linux-kernel - Re: [PATCH v1] platform/x86/amd/pmc: Get smu version before reading dram size

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Date:   Mon, 30 Oct 2023 10:09:30 -0600
From:   Mark Hasemeyer <markhas@...omium.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Sanket Goswami <Sanket.Goswami@....com>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v1] platform/x86/amd/pmc: Get smu version before reading
 dram size

> Hi,
>
> Thank you for your patch. This has already come up but no acceptable patch
> has emerged since. Please see this thread for what needs to be done if you
> want to provide one (or maybe Shyam already has one which has just not
> been sent out yet):
>
> https://lore.kernel.org/platform-driver-x86/3b224c62-a1d8-41bd-aced-5825f5f20e66@amd.com/
>
> (Since this dram size is on an init path that always needs SMU version,
> the SMU version can just be called by the init unconditonally rather than
> adding more of this lazy initialization everywhere).

Thanks for pointing me to that thread. I think Shyam/AMD can come up
with a better long term solution, but it may be worth pushing this
patch through for a couple reasons:
1. Probing of the driver currently fails on STB enabled systems with a
Mendocino SoC. A slower boot time is better than the driver failing to
load IMO.
2. This patch only affects Mendocino SoCs, and was a suggested
solution from Mario in the thread you mentioned.

That said, I can also just disable STB for now...