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Commit 0d68b25e authored by Tom O'Rourke's avatar Tom O'Rourke Committed by Jani Nikula
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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: default avatarTom O'Rourke <Tom.O'Rourke@intel.com>
Reviewed-by: default avatarBen Widawsky <ben@bwidawsk.net>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent 84a2ab8e

drivers/gpu/drm/i915/intel_pm.c

+12 −4
Original line number Diff line number Diff line
@@ -3486,12 +3486,20 @@ static void gen8_enable_rps(struct drm_device *dev) 
	for_each_ring(ring, dev_priv, unused)

		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);

	I915_WRITE(GEN6_RC_SLEEP, 0);

	if (IS_BROADWELL(dev))

		I915_WRITE(GEN6_RC6_THRESHOLD, 625); /* 800us/1.28 for TO */

	else

		I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */



	/* 3: Enable RC6 */

	if (intel_enable_rc6(dev) & INTEL_RC6_ENABLE)

		rc6_mask = GEN6_RC_CTL_RC6_ENABLE;

	intel_print_rc6_info(dev, rc6_mask);

	if (IS_BROADWELL(dev))

		I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |

				GEN7_RC_CTL_TO_MODE |

				rc6_mask);

	else

		I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE |

				GEN6_RC_CTL_EI_MODE(1) |

				rc6_mask);