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drm/i915/bdw: Use timeout mode for RC6 on bdw
Higher RC6 residency is observed using timeout mode instead of EI mode. This applies to Broadwell only. The difference is particularly noticeable with video playback. Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com> Reviewed-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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1 changed files with 12 additions and 4 deletions
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@ -3486,12 +3486,20 @@ static void gen8_enable_rps(struct drm_device *dev)
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for_each_ring(ring, dev_priv, unused)
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I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
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I915_WRITE(GEN6_RC_SLEEP, 0);
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if (IS_BROADWELL(dev))
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I915_WRITE(GEN6_RC6_THRESHOLD, 625); /* 800us/1.28 for TO */
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else
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I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
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/* 3: Enable RC6 */
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if (intel_enable_rc6(dev) & INTEL_RC6_ENABLE)
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rc6_mask = GEN6_RC_CTL_RC6_ENABLE;
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intel_print_rc6_info(dev, rc6_mask);
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if (IS_BROADWELL(dev))
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I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |
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GEN7_RC_CTL_TO_MODE |
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rc6_mask);
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else
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I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |
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GEN6_RC_CTL_EI_MODE(1) |
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rc6_mask);
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