[Intel-gfx] [PATCH 2/4] drm/i915: Re-register PMIC bus access notifier on runtime resume

[Hans de Goede]

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.

Reported-by: Imre Deak <imre.deak at intel.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/gpu/drm/i915/i915_drv.c     | 2 ++
 drivers/gpu/drm/i915/i915_drv.h     | 1 +
 drivers/gpu/drm/i915/intel_uncore.c | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 3036d4835b0f..f037bc9db73d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2464,6 +2464,8 @@ 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/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c9b0949f6c1a..f7db152bb21f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3073,6 +3073,7 @@ extern bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *d
 extern void intel_uncore_fini(struct drm_i915_private *dev_priv);
 extern void intel_uncore_suspend(struct drm_i915_private *dev_priv);
 extern void intel_uncore_resume_early(struct drm_i915_private *dev_priv);
+extern void intel_uncore_runtime_resume(struct drm_i915_private *dev_priv);
 const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
 void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
 				enum forcewake_domains domains);
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index dc5e4f3e5a43..882cf7187a57 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -438,6 +438,12 @@ 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.enable_rc6 = sanitize_rc6_option(dev_priv, i915.enable_rc6);
-- 
2.12.2