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

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Message-ID: <CAOtMz3PG4nku-O7dh+1U_DA05HAmQboTqwUQkCkrXQLV9bFjPw@mail.gmail.com>
Date:   Mon, 16 Jan 2023 11:19:00 +0100
From:   Jan Dąbroś <jsd@...ihalf.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Limonciello, Mario" <mario.limonciello@....com>,
        Borislav Petkov <bp@...e.de>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.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>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH -next 1/2] i2c: designware: Switch from using MMIO access
 to SMN access

Hi Borislav,

> Make init_amd_nbs() arch_initcall_sync() so that it executes after PCI init.

I described earlier in this thread why such option is not working -
let me quote myself:

It's not enough for running init_amd_nbs() to have only
pci_arch_init() done. We need the pci bus to be created and registered
with all devices found on the bus. We are traversing through them and
trying to find northbridge VID/DID. Due to the above, we need to run
init_amd_nbs() only after acpi_scan_init() that is invoked from
acpi_init() which is registered as subsys_initcall. That's why the
trick with switching init_amd_nbs() to arch_initcall_sync will not
work.

We have a kind of chicken-and-egg problem here. Or is there something I missed?

I wonder if there is upstreamable option to control order of the
drivers' init by forcing link order?

Best Regards,
Jan