linux-kernel - Re: [PATCH v3 1/4] hwmon: (pmbus/core): Add status byte to regulator flag map

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Date:   Wed, 30 Nov 2022 23:55:34 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>
Subject: Re: [PATCH v3 1/4] hwmon: (pmbus/core): Add status byte to regulator
 flag map

Hi,

On 30-11-2022 11:49 pm, Guenter Roeck wrote:
> On Wed, Nov 30, 2022 at 11:42:32PM +0530, Naresh Solanki wrote:
>> Hi,
>>
>> On 30-11-2022 11:36 pm, Guenter Roeck wrote:
>>> On Wed, Nov 30, 2022 at 05:58:28PM +0100, Naresh Solanki wrote:
>>>> Add PMBus status byte to regulator flag map.
>>>>
>>>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>>>>
>>>> ---
>>>> Changes:
>>>> - Remove status input
>>>
>>> Not really.
>>>
>> This was about PMBUS_STATUS_INPUT & not STATUS_BYTE
>>>> - Add comment for PMBUS status byte.
>>>> ---
>>>>    drivers/hwmon/pmbus/pmbus_core.c | 20 +++++++++++---------
>>>>    1 file changed, 11 insertions(+), 9 deletions(-)
>>>>
>>>> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
>>>> index 95e95783972a..a7b4ae0f1f3b 100644
>>>> --- a/drivers/hwmon/pmbus/pmbus_core.c
>>>> +++ b/drivers/hwmon/pmbus/pmbus_core.c
>>>> @@ -2751,7 +2751,16 @@ struct pmbus_regulator_status_category {
>>>>    };
>>>>    static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] = {
>>>> -	{
>>>> +	{	/* STATUS byte is always present. */
>>>> +		.func = -1,
>>>> +		.reg = PMBUS_STATUS_BYTE,
>>>> +		.bits = (const struct pmbus_regulator_status_assoc[]) {
>>>> +			{ PB_STATUS_IOUT_OC,   REGULATOR_ERROR_OVER_CURRENT },
>>>> +			{ PB_STATUS_VOUT_OV,   REGULATOR_ERROR_REGULATION_OUT },
>>>> +			{ PB_STATUS_VIN_UV,    REGULATOR_ERROR_UNDER_VOLTAGE },
>>>
>>> Still there.
>>>
>> STATUS_INPUT remove & STATUS_BYTE retained.
> 
> You added a check for PB_STATUS_VIN_UV which reports an input failure
> which was not reported before. You do so silently without mentioning the
> change in the description. In the change log you claim "Remove status input".
> Yet, the above adds reporting on an input voltage error. Maybe the
> change log was supposed to refer to the input status register, but that
> doesn't mean you can silently add a check for PB_STATUS_VIN_UV.
Right. I removed STATUS_INPUT but overlooked VIN in STATUS_BYTE.
Will fix this in next revision.
> 
> Guenter
> 
>>>> +			{ },
>>>> +		},
>>>> +	}, {
>>>>    		.func = PMBUS_HAVE_STATUS_VOUT,
>>>>    		.reg = PMBUS_STATUS_VOUT,
>>>>    		.bits = (const struct pmbus_regulator_status_assoc[]) {
>>>> @@ -2768,6 +2777,7 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
>>>>    			{ PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
>>>>    			{ PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
>>>>    			{ PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
>>>> +			{ PB_POUT_OP_FAULT,      REGULATOR_ERROR_FAIL },
>>>
>>> Please document your changes in the description. There are two functional
>>> changes hidden under "Add PMBus status byte to regulator flag map".
>>> That is inappropriate. Those, as I have pointed out, should be separate
>>> patches.
>> My bad. I kept this change in this patch. Will remove this from this patch.
>>>
>>> Guenter
>>>
>>>>    			{ },
>>>>    		},
>>>>    	}, {
>>>> @@ -2834,14 +2844,6 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>>>>    		if (status & PB_STATUS_POWER_GOOD_N)
>>>>    			*flags |= REGULATOR_ERROR_REGULATION_OUT;
>>>>    	}
>>>> -	/*
>>>> -	 * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
>>>> -	 * defined strictly as fault indicators (not warnings).
>>>> -	 */
>>>> -	if (status & PB_STATUS_IOUT_OC)
>>>> -		*flags |= REGULATOR_ERROR_OVER_CURRENT;
>>>> -	if (status & PB_STATUS_VOUT_OV)
>>>> -		*flags |= REGULATOR_ERROR_REGULATION_OUT;
>>>>    	/*
>>>>    	 * If we haven't discovered any thermal faults or warnings via
>>>>
>>>> base-commit: 9494c53e1389b120ba461899207ac8a3aab2632c
>>>> -- 
>>>> 2.37.3
>>>>
>>
>> Regards,
>> Naresh
Regards,
Naresh