the cascaded case right? OK, I'll bear this in mind for
later series (right now the EC exposes just 1 interface for retimer).

Thanks,

-Prashant