[Intel-gfx] [PATCH 4/4] drm/i915: make sure PC8 is enabled on suspend and disabled on resume

[Jesse Barnes]

From: Kristen Carlson Accardi <kristen at linux.intel.com>

This matches the runtime suspend paths and allows the system to enter
the lowest power mode at freeze time.

Signed-off-by: Kristen Carlson Accardi <kristen at linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_drv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index b6211d7..24dc856 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -558,6 +558,9 @@ static int i915_drm_freeze(struct drm_device *dev)
 
 	intel_display_set_init_power(dev_priv, false);
 
+	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
+		hsw_enable_pc8(dev_priv);
+
 	return 0;
 }
 
@@ -618,6 +621,9 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
+	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
+		hsw_disable_pc8(dev_priv);
+
 	if (drm_core_check_feature(dev, DRIVER_MODESET) &&
 	    restore_gtt_mappings) {
 		mutex_lock(&dev->struct_mutex);
-- 
1.9.1