[PATCH] drm/i915/bdw: cancel the SW turbo tasks before runtime suspending

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

If we don't cancel them, we may end up running them while the device
is runtime suspended, which will trigger lots and lots of WARNs on
dmesg.

Regression introduced by:
commit c76bb61a71083b2d90504cc6d0dda2047c5d63ca
Author: Daisy Sun <daisy.sun@intel.com>
Date:   Mon Aug 11 11:08:38 2014 -0700
    drm/i915/bdw: BDW Software Turbo

Testcase: igt/pm_rpm/gem-execbuf (you may have to run it a few times)
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8ff3755..4ce217b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1448,6 +1448,10 @@ static int intel_runtime_suspend(struct device *device)
 	 * intel_mark_idle().
 	 */
 	cancel_work_sync(&dev_priv->rps.work);
+	if (dev_priv->rps.is_bdw_sw_turbo) {
+		del_timer_sync(&dev_priv->rps.sw_turbo.flip_timer);
+		cancel_work_sync(&dev_priv->rps.sw_turbo.work_max_freq);
+	}
 	intel_runtime_pm_disable_interrupts(dev);
 
 	ret = intel_suspend_complete(dev_priv);
-- 
2.1.0