[Intel-gfx] [PATCH] drm/i915: make sure PC8 is enabled on suspend and disabled on resume v3

[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.

v2: move disable_pc8 call to thaw_early (Imre)
    move enable_pc8 to freeze_late (Imre/Jesse)
v3: drop spurious hunk from _freeze now that we have freeze_late (Jesse)

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 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index a573f5a..ff291c0 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -608,6 +608,9 @@ static int i915_drm_thaw_early(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
+	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
+		hsw_disable_pc8(dev_priv);
+
 	intel_uncore_early_sanitize(dev);
 	intel_uncore_sanitize(dev);
 	intel_power_domains_init_hw(dev_priv);
@@ -939,6 +942,21 @@ static int i915_pm_freeze(struct device *dev)
 	return i915_drm_freeze(drm_dev);
 }
 
+static int i915_pm_freeze_late(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct drm_device *drm_dev = pci_get_drvdata(pdev);
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+
+	if (IS_HASWELL(drm_dev) || IS_BROADWELL(drm_dev))
+		hsw_enable_pc8(dev_priv);
+
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, PCI_D3hot);
+
+	return 0;
+}
+
 static int i915_pm_thaw_early(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
@@ -1476,6 +1494,7 @@ static const struct dev_pm_ops i915_pm_ops = {
 	.resume_early = i915_pm_resume_early,
 	.resume = i915_pm_resume,
 	.freeze = i915_pm_freeze,
+	.freeze_late = i915_pm_freeze_late,
 	.thaw_early = i915_pm_thaw_early,
 	.thaw = i915_pm_thaw,
 	.poweroff = i915_pm_poweroff,
-- 
1.9.1