[Intel-gfx] [PATCH] drm/i915: Disable runtime power management during shutdown

[Imre Deak]

At least on some TGL platforms PUNIT wants to access some display HW
registers, but it doesn't handle display power managment (disabling DC
states as required) and so this register access will lead to a hang. To
prevent this disable runtime power management for poweroff and reboot.

Reported-and-tested-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0037b81d991e..6f83cca8e27b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1054,6 +1054,8 @@ static void intel_shutdown_encoders(struct drm_i915_private *dev_priv)
 void i915_driver_shutdown(struct drm_i915_private *i915)
 {
 	disable_rpm_wakeref_asserts(&i915->runtime_pm);
+	intel_runtime_pm_disable(&i915->runtime_pm);
+	intel_power_domains_disable(i915);
 
 	i915_gem_suspend(i915);
 
@@ -1069,7 +1071,10 @@ void i915_driver_shutdown(struct drm_i915_private *i915)
 	intel_suspend_encoders(i915);
 	intel_shutdown_encoders(i915);
 
+	intel_power_domains_driver_remove(i915);
 	enable_rpm_wakeref_asserts(&i915->runtime_pm);
+
+	intel_runtime_pm_driver_release(&i915->runtime_pm);
 }
 
 static bool suspend_to_idle(struct drm_i915_private *dev_priv)
-- 
2.25.1