RE: [PATCH 3/7] drm/amdgpu: disentangle HG systems from vgaswitcheroo

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-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Alex Deucher
Sent: Tuesday, March 9, 2021 12:10 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Subject: [PATCH 3/7] drm/amdgpu: disentangle HG systems from vgaswitcheroo

There's no need to keep vgaswitcheroo around for HG systems.  They don't use muxes and their power control is handled via ACPI.

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 38 +++++++++-------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 34 ++++++++-----------
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c    |  9 ++---
 4 files changed, 34 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index b5310b35721c..d47626ce9bc5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1260,7 +1260,7 @@ void amdgpu_device_program_register_sequence(struct amdgpu_device *adev,
 					     const u32 *registers,
 					     const u32 array_size);
 
-bool amdgpu_device_supports_atpx(struct drm_device *dev);
+bool amdgpu_device_supports_px(struct drm_device *dev);
 bool amdgpu_device_supports_boco(struct drm_device *dev);  bool amdgpu_device_supports_baco(struct drm_device *dev);  bool amdgpu_device_is_peer_accessible(struct amdgpu_device *adev, diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 6eb3b4d2c9b2..ac5f7837285b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -211,18 +211,18 @@ static DEVICE_ATTR(serial_number, S_IRUGO,
 		amdgpu_device_get_serial_number, NULL);
 
 /**
- * amdgpu_device_supports_atpx - Is the device a dGPU with HG/PX power control
+ * amdgpu_device_supports_px - Is the device a dGPU with ATPX power 
+ control
  *
  * @dev: drm_device pointer
  *
- * Returns true if the device is a dGPU with HG/PX power control,
+ * Returns true if the device is a dGPU with ATPX power control,
  * otherwise return false.
  */
-bool amdgpu_device_supports_atpx(struct drm_device *dev)
+bool amdgpu_device_supports_px(struct drm_device *dev)
 {
 	struct amdgpu_device *adev = drm_to_adev(dev);
 
-	if (adev->flags & AMD_IS_PX)
+	if ((adev->flags & AMD_IS_PX) && !amdgpu_is_atpx_hybrid())
 		return true;
 	return false;
 }
@@ -232,14 +232,15 @@ bool amdgpu_device_supports_atpx(struct drm_device *dev)
  *
  * @dev: drm_device pointer
  *
- * Returns true if the device is a dGPU with HG/PX power control,
+ * Returns true if the device is a dGPU with ACPI power control,
  * otherwise return false.
  */
 bool amdgpu_device_supports_boco(struct drm_device *dev)  {
 	struct amdgpu_device *adev = drm_to_adev(dev);
 
-	if (adev->has_pr3)
+	if (adev->has_pr3 ||
+	    ((adev->flags & AMD_IS_PX) && amdgpu_is_atpx_hybrid()))
 		return true;
 	return false;
 }
@@ -1429,7 +1430,7 @@ static void amdgpu_switcheroo_set_state(struct pci_dev *pdev,
 	struct drm_device *dev = pci_get_drvdata(pdev);
 	int r;
 
-	if (amdgpu_device_supports_atpx(dev) && state == VGA_SWITCHEROO_OFF)
+	if (amdgpu_device_supports_px(dev) && state == VGA_SWITCHEROO_OFF)
 		return;
 
 	if (state == VGA_SWITCHEROO_ON) {
@@ -3213,7 +3214,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	struct drm_device *ddev = adev_to_drm(adev);
 	struct pci_dev *pdev = adev->pdev;
 	int r, i;
-	bool atpx = false;
+	bool px = false;
 	u32 max_MBps;
 
 	adev->shutdown = false;
@@ -3385,16 +3386,12 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
 		vga_client_register(adev->pdev, adev, NULL, amdgpu_device_vga_set_decode);
 
-	if (amdgpu_device_supports_atpx(ddev))
-		atpx = true;
-	if (amdgpu_has_atpx() &&
-	    (amdgpu_is_atpx_hybrid() ||
-	     amdgpu_has_atpx_dgpu_power_cntl()) &&
-	    !pci_is_thunderbolt_attached(adev->pdev))
+	if (amdgpu_device_supports_px(ddev)) {
[Quan, Evan] Maybe this should be " amdgpu_device_supports_px(ddev) && amdgpu_has_atpx_dgpu_power_cntl() && !pci_is_thunderbolt_attached(adev->pdev)".
+		px = true;
 		vga_switcheroo_register_client(adev->pdev,
-					       &amdgpu_switcheroo_ops, atpx);
-	if (atpx)
+					       &amdgpu_switcheroo_ops, px);
 		vga_switcheroo_init_domain_pm_ops(adev->dev, &adev->vga_pm_domain);
+	}
 
 	if (amdgpu_emu_mode == 1) {
 		/* post the asic on emulation mode */ @@ -3576,7 +3573,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 
 failed:
 	amdgpu_vf_error_trans_all(adev);
-	if (atpx)
+	if (px)
 		vga_switcheroo_fini_domain_pm_ops(adev->dev);
 
 failed_unmap:
@@ -3636,13 +3633,10 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
 
 	kfree(adev->bios);
 	adev->bios = NULL;
-	if (amdgpu_has_atpx() &&
-	    (amdgpu_is_atpx_hybrid() ||
-	     amdgpu_has_atpx_dgpu_power_cntl()) &&
-	    !pci_is_thunderbolt_attached(adev->pdev))
+	if (amdgpu_device_supports_px(adev_to_drm(adev))) {
[Quan, Evan] Same as above
 		vga_switcheroo_unregister_client(adev->pdev);
-	if (amdgpu_device_supports_atpx(adev_to_drm(adev)))
 		vga_switcheroo_fini_domain_pm_ops(adev->dev);
+	}
 	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
 		vga_client_register(adev->pdev, NULL, NULL, NULL);
 	if (adev->rio_mem)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 8d4fbee01011..3e6bb7d79652 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1301,9 +1301,7 @@ static int amdgpu_pmops_prepare(struct device *dev)
 	/* Return a positive number here so
 	 * DPM_FLAG_SMART_SUSPEND works properly
 	 */
-	if ((amdgpu_device_supports_atpx(drm_dev) &&
-	    amdgpu_is_atpx_hybrid()) ||
-	    amdgpu_device_supports_boco(drm_dev))
+	if (amdgpu_device_supports_boco(drm_dev))
 		return pm_runtime_suspended(dev) &&
 			pm_suspend_via_firmware();
 
@@ -1392,7 +1390,7 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
 	}
 
 	adev->in_runpm = true;
-	if (amdgpu_device_supports_atpx(drm_dev))
+	if (amdgpu_device_supports_px(drm_dev))
 		drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
 
 	ret = amdgpu_device_suspend(drm_dev, false); @@ -1401,16 +1399,14 @@ static int amdgpu_pmops_runtime_suspend(struct device *dev)
 		return ret;
 	}
 
-	if (amdgpu_device_supports_atpx(drm_dev)) {
+	if (amdgpu_device_supports_px(drm_dev)) {
 		/* Only need to handle PCI state in the driver for ATPX
 		 * PCI core handles it for _PR3.
 		 */
-		if (!amdgpu_is_atpx_hybrid()) {
-			amdgpu_device_cache_pci_state(pdev);
-			pci_disable_device(pdev);
-			pci_ignore_hotplug(pdev);
-			pci_set_power_state(pdev, PCI_D3cold);
-		}
+		amdgpu_device_cache_pci_state(pdev);
+		pci_disable_device(pdev);
+		pci_ignore_hotplug(pdev);
+		pci_set_power_state(pdev, PCI_D3cold);
 		drm_dev->switch_power_state = DRM_SWITCH_POWER_DYNAMIC_OFF;
 	} else if (amdgpu_device_supports_baco(drm_dev)) {
 		amdgpu_device_baco_enter(drm_dev);
@@ -1429,19 +1425,17 @@ static int amdgpu_pmops_runtime_resume(struct device *dev)
 	if (!adev->runpm)
 		return -EINVAL;
 
-	if (amdgpu_device_supports_atpx(drm_dev)) {
+	if (amdgpu_device_supports_px(drm_dev)) {
 		drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
 
 		/* Only need to handle PCI state in the driver for ATPX
 		 * PCI core handles it for _PR3.
 		 */
-		if (!amdgpu_is_atpx_hybrid()) {
-			pci_set_power_state(pdev, PCI_D0);
-			amdgpu_device_load_pci_state(pdev);
-			ret = pci_enable_device(pdev);
-			if (ret)
-				return ret;
-		}
+		pci_set_power_state(pdev, PCI_D0);
+		amdgpu_device_load_pci_state(pdev);
+		ret = pci_enable_device(pdev);
+		if (ret)
+			return ret;
 		pci_set_master(pdev);
 	} else if (amdgpu_device_supports_boco(drm_dev)) {
 		/* Only need to handle PCI state in the driver for ATPX @@ -1452,7 +1446,7 @@ static int amdgpu_pmops_runtime_resume(struct device *dev)
 		amdgpu_device_baco_exit(drm_dev);
 	}
 	ret = amdgpu_device_resume(drm_dev, false);
-	if (amdgpu_device_supports_atpx(drm_dev))
+	if (amdgpu_device_supports_px(drm_dev))
 		drm_dev->switch_power_state = DRM_SWITCH_POWER_ON;
 	adev->in_runpm = false;
 	return 0;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 8e6ef4d8b7ee..86eeeb4f3513 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -161,7 +161,7 @@ int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags)
 		goto out;
 	}
 
-	if (amdgpu_device_supports_atpx(dev) &&
+	if (amdgpu_device_supports_px(dev) &&
 	    (amdgpu_runtime_pm != 0)) { /* enable runpm by default for atpx */
 		adev->runpm = true;
 		dev_info(adev->dev, "Using ATPX for runtime pm\n"); @@ -202,13 +202,10 @@ int amdgpu_driver_load_kms(struct amdgpu_device *adev, unsigned long flags)
 
 	if (adev->runpm) {
 		/* only need to skip on ATPX */
-		if (amdgpu_device_supports_atpx(dev) &&
-		    !amdgpu_is_atpx_hybrid())
+		if (amdgpu_device_supports_px(dev))
 			dev_pm_set_driver_flags(dev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
 		/* we want direct complete for BOCO */
-		if ((amdgpu_device_supports_atpx(dev) &&
-		    amdgpu_is_atpx_hybrid()) ||
-		    amdgpu_device_supports_boco(dev))
+		if (amdgpu_device_supports_boco(dev))
 			dev_pm_set_driver_flags(dev->dev, DPM_FLAG_SMART_PREPARE |
 						DPM_FLAG_SMART_SUSPEND |
 						DPM_FLAG_MAY_SKIP_RESUME);
--
2.29.2

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