linux-kernel - Re: [PATCH -next 1/2] i2c: designware: Switch from using MMIO access to SMN access

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: <YyxrdpUyc+kp48kX@zn.tnic>
Date:   Thu, 22 Sep 2022 16:04:38 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Limonciello, Mario" <mario.limonciello@....com>,
        Jan Dąbroś <jsd@...ihalf.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        jarkko.nikula@...ux.intel.com, wsa@...nel.org,
        rrangel@...omium.org, upstream@...ihalf.com,
        Muralidhara M K <muralimk@....com>,
        Naveen Krishna Chatradhi <nchatrad@....com>
Subject: Re: [PATCH -next 1/2] i2c: designware: Switch from using MMIO access
 to SMN access

On Thu, Sep 22, 2022 at 03:48:07PM +0200, Hans de Goede wrote:
> Right, thank you for Cc-ing me. At least on X86 there are several platforms
> (and 100-s of device models) which use a PMIC connected to the i2c-designware
> controller and this PMIC gets poked directly from ACPI _S0 and _S3
> (power on/off) methods. So the I2C bus driver needs to *bind* to the controller
> as soon as we find its description in ACPI, otherwise we get a whole bunch
> of failed ACPI OpRegion access errors as well as various actual really issues.

Thanks for explaining - I couldn't find the reason why it has to be a
subsys_initcall.

> So please keep this as a subsys initcall.

Which means, init_amd_nbs() would have to be sorted to run before
dw_i2c_init_driver()...

-- 
Regards/Gruss,
    Boris.

SUSE Software Solutions Germany GmbH
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Martje Boudien Moerman
(HRB 36809, AG Nürnberg)