netdev - Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support for temperature sensor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240201161435.GA48964@debian>
Date: Thu, 1 Feb 2024 17:14:35 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jean Delvare <jdelvare@...e.com>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support
 for temperature sensor

Am Thu, Feb 01, 2024 at 05:34:05AM -0800 schrieb Guenter Roeck:
> On 1/31/24 23:11, Dimitri Fedrau wrote:
> > Am Wed, Jan 31, 2024 at 04:17:06PM +0100 schrieb Andrew Lunn:
> > > > +static int mv88q2xxx_hwmon_probe(struct phy_device *phydev)
> > > > +{
> > > > +	struct device *dev = &phydev->mdio.dev;
> > > > +	struct device *hwmon;
> > > > +	char *hwmon_name;
> > > > +	int ret;
> > > > +
> > > > +	/* Enable temperature sensor interrupt */
> > > > +	ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS,
> > > > +			       MDIO_MMD_PCS_MV_TEMP_SENSOR1,
> > > > +			       MDIO_MMD_PCS_MV_TEMP_SENSOR1_INT_EN);
> > > 
> > > You enable an interrupt, but i don't see any changes to the interrupt
> > > handler to handle any interrupts which are generated?
> > > 
> > Hi Andrew,
> > 
> > you are right. Have to remove these lines. Besides enabling the interrupt
> > in MDIO_MMD_PCS_MV_TEMP_SENSOR1, there are two further register writes
> > necessary to make the interrupt propagate. I didn't want it to propagate.
> > Anyway it's wrong. I couldn't find a good solution to use the temperature
> > interrupt. Will have a look into this, and probably figuring out how to
> > do so. But it won't be part of this patch series.
> > 
> 
> From hwmon perspective, the expected use of such an interrupt would be
> to call hwmon_notify_event() with the affected limit attribute as argument.
> This would notify the thermal subsystem if the sensor is registered with it
> (your patch doesn't set the necessary flag when registering the driver,
> so this would not happen), it will send a notification to the sysfs
> attribute, and generate a udev event.
>
Thanks, noted it down. Didn't know about the notification to the thermal
subsystem and the generated udev event. :)

Dimitri