linux-kernel - Re: [PATCH v2 3/6] usb: typec: tcpm: update power supply once partner accepts

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Date:   Fri, 9 Apr 2021 19:10:28 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Badhri Jagan Sridharan <badhri@...gle.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Kyle Tso <kyletso@...gle.com>
Subject: Re: [PATCH v2 3/6] usb: typec: tcpm: update power supply once partner
 accepts

On 4/7/21 1:07 PM, Badhri Jagan Sridharan wrote:
> power_supply_changed needs to be called to notify clients
> after the partner accepts the requested values for the pps
> case.
> 
> Also, remove the redundant power_supply_changed at the end
> of the tcpm_reset_port as power_supply_changed is already
> called right after usb_type is changed.
> 
> Fixes: f2a8aa053c176 ("typec: tcpm: Represent source supply through power_supply")
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>

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

> ---
> Changes since V1:
> * Updated commit description to clarify Guenter Roeck's concern.
> * Added Reviewed-by tags
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index b4a40099d7e9..d1d03ee90d8f 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2568,6 +2568,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
>  			port->pps_data.max_curr = port->pps_data.req_max_curr;
>  			port->req_supply_voltage = port->pps_data.req_out_volt;
>  			port->req_current_limit = port->pps_data.req_op_curr;
> +			power_supply_changed(port->psy);
>  			tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
>  			break;
>  		case SOFT_RESET_SEND:
> @@ -3136,7 +3137,6 @@ static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
>  						      port->pps_data.req_out_volt));
>  		port->pps_data.req_op_curr = min(port->pps_data.max_curr,
>  						 port->pps_data.req_op_curr);
> -		power_supply_changed(port->psy);
>  	}
>  
>  	return src_pdo;
> @@ -3561,8 +3561,6 @@ static void tcpm_reset_port(struct tcpm_port *port)
>  	port->sink_cap_done = false;
>  	if (port->tcpc->enable_frs)
>  		port->tcpc->enable_frs(port->tcpc, false);
> -
> -	power_supply_changed(port->psy);
>  }
>  
>  static void tcpm_detach(struct tcpm_port *port)
>