drm/i915: Re-register PMIC bus access notifier on runtime resume

intel_uncore_suspend() unregisters the uncore code's PMIC bus access
notifier and gets called on both normal and runtime suspend.

intel_uncore_resume_early() re-registers the notifier, but only on
normal resume. Add a new intel_uncore_runtime_resume() function which
only re-registers the notifier and call that on runtime resume.

Cc: stable@vger.kernel.org
Reported-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114135518.15981-2-hdegoede@redhat.com
(cherry picked from commit bedf4d79c3654921839b62246b0965ddb308b201)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

3 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 3db5851756f0..34191028bbad 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2618,6 +2618,8 @@ static int intel_runtime_resume(struct device *kdev)
                 ret = vlv_resume_prepare(dev_priv, true);
         }
 
+        intel_uncore_runtime_resume(dev_priv);
+
         /*
          * No point of rolling back things in case of an error, as the best
          * we can do is to hope that things will still work (and disable RPM).
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index cb48c8b92aa3..8c2ce81f01c2 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -434,6 +434,12 @@ void intel_uncore_resume_early(struct drm_i915_private *dev_priv)
         i915_check_and_clear_faults(dev_priv);
 }
 
+void intel_uncore_runtime_resume(struct drm_i915_private *dev_priv)
+{
+        iosf_mbi_register_pmic_bus_access_notifier(
+                &dev_priv->uncore.pmic_bus_access_nb);
+}
+
 void intel_uncore_sanitize(struct drm_i915_private *dev_priv)
 {
         i915_modparams.enable_rc6 =
diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h
index 582771251b57..9ce079b5dd0d 100644
--- a/drivers/gpu/drm/i915/intel_uncore.h
+++ b/drivers/gpu/drm/i915/intel_uncore.h
@@ -134,6 +134,7 @@ bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv
 void intel_uncore_fini(struct drm_i915_private *dev_priv);
 void intel_uncore_suspend(struct drm_i915_private *dev_priv);
 void intel_uncore_resume_early(struct drm_i915_private *dev_priv);
+void intel_uncore_runtime_resume(struct drm_i915_private *dev_priv);
 
 u64 intel_uncore_edram_size(struct drm_i915_private *dev_priv);
 void assert_forcewakes_inactive(struct drm_i915_private *dev_priv);