[Bug 77565] [BDW bisected]igt/pm_pc8 subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77565

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #6 from lu hua <huax.lu at intel.com> ---

> 
> Please try the following branch:
> https://github.com/ideak/linux/commits/bdw-rc6-rpm-fix

Apply this patch fail, test the patch as below:
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 75c1c76..b1b5fd8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3262,6 +3262,10 @@ int intel_enable_rc6(const struct drm_device *dev)
        if (INTEL_INFO(dev)->gen < 5)
                return 0;

+       /* Disable RC6 on Broadwell for now */
+       if (IS_BROADWELL(dev))
+               return 0;
+
        /* Respect the kernel parameter if it is set */
        if (i915.enable_rc6 >= 0)
                return i915.enable_rc6;

The hang still exists.
output:
IGT-Version: 1.6-g78e4c2b (x86_64) (Linux: 3.15.0-rc2_prts_78d88b_20140425
x86_64)
Runtime PM support: 1
PC8 residency support: 1

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