[PATCH 6.4 071/129] drm/i915/dgfx: Enable d3cold at s2idle

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6.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>

commit 2872144aec04baa7e43ecd2a60f7f0be3aa843fd upstream.

System wide suspend already has support for lmem save/restore during
suspend therefore enabling d3cold for s2idle and keepng it disable for
runtime PM.(Refer below commit for d3cold runtime PM disable justification)
'commit 66eb93e71a7a ("drm/i915/dgfx: Keep PCI autosuspend control
'on' by default on all dGPU")'

It will reduce the DG2 Card power consumption to ~0 Watt
for s2idle power KPI.

v2:
- Added "Cc: stable@xxxxxxxxxxxxxxx".

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8755
Cc: stable@xxxxxxxxxxxxxxx
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Tested-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
Tested-by: Jianshui Yu <Jianshui.yu@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230816125216.1722002-1-anshuman.gupta@xxxxxxxxx
(cherry picked from commit 2643e6d1f2a5e51877be24042d53cf956589be10)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_driver.c |   33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -433,7 +433,6 @@ static int i915_pcode_init(struct drm_i9
 static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
 {
 	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
-	struct pci_dev *root_pdev;
 	int ret;
 
 	if (i915_inject_probe_failure(dev_priv))
@@ -547,15 +546,6 @@ static int i915_driver_hw_probe(struct d
 
 	intel_bw_init_hw(dev_priv);
 
-	/*
-	 * FIXME: Temporary hammer to avoid freezing the machine on our DGFX
-	 * This should be totally removed when we handle the pci states properly
-	 * on runtime PM and on s2idle cases.
-	 */
-	root_pdev = pcie_find_root_port(pdev);
-	if (root_pdev)
-		pci_d3cold_disable(root_pdev);
-
 	return 0;
 
 err_opregion:
@@ -581,7 +571,6 @@ err_perf:
 static void i915_driver_hw_remove(struct drm_i915_private *dev_priv)
 {
 	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
-	struct pci_dev *root_pdev;
 
 	i915_perf_fini(dev_priv);
 
@@ -589,10 +578,6 @@ static void i915_driver_hw_remove(struct
 
 	if (pdev->msi_enabled)
 		pci_disable_msi(pdev);
-
-	root_pdev = pcie_find_root_port(pdev);
-	if (root_pdev)
-		pci_d3cold_enable(root_pdev);
 }
 
 /**
@@ -1499,6 +1484,8 @@ static int intel_runtime_suspend(struct
 {
 	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
 	struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
+	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
+	struct pci_dev *root_pdev;
 	struct intel_gt *gt;
 	int ret, i;
 
@@ -1550,6 +1537,15 @@ static int intel_runtime_suspend(struct
 		drm_err(&dev_priv->drm,
 			"Unclaimed access detected prior to suspending\n");
 
+	/*
+	 * FIXME: Temporary hammer to avoid freezing the machine on our DGFX
+	 * This should be totally removed when we handle the pci states properly
+	 * on runtime PM.
+	 */
+	root_pdev = pcie_find_root_port(pdev);
+	if (root_pdev)
+		pci_d3cold_disable(root_pdev);
+
 	rpm->suspended = true;
 
 	/*
@@ -1588,6 +1584,8 @@ static int intel_runtime_resume(struct d
 {
 	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
 	struct intel_runtime_pm *rpm = &dev_priv->runtime_pm;
+	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
+	struct pci_dev *root_pdev;
 	struct intel_gt *gt;
 	int ret, i;
 
@@ -1601,6 +1599,11 @@ static int intel_runtime_resume(struct d
 
 	intel_opregion_notify_adapter(dev_priv, PCI_D0);
 	rpm->suspended = false;
+
+	root_pdev = pcie_find_root_port(pdev);
+	if (root_pdev)
+		pci_d3cold_enable(root_pdev);
+
 	if (intel_uncore_unclaimed_mmio(&dev_priv->uncore))
 		drm_dbg(&dev_priv->drm,
 			"Unclaimed access during suspend, bios?\n");





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