linux-kernel - Re: [PATCH net-next v1] net: phy: nxp-tja11xx: log critical health state

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Date:   Tue, 10 Aug 2021 11:18:05 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andrew Lunn <andrew@...n.ch>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Marek Vasut <marex@...x.de>, David Jander <david@...tonic.nl>,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH net-next v1] net: phy: nxp-tja11xx: log critical health
 state

On 8/10/21 8:05 AM, Andrew Lunn wrote:
> Hi Oleksij
> 
>> @@ -89,6 +91,12 @@ static struct tja11xx_phy_stats tja11xx_hw_stats[] = {
>>   	{ "phy_polarity_detect", 25, 6, BIT(6) },
>>   	{ "phy_open_detect", 25, 7, BIT(7) },
>>   	{ "phy_short_detect", 25, 8, BIT(8) },
>> +	{ "phy_temp_warn (temp > 155C°)", 25, 9, BIT(9) },
>> +	{ "phy_temp_high (temp > 180C°)", 25, 10, BIT(10) },
>> +	{ "phy_uv_vddio", 25, 11, BIT(11) },
>> +	{ "phy_uv_vddd_1v8", 25, 13, BIT(13) },
>> +	{ "phy_uv_vdda_3v3", 25, 14, BIT(14) },
>> +	{ "phy_uv_vddd_3v3", 25, 15, BIT(15) },
>>   	{ "phy_rem_rcvr_count", 26, 0, GENMASK(7, 0) },
>>   	{ "phy_loc_rcvr_count", 26, 8, GENMASK(15, 8) },
> 
> I'm not so happy abusing the statistic counters like this. Especially
> when we have a better API for temperature and voltage: hwmon.
> 
> phy_temp_warn maps to hwmon_temp_max_alarm. phy_temp_high maps to
> either hwmon_temp_crit_alarm or hwmon_temp_emergency_alarm.
> 
> The under voltage maps to hwmon_in_lcrit_alarm.
> 

FWIW, the statistics counters in this driver are already abused
(phy_polarity_detect, phy_open_detect, phy_short_detect), so
I am not sure if adding more abuse makes a difference (and/or
if such abuse is common for phy drivers in general).

Guenter

>> @@ -630,6 +640,11 @@ static irqreturn_t tja11xx_handle_interrupt(struct phy_device *phydev)
>>   		return IRQ_NONE;
>>   	}
>>   
>> +	if (irq_status & MII_INTSRC_TEMP_ERR)
>> +		dev_err(dev, "Overtemperature error detected (temp > 155C°).\n");
>> +	if (irq_status & MII_INTSRC_UV_ERR)
>> +		dev_err(dev, "Undervoltage error detected.\n");
>> +
> 
> These are not actual errors, in the linux sense. So dev_warn() or
> maybe dev_info().
> 
>        Andrew
>