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From 137bd7494abeceab04bf62eeec4647db5048353a Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Fri, 28 May 2021 11:02:34 -0500
Subject: [PATCH] nvme-pci: look for StorageD3Enable on companion ACPI device
instead
The documentation around the StorageD3Enable property hints that it
should be made on the PCI device. This is where newer AMD systems set
the property and it's required for S0i3 support.
So rather than look for nodes of the root port only present on Intel
systems, switch to the companion ACPI device for all systems.
David Box from Intel indicated this should work on Intel as well.
Link: https://lore.kernel.org/linux-nvme/YK6gmAWqaRmvpJXb@google.com/T/#m900552229fa455867ee29c33b854845fce80ba70
Link: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro
Fixes: df4f9bc4fb9c ("nvme-pci: add support for ACPI StorageD3Enable property")
Suggested-by: Liang Prike <Prike.Liang@amd.com>
Acked-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/nvme/host/pci.c | 24 +-----------------------
1 file changed, 1 insertion(+), 23 deletions(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index c92a15c3fbc5..60c1c83e03fa 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2834,10 +2834,7 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
#ifdef CONFIG_ACPI
static bool nvme_acpi_storage_d3(struct pci_dev *dev)
{
- struct acpi_device *adev;
- struct pci_dev *root;
- acpi_handle handle;
- acpi_status status;
+ struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
u8 val;
/*
@@ -2845,28 +2842,9 @@ static bool nvme_acpi_storage_d3(struct pci_dev *dev)
* must use D3 to support deep platform power savings during
* suspend-to-idle.
*/
- root = pcie_find_root_port(dev);
- if (!root)
- return false;
- adev = ACPI_COMPANION(&root->dev);
if (!adev)
return false;
-
- /*
- * The property is defined in the PXSX device for South complex ports
- * and in the PEGP device for North complex ports.
- */
- status = acpi_get_handle(adev->handle, "PXSX", &handle);
- if (ACPI_FAILURE(status)) {
- status = acpi_get_handle(adev->handle, "PEGP", &handle);
- if (ACPI_FAILURE(status))
- return false;
- }
-
- if (acpi_bus_get_device(handle, &adev))
- return false;
-
if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
&val))
return false;
--
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