[PATCH v2 5/6] drm/i915/pm: Allow drivers/pci to manage our pci state normally

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Stop doing the pci_save_state(), except when we need to prevent
D3 due to BIOS bugs, so that the code in drivers/pci is allowed
to manage the state of the PCI device. Less chance something
getting left by the wayside by i915 if/when the things change in
drivers/pci.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_driver.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index a199e21c7bb4..503f1b6b694f 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -1154,9 +1154,8 @@ static int i915_drm_suspend_noirq(struct drm_device *dev, bool hibernation)
 	 * pci_save_state() prevents drivers/pci from
 	 * automagically putting the device into D3.
 	 */
-	pci_save_state(pdev);
-	if (!(hibernation && GRAPHICS_VER(dev_priv) < 6))
-		pci_set_power_state(pdev, PCI_D3hot);
+	if (hibernation && GRAPHICS_VER(dev_priv) < 6)
+		pci_save_state(pdev);
 
 	return 0;
 }
@@ -1164,6 +1163,7 @@ static int i915_drm_suspend_noirq(struct drm_device *dev, bool hibernation)
 int i915_driver_suspend_switcheroo(struct drm_i915_private *i915,
 				   pm_message_t state)
 {
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	int error;
 
 	if (drm_WARN_ON_ONCE(&i915->drm, state.event != PM_EVENT_SUSPEND &&
@@ -1181,9 +1181,8 @@ int i915_driver_suspend_switcheroo(struct drm_i915_private *i915,
 	if (error)
 		return error;
 
-	error = i915_drm_suspend_noirq(&i915->drm, false);
-	if (error)
-		return error;
+	pci_save_state(pdev);
+	pci_set_power_state(pdev, PCI_D3hot);
 
 	return 0;
 }
-- 
2.45.3