linux-kernel - [ 017/104] drm/i915: Increase the RC6p threshold.

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Message-Id: <20130325010526.051241417@decadent.org.uk>
Date:	Mon, 25 Mar 2013 01:05:41 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Stéphane Marchesin <marcheu@...omium.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 017/104] drm/i915: Increase the RC6p threshold.

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stéphane Marchesin <marcheu@...omium.org>

commit 0920a48719f1ceefc909387a64f97563848c7854 upstream.

This increases GEN6_RC6p_THRESHOLD from 100000 to 150000. For some
reason this avoids the gen6_gt_check_fifodbg.isra warnings and
associated GPU lockups, which makes my ivy bridge machine stable.

Signed-off-by: Stéphane Marchesin <marcheu@...omium.org>
Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/i915/intel_pm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8059,7 +8059,7 @@ void gen6_enable_rps(struct drm_i915_pri
 	I915_WRITE(GEN6_RC_SLEEP, 0);
 	I915_WRITE(GEN6_RC1e_THRESHOLD, 1000);
 	I915_WRITE(GEN6_RC6_THRESHOLD, 50000);
-	I915_WRITE(GEN6_RC6p_THRESHOLD, 100000);
+	I915_WRITE(GEN6_RC6p_THRESHOLD, 150000);
 	I915_WRITE(GEN6_RC6pp_THRESHOLD, 64000); /* unused */
 
 	if (intel_enable_rc6(dev_priv->dev))


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