linux-kernel - [PATCH 3.12 055/124] drm/i915: drop WaSetupGtModeTdRowDispatch:snb

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Message-Id: <06acc2841bee97f9743e82698f94ba7cccec41fb.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:43:09 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 055/124] drm/i915: drop WaSetupGtModeTdRowDispatch:snb

From: Daniel Vetter <daniel.vetter@...ll.ch>

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

===============

commit 2208d655a91f9879bd9a39ff9df05dd668b3512c upstream.

This reverts the regressing

commit 6547fbdbfff62c99e4f7b4f985ff8b3454f33b0f
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Fri Dec 14 23:38:29 2012 +0100

    drm/i915: Implement WaSetupGtModeTdRowDispatch

that causes GPU hangs immediately on boot.

Reported-by: Leo Wolf <jclw@...il.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79996
Cc: stable@...r.kernel.org (v3.8+)
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
[Jani: amended the commit message slightly.]
Signed-off-by: Jani Nikula <jani.nikula@...el.com>

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/i915/intel_pm.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a7daa2a3ac82..cc0c7499e505 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4823,11 +4823,6 @@ static void gen6_init_clock_gating(struct drm_device *dev)
 	I915_WRITE(_3D_CHICKEN,
 		   _MASKED_BIT_ENABLE(_3D_CHICKEN_HIZ_PLANE_DISABLE_MSAA_4X_SNB));
 
-	/* WaSetupGtModeTdRowDispatch:snb */
-	if (IS_SNB_GT1(dev))
-		I915_WRITE(GEN6_GT_MODE,
-			   _MASKED_BIT_ENABLE(GEN6_TD_FOUR_ROW_DISPATCH_DISABLE));
-
 	I915_WRITE(WM3_LP_ILK, 0);
 	I915_WRITE(WM2_LP_ILK, 0);
 	I915_WRITE(WM1_LP_ILK, 0);
-- 
2.4.6

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