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drm/i915: We implement WaMiSetContext_Hang

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WaMiSetContext_Hang tells us that a MI_NOOP must follow MI_SET_CONTEXT.

The other thing WaMiSetContext_Hang seems to say is that URB_FENCE isn't
allowed to straddle two cachelines. But we don't issue those from the
kernel so we don't care.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-01-22 21:32:43 +02:00 committed by Daniel Vetter
parent e81ca80768
commit 2b7e8082b2
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/i915_gem_context.c
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@ -577,7 +577,10 @@ mi_set_context(struct intel_ring_buffer *ring,
MI_SAVE_EXT_STATE_EN |
MI_RESTORE_EXT_STATE_EN |
hw_flags);
/* w/a: MI_SET_CONTEXT must always be followed by MI_NOOP */
/*
* w/a: MI_SET_CONTEXT must always be followed by MI_NOOP
* WaMiSetContext_Hang:snb,ivb,vlv
*/
intel_ring_emit(ring, MI_NOOP);
if (IS_GEN7(ring->dev))