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

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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@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Chris Wilson 2014-08-07 15:39:54 +01:00 • committed by Daniel Vetter

parent 4ad72b7fad

commit 95468892fd

1 changed files with 8 additions and 0 deletions

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drivers/gpu/drm/i915/intel_ringbuffer.c

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