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Date: Wed, 1 May 2024 09:27:44 +0200
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: Mateusz =?utf-8?Q?Jo=C5=84czyk?= <mat.jonczyk@o2.pl>,
	Heiner Kallweit <hkallweit1@gmail.com>
Cc: Jean Delvare <jdelvare@suse.de>, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, ruirui.yang@linux.dev,
	Wolfram Sang <wsa@kernel.org>
Subject: Re: [Regression] dmesg warnings after "i2c: smbus: Support up to 8
 SPD EEPROMs"
Message-ID: <20240501072744.2xm4v3idjjsehwkq@ninjato>
Mail-Followup-To: Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Mateusz =?utf-8?Q?Jo=C5=84czyk?= <mat.jonczyk@o2.pl>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Jean Delvare <jdelvare@suse.de>, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, ruirui.yang@linux.dev,
	Wolfram Sang <wsa@kernel.org>
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Adding Heiner...

On Tue, Apr 30, 2024 at 09:39:03PM +0200, Mateusz Jo=C5=84czyk wrote:
> Hello,
>=20
> I have received a regression report on
> commit 13e3a512a29001c ("i2c: smbus: Support up to 8 SPD EEPROMs")
> as I was subscribed to some kernel Bugzilla thread and I'm posting it here
> to make you aware of it.
>=20
> This thread was
>=20
> Bug 213345 - i801_smbus: Timeout waiting for interrupt, driver can't acce=
ss SMBus=20
>=20
> ruirui.yang@linux.dev on 2024-04-19 08:22:57 UTC wrote:
> > I got similar issue on thinkpad X1 gen9 with latest 6.9.0-rc4+
> > Git bisect the first bad commit is "13e3a512a29001c  i2c: smbus: Suppor=
t up to 8 SPD EEPROMs
> > "
> >=20
> > modprobe without param:
> > [ 1290.401393] i801_smbus 0000:00:1f.4: SPD Write Disable is set
> > [ 1290.401486] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt
> > [ 1290.403340] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403383] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403410] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403437] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403465] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403492] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403519] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1290.403546] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> >=20
> > with param=20
> > [ 1314.568785] i801_smbus 0000:00:1f.4: Interrupt disabled by user
> > [ 1314.568837] i801_smbus 0000:00:1f.4: SPD Write Disable is set
> > [ 1314.568894] i801_smbus 0000:00:1f.4: SMBus using po*lling
> > [ 1314.570230] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570257] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570283] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570310] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570336] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570362] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570389] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
> > [ 1314.570415] i801_smbus 0000:00:1f.4: SMBus is busy, can't use it!
>=20
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D213345
>=20
> The param mentioned was i2c-i801.disable_features=3D0x10, which disables =
interrupt usage
> of this driver.
>=20
> Please decide if this is serious enough to warrant a revert.
>=20
> Greetings,
> Mateusz
>=20
>=20

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