[Bug 79996] [SNB bisected] GPU hang Linux 3.15 (Shuttle SH67, Xeon E3 1235)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79996

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm. We clear all the bits we should be setting for snb gt1.

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 76c5e4aa4dcf..03d90e4003ee 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5188,7 +5188,7 @@ static void gen6_init_clock_gating(struct drm_device
*dev)
        /* WaSetupGtModeTdRowDispatch:snb */
        if (IS_SNB_GT1(dev))
                I915_WRITE(GEN6_GT_MODE,
-                         
_MASKED_BIT_ENABLE(GEN6_TD_FOUR_ROW_DISPATCH_DISABLE));
+                          _MASKED_BIT_ENABLE(0x01ff));

        ilk_init_lp_watermarks(dev);

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