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ACPI: Check StorageD3Enable _DSD property in ACPI code

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Although first implemented for NVME, this check may be usable by
other drivers as well. Microsoft's specification explicitly mentions
that is may be usable by SATA and AHCI devices.  Google also indicates
that they have used this with SDHCI in a downstream kernel tree that
a user can plug a storage device into.

Link: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro
Suggested-by: Keith Busch <kbusch@kernel.org>
CC: Shyam-sundar S-k <Shyam-sundar.S-k@amd.com>
CC: Alexander Deucher <Alexander.Deucher@amd.com>
CC: Rafael J. Wysocki <rjw@rjwysocki.net>
CC: Prike Liang <prike.liang@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Mario Limonciello
2021-06-09 13:40:17 -05:00
committed by Christoph Hellwig
parent e0d245e223
commit 2744d7a073
3 changed files with 35 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/nvme/host/pci.c
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@@ -2828,32 +2828,6 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
return 0;
}
#ifdef CONFIG_ACPI
static bool nvme_acpi_storage_d3(struct pci_dev *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
u8 val;
/*
* Look for _DSD property specifying that the storage device on the port
* must use D3 to support deep platform power savings during
* suspend-to-idle.
*/
if (!adev)
return false;
if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
&val))
return false;
return val == 1;
}
#else
static inline bool nvme_acpi_storage_d3(struct pci_dev *dev)
{
return false;
}
#endif /* CONFIG_ACPI */
static void nvme_async_probe(void *data, async_cookie_t cookie)
{
struct nvme_dev *dev = data;
@@ -2903,7 +2877,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
quirks |= check_vendor_combination_bug(pdev);
if (!noacpi && nvme_acpi_storage_d3(pdev)) {
if (!noacpi && acpi_storage_d3(&pdev->dev)) {
/*
* Some systems use a bios work around to ask for D3 on
* platforms that support kernel managed suspend.