The patch below does not apply to the 3.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 2208d655a91f9879bd9a39ff9df05dd668b3512c Mon Sep 17 00:00:00 2001
From: Daniel Vetter <[email protected]>
Date: Fri, 14 Nov 2014 09:25:29 +0100
Subject: [PATCH] drm/i915: drop WaSetupGtModeTdRowDispatch:snb

This reverts the regressing

commit 6547fbdbfff62c99e4f7b4f985ff8b3454f33b0f
Author: Daniel Vetter <[email protected]>
Date:   Fri Dec 14 23:38:29 2012 +0100

    drm/i915: Implement WaSetupGtModeTdRowDispatch

that causes GPU hangs immediately on boot.

Reported-by: Leo Wolf <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79996
Cc: [email protected] (v3.8+)
Signed-off-by: Daniel Vetter <[email protected]>
[Jani: amended the commit message slightly.]
Signed-off-by: Jani Nikula <[email protected]>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c27b6140bfd1..ad2fd605f76b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5469,11 +5469,6 @@ 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));
-
        /* WaDisable_RenderCache_OperationalFlush:snb */
        I915_WRITE(CACHE_MODE_0, _MASKED_BIT_DISABLE(RC_OP_FLUSH_ENABLE));
 

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