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Subject: Re: [PATCH 1/2] usb: typec: tcpm: Support bist test data mode for
 compliance
To:     Badhri Jagan Sridharan <badhri@google.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        reg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20200713203838.339297-1-badhri@google.com>
From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <ee68dcb9-8335-81f3-fe9f-2d0cf55f4693@roeck-us.net>
Date:   Tue, 14 Jul 2020 07:09:38 -0700
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On 7/13/20 1:38 PM, Badhri Jagan Sridharan wrote:
> TCPM supports BIST carried mode. PD compliance tests require
> BIST Test Data to be supported as well.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

This should be two patches: One to introduce support for
BDO_MODE_TESTDATA into tcpm, and one to enable it in the tcpci
code.

> ---
>  drivers/usb/typec/tcpm/tcpci.c | 14 ++++++++++++++
>  drivers/usb/typec/tcpm/tcpci.h |  3 +++
>  drivers/usb/typec/tcpm/tcpm.c  |  7 +++++++
>  include/linux/usb/tcpm.h       |  2 ++
>  4 files changed, 26 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index 753645bb25273a..3616263f661233 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -227,6 +227,19 @@ static int tcpci_set_vconn(struct tcpc_dev *tcpc, bool enable)
>  				enable ? TCPC_POWER_CTRL_VCONN_ENABLE : 0);
>  }
>  
> +static int tcpci_set_bist_data(struct tcpc_dev *tcpc, bool enable)
> +{
> +	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
> +	int ret;
> +
> +	dev_info(tcpci->dev, "set bist %s\n", enable ? "true" : "false");

This should be a tcpm log message in the calling code, and not go to the kernel log.

> +	ret = regmap_update_bits(tcpci->regmap, TCPC_TCPC_CTRL,
> +				 TCPC_TCPC_CTRL_BIST_TM, enable ?
> +				 TCPC_TCPC_CTRL_BIST_TM : 0);

Formatting is a bit off here. First, the limit is now 100 columns, and
"enable ? ..." should be in one line.

> +
> +	return ret;

Just
	return regmap_update_bits(...);

> +}
> +
>  static int tcpci_set_roles(struct tcpc_dev *tcpc, bool attached,
>  			   enum typec_role role, enum typec_data_role data)
>  {
> @@ -530,6 +543,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
>  	tcpci->tcpc.set_pd_rx = tcpci_set_pd_rx;
>  	tcpci->tcpc.set_roles = tcpci_set_roles;
>  	tcpci->tcpc.pd_transmit = tcpci_pd_transmit;
> +	tcpci->tcpc.set_bist_data = tcpci_set_bist_data;
>  
>  	err = tcpci_parse_config(tcpci);
>  	if (err < 0)
> diff --git a/drivers/usb/typec/tcpm/tcpci.h b/drivers/usb/typec/tcpm/tcpci.h
> index 303ebde265465c..a29c8b6c2efe07 100644
> --- a/drivers/usb/typec/tcpm/tcpci.h
> +++ b/drivers/usb/typec/tcpm/tcpci.h
> @@ -36,6 +36,7 @@
>  
>  #define TCPC_TCPC_CTRL			0x19
>  #define TCPC_TCPC_CTRL_ORIENTATION	BIT(0)
> +#define TCPC_TCPC_CTRL_BIST_TM		BIT(1)
>  
>  #define TCPC_ROLE_CTRL			0x1a
>  #define TCPC_ROLE_CTRL_DRP		BIT(6)
> @@ -130,6 +131,8 @@ struct tcpci_data {
>  			 bool enable);
>  	int (*start_drp_toggling)(struct tcpci *tcpci, struct tcpci_data *data,
>  				  enum typec_cc_status cc);
> +	int (*set_bist_data)(struct tcpci *tcpci, struct tcpci_data *data,
> +			     bool enable);
>  };
>  
>  struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data);
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 82b19ebd7838e0..525379798d6c5c 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2746,6 +2746,9 @@ static void tcpm_detach(struct tcpm_port *port)
>  	if (!port->attached)
>  		return;
>  
> +	if (port->tcpc->set_bist_data)
> +		port->tcpc->set_bist_data(port->tcpc, false);
> +
>  	if (tcpm_port_is_disconnected(port))
>  		port->hard_reset_count = 0;
>  
> @@ -3555,6 +3558,10 @@ 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)
> +				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;
>