[Bug 69869] [byt] GPU hang when mplayer playing video with SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69869

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[HSW/Baytrail-M bisected]   |[byt] GPU hang when mplayer
                   |GPU hang when mplayer       | playing video with SNA
                   |playing video with SNA      |

--- Comment #24 from Chris Wilson <chris at chris-wilson.co.uk> ---
Found the Haswell bug,

commit 68cef6cd281572fcfb76a341dc45b7c8e5baffe6
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Nov 7 13:09:25 2013 +0000

    sna/gen7: Request secure batches for Haswell vsync

    Since commit 8ff8eb2b38dc705f5c86f524c1cd74a811a7b04c
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Mon Sep 9 16:23:04 2013 +0100

        sna/hsw: Scanline waits require both DERRMR and forcewake

    we have been emitting LRI to enable vsync on the render ring. This
    requires a privileged batch buffer, and whilst we were checking for
    kernel support, we forgot to actually tell the kernel to submit the
    batch with the right privileges.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71328
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

The baytrail symptoms are very similar (the LRIs are not landing) but the
hardware implementation is completely difference (and the software doesn't have
the same bug as haswell unfortunately.)

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