[Bug 83743] GPU HANG: ecode -1:0x00000000, reason: Command parser error, iir 0x00008000, action: continue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83743

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
That's a different presentation of the failure to init gm45. There the update
to HEAD was delayed until after our checks. In drm-intel-nightly, there is

commit 95468892fdfeef6d1004b524e35957629efdbe00
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Aug 7 15:39:54 2014 +0100

    drm/i915: Reset the HEAD pointer for the ring after writing START

    Ville found an old w/a documented for g4x that suggested that we need to
    reset the HEAD after writing START. This is a useful fixup for some of
    the g4x ring initialisation woes, but as usual, not all.

    v2: Do the rewrite unconditionally anyway

    References: https://bugs.freedesktop.org/show_bug.cgi?id=76554
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

which should be the right fix.

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