[PATCH] drm/i915: Stop calling intel_opregion unregister/register in suspend/resume

* [PATCH] drm/i915: Stop calling intel_opregion unregister/register in suspend/resume
@ 2018-10-05 18:00 Chris Wilson
  2018-10-05 18:18 ` ✗ Fi.CI.CHECKPATCH: warning for " Patchwork
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Chris Wilson @ 2018-10-05 18:00 UTC (permalink / raw)
  To: intel-gfx; +Cc: Jani Nikula

If we reduce the suspend function for intel_opregion to do the minimum
required, the resume function can also do the simple task of notifier
the ACPI bios that we are back. This avoid some nasty restrictions on
the likes of register_acpi_notifier() that are not allowed during the
early phase of resume.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c       |   9 +-
 drivers/gpu/drm/i915/intel_opregion.c | 155 +++++++++++++++-----------
 drivers/gpu/drm/i915/intel_opregion.h |  15 +++
 3 files changed, 108 insertions(+), 71 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 193023427b40..9b0887746bac 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1919,9 +1919,7 @@ static int i915_drm_suspend(struct drm_device *dev)
 	i915_save_state(dev_priv);
 
 	opregion_target_state = suspend_to_idle(dev_priv) ? PCI_D1 : PCI_D3cold;
-	intel_opregion_notify_adapter(dev_priv, opregion_target_state);
-
-	intel_opregion_unregister(dev_priv);
+	intel_opregion_suspend(dev_priv, opregion_target_state);
 
 	intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);
 
@@ -2040,7 +2038,6 @@ static int i915_drm_resume(struct drm_device *dev)
 
 	i915_restore_state(dev_priv);
 	intel_pps_unlock_regs_wa(dev_priv);
-	intel_opregion_setup(dev_priv);
 
 	intel_init_pch_refclk(dev_priv);
 
@@ -2082,12 +2079,10 @@ static int i915_drm_resume(struct drm_device *dev)
 	 * */
 	intel_hpd_init(dev_priv);
 
-	intel_opregion_register(dev_priv);
+	intel_opregion_resume(dev_priv);
 
 	intel_fbdev_set_suspend(dev, FBINFO_STATE_RUNNING, false);
 
-	intel_opregion_notify_adapter(dev_priv, PCI_D0);
-
 	intel_power_domains_enable(dev_priv);
 
 	enable_rpm_wakeref_asserts(dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index e034b4166d32..379e8c64a248 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -773,70 +773,6 @@ static void intel_setup_cadls(struct drm_i915_private *dev_priv)
 		opregion->acpi->cadl[i] = 0;
 }
 
-void intel_opregion_register(struct drm_i915_private *dev_priv)
-{
-	struct intel_opregion *opregion = &dev_priv->opregion;
-
-	if (!opregion->header)
-		return;
-
-	if (opregion->acpi) {
-		intel_didl_outputs(dev_priv);
-		intel_setup_cadls(dev_priv);
-
-		/* Notify BIOS we are ready to handle ACPI video ext notifs.
-		 * Right now, all the events are handled by the ACPI video module.
-		 * We don't actually need to do anything with them. */
-		opregion->acpi->csts = 0;
-		opregion->acpi->drdy = 1;
-
-		opregion->acpi_notifier.notifier_call = intel_opregion_video_event;
-		register_acpi_notifier(&opregion->acpi_notifier);
-	}
-
-	if (opregion->asle) {
-		opregion->asle->tche = ASLE_TCHE_BLC_EN;
-		opregion->asle->ardy = ASLE_ARDY_READY;
-	}
-}
-
-void intel_opregion_unregister(struct drm_i915_private *dev_priv)
-{
-	struct intel_opregion *opregion = &dev_priv->opregion;
-
-	if (!opregion->header)
-		return;
-
-	if (opregion->asle)
-		opregion->asle->ardy = ASLE_ARDY_NOT_READY;
-
-	cancel_work_sync(&dev_priv->opregion.asle_work);
-
-	if (opregion->acpi) {
-		opregion->acpi->drdy = 0;
-
-		unregister_acpi_notifier(&opregion->acpi_notifier);
-		opregion->acpi_notifier.notifier_call = NULL;
-	}
-
-	/* just clear all opregion memory pointers now */
-	memunmap(opregion->header);
-	if (opregion->rvda) {
-		memunmap(opregion->rvda);
-		opregion->rvda = NULL;
-	}
-	if (opregion->vbt_firmware) {
-		kfree(opregion->vbt_firmware);
-		opregion->vbt_firmware = NULL;
-	}
-	opregion->header = NULL;
-	opregion->acpi = NULL;
-	opregion->swsci = NULL;
-	opregion->asle = NULL;
-	opregion->vbt = NULL;
-	opregion->lid_state = NULL;
-}
-
 static void swsci_setup(struct drm_i915_private *dev_priv)
 {
 	struct intel_opregion *opregion = &dev_priv->opregion;
@@ -1115,3 +1051,94 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
 
 	return ret - 1;
 }
+
+void intel_opregion_register(struct drm_i915_private *i915)
+{
+	struct intel_opregion *opregion = &i915->opregion;
+
+	if (!opregion->header)
+		return;
+
+	if (opregion->acpi) {
+		opregion->acpi_notifier.notifier_call = intel_opregion_video_event;
+		register_acpi_notifier(&opregion->acpi_notifier);
+	}
+
+	intel_opregion_resume(i915);
+}
+
+void intel_opregion_resume(struct drm_i915_private *i915)
+{
+	struct intel_opregion *opregion = &i915->opregion;
+
+	if (!opregion->header)
+		return;
+
+	if (opregion->acpi) {
+		intel_didl_outputs(i915);
+		intel_setup_cadls(i915);
+
+		/* Notify BIOS we are ready to handle ACPI video ext notifs.
+		 * Right now, all the events are handled by the ACPI video module.
+		 * We don't actually need to do anything with them. */
+		opregion->acpi->csts = 0;
+		opregion->acpi->drdy = 1;
+	}
+
+	if (opregion->asle) {
+		opregion->asle->tche = ASLE_TCHE_BLC_EN;
+		opregion->asle->ardy = ASLE_ARDY_READY;
+	}
+
+	intel_opregion_notify_adapter(i915, PCI_D0);
+}
+
+void intel_opregion_suspend(struct drm_i915_private *i915, pci_power_t state)
+{
+	struct intel_opregion *opregion = &i915->opregion;
+
+	if (!opregion->header)
+		return;
+
+	if (opregion->asle)
+		opregion->asle->ardy = ASLE_ARDY_NOT_READY;
+
+	cancel_work_sync(&i915->opregion.asle_work);
+
+	if (opregion->acpi)
+		opregion->acpi->drdy = 0;
+
+	intel_opregion_notify_adapter(i915, state);
+}
+
+void intel_opregion_unregister(struct drm_i915_private *i915)
+{
+	struct intel_opregion *opregion = &i915->opregion;
+
+	intel_opregion_suspend(i915, PCI_D1);
+
+	if (!opregion->header)
+		return;
+
+	if (opregion->acpi_notifier.notifier_call) {
+		unregister_acpi_notifier(&opregion->acpi_notifier);
+		opregion->acpi_notifier.notifier_call = NULL;
+	}
+
+	/* just clear all opregion memory pointers now */
+	memunmap(opregion->header);
+	if (opregion->rvda) {
+		memunmap(opregion->rvda);
+		opregion->rvda = NULL;
+	}
+	if (opregion->vbt_firmware) {
+		kfree(opregion->vbt_firmware);
+		opregion->vbt_firmware = NULL;
+	}
+	opregion->header = NULL;
+	opregion->acpi = NULL;
+	opregion->swsci = NULL;
+	opregion->asle = NULL;
+	opregion->vbt = NULL;
+	opregion->lid_state = NULL;
+}
diff --git a/drivers/gpu/drm/i915/intel_opregion.h b/drivers/gpu/drm/i915/intel_opregion.h
index e8498a8cda3d..d84b6d2d2fae 100644
--- a/drivers/gpu/drm/i915/intel_opregion.h
+++ b/drivers/gpu/drm/i915/intel_opregion.h
@@ -57,8 +57,14 @@ struct intel_opregion {
 #ifdef CONFIG_ACPI
 
 int intel_opregion_setup(struct drm_i915_private *dev_priv);
+
 void intel_opregion_register(struct drm_i915_private *dev_priv);
 void intel_opregion_unregister(struct drm_i915_private *dev_priv);
+
+void intel_opregion_resume(struct drm_i915_private *dev_priv);
+void intel_opregion_suspend(struct drm_i915_private *dev_priv,
+			    pci_power_t state);
+
 void intel_opregion_asle_intr(struct drm_i915_private *dev_priv);
 int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
 				  bool enable);
@@ -81,6 +87,15 @@ static inline void intel_opregion_unregister(struct drm_i915_private *dev_priv)
 {
 }
 
+void intel_opregion_resume(struct drm_i915_private *dev_priv)
+{
+}
+
+void intel_opregion_suspend(struct drm_i915_private *dev_priv,
+			    pci_power_t state)
+{
+}
+
 static inline void intel_opregion_asle_intr(struct drm_i915_private *dev_priv)
 {
 }
-- 
2.19.0

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