linux-kernel - Re: [PATCH v1 1/2] usb: typec: tcpm: add tcpm_port_error

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Message-ID: <ZWWdYg+Iu4vJjS3/@kuha.fi.intel.com>
Date:   Tue, 28 Nov 2023 09:57:22 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     RD Babiera <rdbabiera@...gle.com>
Cc:     linux@...ck-us.net, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        badhri@...gle.com
Subject: Re: [PATCH v1 1/2] usb: typec: tcpm: add tcpm_port_error_recovery
 symbol

On Tue, Nov 21, 2023 at 08:38:47PM +0000, RD Babiera wrote:
> Add tcpm_port_error_recovery symbol and corresponding event that runs in
> tcpm_pd_event handler to set the port to the ERROR_RECOVERY state. tcpci
> drivers can use the symbol to reset the port when tcpc faults affect port
> functionality.
> 
> Signed-off-by: RD Babiera <rdbabiera@...gle.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 14 ++++++++++++++
>  include/linux/usb/tcpm.h      |  1 +
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 058d5b853b57..2e553dc63619 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -251,6 +251,7 @@ enum frs_typec_current {
>  #define TCPM_FRS_EVENT		BIT(3)
>  #define TCPM_SOURCING_VBUS	BIT(4)
>  #define TCPM_PORT_CLEAN		BIT(5)
> +#define TCPM_PORT_ERROR		BIT(6)
>  
>  #define LOG_BUFFER_ENTRIES	1024
>  #define LOG_BUFFER_ENTRY_SIZE	128
> @@ -5477,6 +5478,10 @@ static void tcpm_pd_event_handler(struct kthread_work *work)
>  					tcpm_set_state(port, tcpm_default_state(port), 0);
>  			}
>  		}
> +		if (events & TCPM_PORT_ERROR) {
> +			tcpm_log(port, "port triggering error recovery");
> +			tcpm_set_state(port, ERROR_RECOVERY, 0);
> +		}
>  
>  		spin_lock(&port->pd_event_lock);
>  	}
> @@ -5544,6 +5549,15 @@ bool tcpm_port_is_toggling(struct tcpm_port *port)
>  }
>  EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
>  
> +void tcpm_port_error_recovery(struct tcpm_port *port)
> +{
> +	spin_lock(&port->pd_event_lock);
> +	port->pd_events |= TCPM_PORT_ERROR;
> +	spin_unlock(&port->pd_event_lock);
> +	kthread_queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_port_error_recovery);
> +
>  static void tcpm_enable_frs_work(struct kthread_work *work)
>  {
>  	struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index ab7ca872950b..65fac5e1f317 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -173,5 +173,6 @@ void tcpm_pd_hard_reset(struct tcpm_port *port);
>  void tcpm_tcpc_reset(struct tcpm_port *port);
>  void tcpm_port_clean(struct tcpm_port *port);
>  bool tcpm_port_is_toggling(struct tcpm_port *port);
> +void tcpm_port_error_recovery(struct tcpm_port *port);
>  
>  #endif /* __LINUX_USB_TCPM_H */
> -- 
> 2.43.0.rc1.413.gea7ed67945-goog

-- 
heikki