linux-kernel - Re: [PATCH 2/3 v2] usb: typec: tcpm: Support bist test data mode for compliance

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Date:   Wed, 15 Jul 2020 09:25:04 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Badhri Jagan Sridharan <badhri@...gle.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        reg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3 v2] usb: typec: tcpm: Support bist test data mode for
 compliance

On 7/14/20 4:12 PM, Badhri Jagan Sridharan wrote:
> TCPM supports BIST carried mode. PD compliance tests require
> BIST Test Data to be supported as well.
> 
> Introducing set_bist_data callback to signal tcpc driver for
> configuring the port controller hardware to enable/disable
> BIST Test Data mode.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>

This needs to be the first patch in the series. For the code itself:

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> Version history:
> Changes since V1:(Guenter's suggestions)
> - Split the change into two: TCPM and TCPCI
> - Move BIST log to TCPM log
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 11 +++++++++++
>  include/linux/usb/tcpm.h      |  2 ++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 82b19ebd7838e0..379fcab9dbd973 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2746,6 +2746,11 @@ static void tcpm_detach(struct tcpm_port *port)
>  	if (!port->attached)
>  		return;
>  
> +	if (port->tcpc->set_bist_data) {
> +		tcpm_log(port, "disable BIST MODE TESTDATA");
> +		port->tcpc->set_bist_data(port->tcpc, false);
> +	}
> +
>  	if (tcpm_port_is_disconnected(port))
>  		port->hard_reset_count = 0;
>  
> @@ -3555,6 +3560,12 @@ static void run_state_machine(struct tcpm_port *port)
>  		case BDO_MODE_CARRIER2:
>  			tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
>  			break;
> +		case BDO_MODE_TESTDATA:
> +			if (port->tcpc->set_bist_data) {
> +				tcpm_log(port, "Enable BIST MODE TESTDATA");
> +				port->tcpc->set_bist_data(port->tcpc, true);
> +			}
> +			break;
>  		default:
>  			break;
>  		}
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index e7979c01c3517c..89f58760cf4800 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -79,6 +79,7 @@ enum tcpm_transmit_type {
>   * @try_role:	Optional; called to set a preferred role
>   * @pd_transmit:Called to transmit PD message
>   * @mux:	Pointer to multiplexer data
> + * @set_bist_data: Turn on/off bist data mode for compliance testing
>   */
>  struct tcpc_dev {
>  	struct fwnode_handle *fwnode;
> @@ -103,6 +104,7 @@ struct tcpc_dev {
>  	int (*try_role)(struct tcpc_dev *dev, int role);
>  	int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
>  			   const struct pd_message *msg);
> +	int (*set_bist_data)(struct tcpc_dev *dev, bool on);
>  };
>  
>  struct tcpm_port;
>