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Date: Tue, 14 Apr 2020 16:08:32 +0200 From: Enric Balletbo i Serra <enric.balletbo@...labora.com> To: Prashant Malani <pmalani@...omium.org>, linux-kernel@...r.kernel.org Cc: heikki.krogerus@...ux.intel.com, Jon Flatley <jflat@...omium.org>, Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org> Subject: Re: [PATCH v3 3/3] platform/chrome: typec: Register port partner Hi Prashant, Thank you for your patch. On 10/4/20 2:23, Prashant Malani wrote: > Register (and unregister) the port partner when a connect (and > disconnect) is detected. > > Co-developed-by: Jon Flatley <jflat@...omium.org> > Signed-off-by: Prashant Malani <pmalani@...omium.org> > --- > > Changes in v3: > - No changes. > > Changes in v2: > - Fixed error pointer return value. > > drivers/platform/chrome/cros_ec_typec.c | 48 +++++++++++++++++++++++++ > 1 file changed, 48 insertions(+) > > diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c > index 56ded09a60ffb..304e0b20f279b 100644 > --- a/drivers/platform/chrome/cros_ec_typec.c > +++ b/drivers/platform/chrome/cros_ec_typec.c > @@ -22,6 +22,9 @@ struct cros_typec_port { > struct typec_port *port; > /* Initial capabilities for the port. */ > struct typec_capability caps; > + struct typec_partner *partner; > + /* Port partner PD identity info. */ > + struct usb_pd_identity p_identity; > }; > > /* Platform-specific data for the Chrome OS EC Type C controller. */ > @@ -190,6 +193,30 @@ static int cros_typec_ec_command(struct cros_typec_data *typec, > return ret; > } > > +static int cros_typec_add_partner(struct cros_typec_data *typec, int port_num, > + bool pd_en) > +{ > + struct cros_typec_port *port = typec->ports[port_num]; > + struct typec_partner_desc p_desc = { > + .usb_pd = pd_en, > + }; > + int ret = 0; > + > + /* > + * Fill an initial PD identity, which will then be updated with info > + * from the EC. > + */ > + p_desc.identity = &port->p_identity; > + > + port->partner = typec_register_partner(port->port, &p_desc); > + if (IS_ERR_OR_NULL(port->partner)) { > + ret = PTR_ERR(port->partner); If you're checking for IS_ERR_OR_NULL that means that port->partner can be NULL, so PTR_ERR(NULL) is 0 returning something that you don't really want. But looking at the typec_register_partner, NULL is not an option as returns a handle to the partner on success or ERR_PTR on failure. So, the code should just do: if (IS_ERR(port->partner)) return PTR_ERR(port->partner); And AFAICS you don't need to set port->partner to NULL. Can you double check this? Thanks, Enric > + port->partner = NULL; > + } > + > + return ret; > +} > + > static void cros_typec_set_port_params_v0(struct cros_typec_data *typec, > int port_num, struct ec_response_usb_pd_control *resp) > { > @@ -212,6 +239,8 @@ static void cros_typec_set_port_params_v1(struct cros_typec_data *typec, > { > struct typec_port *port = typec->ports[port_num]->port; > enum typec_orientation polarity; > + bool pd_en; > + int ret; > > if (!(resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED)) > polarity = TYPEC_ORIENTATION_NONE; > @@ -226,6 +255,25 @@ static void cros_typec_set_port_params_v1(struct cros_typec_data *typec, > TYPEC_SOURCE : TYPEC_SINK); > typec_set_vconn_role(port, resp->role & PD_CTRL_RESP_ROLE_VCONN ? > TYPEC_SOURCE : TYPEC_SINK); > + > + /* Register/remove partners when a connect/disconnect occurs. */ > + if (resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED) { > + if (typec->ports[port_num]->partner) > + return; > + > + pd_en = resp->enabled & PD_CTRL_RESP_ENABLED_PD_CAPABLE; > + ret = cros_typec_add_partner(typec, port_num, pd_en); > + if (!ret) > + dev_warn(typec->dev, > + "Failed to register partner on port: %d\n", > + port_num); > + } else { > + if (!typec->ports[port_num]->partner) > + return; > + > + typec_unregister_partner(typec->ports[port_num]->partner); > + typec->ports[port_num]->partner = NULL; > + } > } > > static int cros_typec_port_update(struct cros_typec_data *typec, int port_num) >
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