linux-kernel - Re: [PATCH v2 1/3] usb: typec: tcpm: Add Callback to Usb Communication capable partner

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Date:   Mon, 1 Feb 2021 20:34:47 -0800
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kyle Tso <kyletso@...gle.com>
Cc:     USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] usb: typec: tcpm: Add Callback to Usb
 Communication capable partner

Hi Guenter,

Sent V2 version of the patch stack:
https://patchwork.kernel.org/project/linux-usb/list/?series=425705.
For me, Gmail is grouping this under v1 version for some reason and
since you had reviewed one other patch
which was sent later, I was wondering if you are having similar
grouping issue as well.
I am pinging here to make sure that the patch isn't missed.

Thanks,
Badhri

On Mon, Feb 1, 2021 at 4:31 PM Badhri Jagan Sridharan <badhri@...gle.com> wrote:
>
> The USB Communications Capable bit indicates if port
> partner is capable of communication over the USB data lines
> (e.g. D+/- or SS Tx/Rx). Notify the status of the bit to low
> level drivers to perform chip specific operation.
> For instance, low level driver enables USB switches on D+/D-
> lines to set up data path when the bit is set.
>
> Refactored from patch initially authored by
> Kyle Tso <kyletso@...gle.com>
>
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> ---
> Changes since V1:
> - Removed partner_usb_comm_capable flag.
> - Fixed capable flag for SNK_NEGOTIATE_CAPABILITIES.
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 13 +++++++++++++
>  include/linux/usb/tcpm.h      |  5 +++++
>  2 files changed, 18 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 0afd8ef692e8..997a1a56c161 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3429,6 +3429,14 @@ static void tcpm_unregister_altmodes(struct tcpm_port *port)
>         memset(modep, 0, sizeof(*modep));
>  }
>
> +static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
> +{
> +       tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
> +
> +       if (port->tcpc->set_partner_usb_comm_capable)
> +               port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
> +}
> +
>  static void tcpm_reset_port(struct tcpm_port *port)
>  {
>         int ret;
> @@ -3445,6 +3453,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
>         port->attached = false;
>         port->pd_capable = false;
>         port->pps_data.supported = false;
> +       tcpm_set_partner_usb_comm_capable(port, false);
>
>         /*
>          * First Rx ID should be 0; set this to a sentinel of -1 so that
> @@ -3785,6 +3794,8 @@ static void run_state_machine(struct tcpm_port *port)
>                         }
>                 } else {
>                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +                       tcpm_set_partner_usb_comm_capable(port,
> +                                                         !!(port->sink_request & RDO_USB_COMM));
>                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
>                                        PD_T_SRC_TRANSITION);
>                 }
> @@ -4004,6 +4015,8 @@ static void run_state_machine(struct tcpm_port *port)
>                 break;
>         case SNK_NEGOTIATE_CAPABILITIES:
>                 port->pd_capable = true;
> +               tcpm_set_partner_usb_comm_capable(port,
> +                                                 !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
>                 port->hard_reset_count = 0;
>                 ret = tcpm_pd_send_request(port);
>                 if (ret < 0) {
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index 3af99f85e8b9..42fcfbe10590 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -108,6 +108,10 @@ enum tcpm_transmit_type {
>   *             is supported by TCPC, set this callback for TCPM to query
>   *             whether vbus is at VSAFE0V when needed.
>   *             Returns true when vbus is at VSAFE0V, false otherwise.
> + * @set_partner_usb_comm_capable:
> + *              Optional; The USB Communications Capable bit indicates if port
> + *              partner is capable of communication over the USB data lines
> + *              (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit.
>   */
>  struct tcpc_dev {
>         struct fwnode_handle *fwnode;
> @@ -139,6 +143,7 @@ struct tcpc_dev {
>         int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode,
>                                                  bool pps_active, u32 requested_vbus_voltage);
>         bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
> +       void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);
>  };
>
>  struct tcpm_port;
> --
> 2.30.0.365.g02bc693789-goog
>