linux-kernel - Re: amdgpu link problem (was Re: [git pull] drm for 5.18-rc1)

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Message-ID: <CADnq5_Nk5qsqUnA+dmdOBpH_Lu9Jfrv6n_vBRkNSxQJ=qjoh+g@mail.gmail.com>
Date:   Tue, 29 Mar 2022 10:34:33 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dave Airlie <airlied@...il.com>, Wenjing Liu <wenjing.liu@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: amdgpu link problem (was Re: [git pull] drm for 5.18-rc1)

On Mon, Mar 28, 2022 at 9:54 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I didn't notice this until now, probably because everything still
> _works_, but I get a new big warning splat at bootup on my main
> workstation these days as of the merge window changes.
>
> The full warning is attached, but it's basically the ASSERT(0) at line 938 in
>
>   drivers/gpu/drm/amd/display/dc/core/dc_link.c
>
> and it looks to have been introduced by commit c282d9512cdd
> ("drm/amd/display: factor out dp detection link training and mst top
> detection").
>
> This is the same old setup I've reported before, with some random
> Radeon card with two monitors attached (PCI ID 1002:67df rev e7,
> subsystem ID 1da2:e353).
>
> I think the card went by the name "Sapphire Pulse RX 580 8GB" in case
> any of that matters, but it's been working fine.
>
> It still works fine, it just has a big ugly boot-time splat.
>
> As mentioned, two 4K monitors attached, both over HDMI.

I think it should be fixed with this patch which is already queued up
in my -fixes PR from last week:
https://gitlab.freedesktop.org/agd5f/linux/-/commit/a572f7055067d95455850fd242d8b54ff5786cac

Alex

>
> If there is any particular info you want, just let me know where/how
> to find it, and I can provide.
>
>                       Linus