[Bug 104731] UVD lockup on MPEG2 missing Field

[Bug 104731] UVD lockup on MPEG2 missing Field

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https://bugs.freedesktop.org/show_bug.cgi?id=104731

            Bug ID: 104731
           Summary: UVD lockup on MPEG2 missing Field
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bugzilla77@free.fr

We have some broken MPEG2 samples causing lockup in UVD (not only, and also
crashing some libs).

At least happens with Radeon 6450 / UVD 3.

Content and not properly packetize and causes video players to send samples
containing reference to a missing previous iframe field.

Sample:
https://streams.videolan.org/streams/ts/mpeg2-field-encoded-bff.ts

Our own tracking of this issue
https://trac.videolan.org/vlc/ticket/18916

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[Bug 104731] UVD lockup on MPEG2 missing Field

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https://bugs.freedesktop.org/show_bug.cgi?id=104731

--- Comment #1 from Andy Furniss <adf.lists@gmail.com> ---
FWIW UVD has never (AFAIK) been able to decode field coded mpeg2, as it seems
to be quite rare in the wild it doesn't come up much.

A long time ago I managed to lock older h/w with a normal compliance sample.

With my current h/w (tonga) I can't lock with this sample or the compliance -
neither decode properly of course, so maybe luck involved in avoiding the lock.

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[Bug 104731] UVD lockup on MPEG2 missing Field

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https://bugs.freedesktop.org/show_bug.cgi?id=104731

Christian König <ckoenig.leichtzumerken@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #2 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
Works as designed.

On older hardware generations the UVD firmware just stops all processing when
it finds an invalid stream.

The driver is then responsible to reset the UVD block with a specific reset
procedure to get it working again.

Unfortunately this reset procedure never made it through IP review and so
wasn't released to the public.

The only other option is a full ASIC reset which is implemented, but doesn't
works so well.

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[Bug 104731] UVD lockup on MPEG2 missing Field

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https://bugs.freedesktop.org/show_bug.cgi?id=104731

--- Comment #3 from Francois Cartegnie <bugzilla77@free.fr> ---
What do you mean by stopping ? 
Ring N lockup kernel messages ?

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[Bug 104731] UVD lockup on MPEG2 missing Field

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https://bugs.freedesktop.org/show_bug.cgi?id=104731

--- Comment #4 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
(In reply to Francois Cartegnie from comment #3)
> What do you mean by stopping ? 
> Ring N lockup kernel messages ?

Yes, exactly.

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