[PATCH 5/6] drm/i915/pm: Do pci_restore_state() in switcheroo resume hook

[Ville Syrjala <ville.syrjala@linux.intel.com>]

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

Since this switcheroo stuff bypasses all the core pm we
have to manually manage the pci state. To that end add the
missing pci_restore_state() to the switcheroo resume hook.
We already have the pci_save_state() counterpart on the
suspend side.

I suppose this might not matter in practice as the
integrated GPU probably won't lose any state in D3,
and I presume there are no machines where this code
would come into play with an Intel discrete GPU.

Arguably none of this code should exist in the driver
in the first place, and instead the entire switcheroo
mechanism should be rewritten and properly integrated into
core pm code...

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: linux-pci@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_driver.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index fe7c34045794..c3e7225ea1ba 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -1311,6 +1311,8 @@ int i915_driver_resume_switcheroo(struct drm_i915_private *i915)
 	if (ret)
 		return ret;
 
+	pci_restore_state(pdev);
+
 	ret = i915_drm_resume_early(&i915->drm);
 	if (ret)
 		return ret;
-- 
2.44.2