[Intel-gfx] [PATCH 3/4] drm/i915: send proper opregion notifications on suspend/resume

[Jesse Barnes]

From: Kristen Carlson Accardi <kris...@linux.intel.com>

This indicates to the firmware that it can power down various other
components or bring them back up, depending on the target system state.

Signed-off-by: Kristen Carlson Accardi <kris...@linux.intel.com>
Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
---
 drivers/acpi/sleep.c            |  1 +
 drivers/gpu/drm/i915/i915_drv.c | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index c40fb2e..807f333 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -89,6 +89,7 @@ u32 acpi_target_system_state(void)
 {
        return acpi_target_sleep_state;
 }
+EXPORT_SYMBOL(acpi_target_system_state);
 
 static bool pwr_btn_event_pending;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 433bdfa..b6211d7 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -28,6 +28,7 @@
  */
 
 #include <linux/device.h>
+#include <linux/acpi.h>
 #include <drm/drmP.h>
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
@@ -491,6 +492,7 @@ static int i915_drm_freeze(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc;
+       pci_power_t opregion_target_state;
 
        intel_runtime_pm_get(dev_priv);
 
@@ -540,6 +542,12 @@ static int i915_drm_freeze(struct drm_device *dev)
 
        i915_save_state(dev);
 
+       if (acpi_target_system_state() >= ACPI_STATE_S3)
+               opregion_target_state = PCI_D3cold;
+       else
+               opregion_target_state = PCI_D1;
+       intel_opregion_notify_adapter(dev, opregion_target_state);
+
        intel_opregion_fini(dev);
 
        console_lock();
@@ -671,6 +679,8 @@ static int __i915_drm_thaw(struct drm_device *dev, bool 
restore_gtt_mappings)
        dev_priv->modeset_restore = MODESET_DONE;
        mutex_unlock(&dev_priv->modeset_restore_lock);
 
+       intel_opregion_notify_adapter(dev, PCI_D0);
+
        intel_runtime_pm_put(dev_priv);
        return 0;
 }
-- 
1.9.1

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