linux-kernel - Re: [PATCH v1] usb: typec: tcpm: Fix error while calculating PPS out values

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Date:   Wed, 14 Apr 2021 22:07:59 -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>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kyle Tso <kyletso@...gle.com>
Subject: Re: [PATCH v1] usb: typec: tcpm: Fix error while calculating PPS out
 values

On 4/14/21 10:01 PM, Badhri Jagan Sridharan wrote:
> "usb: typec: tcpm: Address incorrect values of tcpm psy for pps supply"
> introduced a regression for req_out_volt and req_op_curr calculation.
> 
> req_out_volt should consider the newly calculated max voltage instead
> of previously accepted max voltage by the port partner. Likewise,
> req_op_curr should consider the newly calculated max current instead
> of previously accepted max current by the port partner.
> 
> Fixes: e3a072022487 ("usb: typec: tcpm: Address incorrect values of tcpm psy for pps supply")
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>

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

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 1c32bdf62852..04652aa1f54e 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3132,10 +3132,10 @@ static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
>  		port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src),
>  						  pdo_pps_apdo_max_voltage(snk));
>  		port->pps_data.req_max_curr = min_pps_apdo_current(src, snk);
> -		port->pps_data.req_out_volt = min(port->pps_data.max_volt,
> -						  max(port->pps_data.min_volt,
> +		port->pps_data.req_out_volt = min(port->pps_data.req_max_volt,
> +						  max(port->pps_data.req_min_volt,
>  						      port->pps_data.req_out_volt));
> -		port->pps_data.req_op_curr = min(port->pps_data.max_curr,
> +		port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
>  						 port->pps_data.req_op_curr);
>  	}
>  
>