Bug #2834 ยป jiri.diff
| sys/dev/drm/i915/intel_ringbuffer.c | ||
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else
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ring_setup_phys_status_page(ring);
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/* Enforce ordering by reading HEAD register back */
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I915_READ_HEAD(ring);
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/* Initialize the ring. This must happen _after_ we've cleared the ring
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* registers with the above sequence (the readback of the HEAD registers
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* also enforces ordering), otherwise the hw might lose the new ring
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