[PATCH] drm/i915: Ajdust down threshold in intel_pm.

From: "Stéphane Marchesin" <marcheu@chromium.org>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH] drm/i915: Ajdust down threshold in intel_pm.
Date: Tue,  3 Jul 2012 14:16:42 -0700	[thread overview]
Message-ID: <1341350202-8664-1-git-send-email-marcheu@chromium.org> (raw)

The up and down thresholds are very asymetric, so it is possible
to have a case where a spike of rendering increases the GPU clock to
the max (because the up threshold is low) and then a simple blinking
cursor is enough to keep the clock at the maximum speed forever
(because the down threshold is high).

Lowering the down threshold allows the GPU clock to go back down even
when there is a blinking cursor on the screen.

Signed-off-by: Stéphane Marchesin <marcheu@chromium.org>
---
 drivers/gpu/drm/i915/intel_pm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d0ce2a5..eba882a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2432,7 +2432,7 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
 		   dev_priv->max_delay << 24 |
 		   dev_priv->min_delay << 16);
 	I915_WRITE(GEN6_RP_UP_THRESHOLD, 10000);
-	I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 1000000);
+	I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 100000);
 	I915_WRITE(GEN6_RP_UP_EI, 100000);
 	I915_WRITE(GEN6_RP_DOWN_EI, 5000000);
 	I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
-- 
1.7.5.3.367.ga9930

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