linux-kernel - Re: usb: typec: tcpm: add get max power support

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Date:   Fri, 16 Jun 2023 11:13:08 +0800
From:   Frank Wang <frank.wang@...k-chips.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org,
        sebastian.reichel@...labora.com, heiko@...ech.de
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, huangtao@...k-chips.com,
        william.wu@...k-chips.com, jianwei.zheng@...k-chips.com,
        yubing.zhang@...k-chips.com, wmc@...k-chips.com
Subject: Re: usb: typec: tcpm: add get max power support

Hi Guenter,

On 2023/6/16 10:26, Guenter Roeck wrote:
> On 6/15/23 19:21, Frank Wang wrote:
>> Traverse fixed pdos to calculate the maximum power that the charger
>> can provide, and it can be got by POWER_SUPPLY_PROP_INPUT_POWER_LIMIT
>> property.
>>
>
> Wasn't this already v3 before ? What happened to the version, and the 
> change log ?
> Or is this a completely different/new patch ?
>

Yes, it is the v3 patch before which has been hold for a long time, 
Gregkh asked me to rebase it  and resubmit, so should I also add an 
"RESEND" tag in subject?


BR.
Frank


> Guenter
>
>> Signed-off-by: Frank Wang <frank.wang@...k-chips.com>
>> ---
>>   drivers/usb/typec/tcpm/tcpm.c | 24 ++++++++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>
>> diff --git a/drivers/usb/typec/tcpm/tcpm.c 
>> b/drivers/usb/typec/tcpm/tcpm.c
>> index 9f6aaa3e70ca8..829d75ebab422 100644
>> --- a/drivers/usb/typec/tcpm/tcpm.c
>> +++ b/drivers/usb/typec/tcpm/tcpm.c
>> @@ -6340,6 +6340,27 @@ static int tcpm_psy_get_current_now(struct 
>> tcpm_port *port,
>>       return 0;
>>   }
>>   +static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
>> +                      union power_supply_propval *val)
>> +{
>> +    unsigned int src_mv, src_ma, max_src_uw = 0;
>> +    unsigned int i, tmp;
>> +
>> +    for (i = 0; i < port->nr_source_caps; i++) {
>> +        u32 pdo = port->source_caps[i];
>> +
>> +        if (pdo_type(pdo) == PDO_TYPE_FIXED) {
>> +            src_mv = pdo_fixed_voltage(pdo);
>> +            src_ma = pdo_max_current(pdo);
>> +            tmp = src_mv * src_ma;
>> +            max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
>> +        }
>> +    }
>> +
>> +    val->intval = max_src_uw;
>> +    return 0;
>> +}
>> +
>>   static int tcpm_psy_get_prop(struct power_supply *psy,
>>                    enum power_supply_property psp,
>>                    union power_supply_propval *val)
>> @@ -6369,6 +6390,9 @@ static int tcpm_psy_get_prop(struct 
>> power_supply *psy,
>>       case POWER_SUPPLY_PROP_CURRENT_NOW:
>>           ret = tcpm_psy_get_current_now(port, val);
>>           break;
>> +    case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
>> +        tcpm_psy_get_input_power_limit(port, val);
>> +        break;
>>       default:
>>           ret = -EINVAL;
>>           break;
>