From 0d68b25e9ceb344fe2f93373b1c0311d33814265 Mon Sep 17 00:00:00 2001 From: Tom O'Rourke Date: Wed, 9 Apr 2014 11:44:06 -0700 Subject: [PATCH] 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 Reviewed-by: Ben Widawsky Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_pm.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 1cce0a590979..cb261457bfd1 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3486,15 +3486,23 @@ 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); - I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */ + 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); - I915_WRITE(GEN6_RC_CONTROL, GEN6_RC_CTL_HW_ENABLE | - GEN6_RC_CTL_EI_MODE(1) | - 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); /* 4 Program defaults and thresholds for RPS*/ I915_WRITE(GEN6_RPNSWREQ, -- 2.20.1