[PATCH 1/2] drm/amdgpu: reset the asic when hibernating

[Alex Deucher]

Some blocks require a reset to properly resume if there
is no power down of the asic like during various
hibernation steps.

Port of:
274ad65c9d02bdcbee9bae045517864c3521d530
(drm/radeon: hard reset r600 and newer GPU when hibernating.)
from radeon.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 10 +++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  6 +++---
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 6fa8268..d0d0588 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -2436,7 +2436,8 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
 				 struct drm_file *file_priv);
 void amdgpu_driver_preclose_kms(struct drm_device *dev,
 				struct drm_file *file_priv);
-int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon);
+int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon,
+		       bool freeze);
 int amdgpu_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
 u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
 int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 21f4b74..5747e37 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1037,7 +1037,7 @@ static void amdgpu_switcheroo_set_state(struct pci_dev *pdev, enum vga_switchero
 		printk(KERN_INFO "amdgpu: switched off\n");
 		drm_kms_helper_poll_disable(dev);
 		dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
-		amdgpu_suspend_kms(dev, true, true);
+		amdgpu_suspend_kms(dev, true, true, false);
 		dev->switch_power_state = DRM_SWITCH_POWER_OFF;
 	}
 }
@@ -1780,7 +1780,8 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
  * Returns 0 for success or an error on failure.
  * Called at driver suspend.
  */
-int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon)
+int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon,
+		       bool freeze)
 {
 	struct amdgpu_device *adev;
 	struct drm_crtc *crtc;
@@ -1844,7 +1845,10 @@ int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon)
 	amdgpu_bo_evict_vram(adev);
 
 	pci_save_state(dev->pdev);
-	if (suspend) {
+	if (freeze) {
+		/* reset the asic during freeze */
+		r = amdgpu_asic_reset(adev);
+	} else if (suspend) {
 		/* Shut down the device */
 		pci_disable_device(dev->pdev);
 		pci_set_power_state(dev->pdev, PCI_D3hot);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 58b1db8..eb4c9b0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -395,7 +395,7 @@ static int amdgpu_pmops_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	return amdgpu_suspend_kms(drm_dev, true, true);
+	return amdgpu_suspend_kms(drm_dev, true, true, false);
 }
 
 static int amdgpu_pmops_resume(struct device *dev)
@@ -409,7 +409,7 @@ static int amdgpu_pmops_freeze(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	return amdgpu_suspend_kms(drm_dev, false, true);
+	return amdgpu_suspend_kms(drm_dev, false, true, true);
 }
 
 static int amdgpu_pmops_thaw(struct device *dev)
@@ -434,7 +434,7 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
 	drm_kms_helper_poll_disable(drm_dev);
 	vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_OFF);
 
-	ret = amdgpu_suspend_kms(drm_dev, false, false);
+	ret = amdgpu_suspend_kms(drm_dev, false, false, false);
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 	pci_ignore_hotplug(pdev);
-- 
2.5.5