diff mbox series

nvme: put some AMD PCIE downstream NVME device to simple suspend/resume path

Message ID 1618308289-12929-1-git-send-email-Prike.Liang@amd.com
State Superseded
Headers show
Series nvme: put some AMD PCIE downstream NVME device to simple suspend/resume path | expand

Commit Message

Prike Liang April 13, 2021, 10:04 a.m. UTC 
The NVME device pluged in some AMD PCIE root port will resume timeout
from s2idle which caused by NVME power CFG lost in the SMU FW restore.
This issue can be workaround by using PCIe power set with simple
suspend/resume process path instead of APST. In the onwards ASIC will
try do the NVME shutdown save and restore in the BIOS and still need PCIe
power setting to resume from RTD3 for s2idle.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: <stable@vger.kernel.org> # 5.11+
---
 drivers/nvme/host/pci.c |  5 +++++
 drivers/pci/quirks.c    | 10 ++++++++++
 include/linux/pci.h     |  2 ++
 3 files changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6bad4d4..dd46d9e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2832,6 +2832,7 @@  static bool nvme_acpi_storage_d3(struct pci_dev *dev)
 {
 	struct acpi_device *adev;
 	struct pci_dev *root;
+	struct pci_dev *rdev;
 	acpi_handle handle;
 	acpi_status status;
 	u8 val;
@@ -2845,6 +2846,10 @@  static bool nvme_acpi_storage_d3(struct pci_dev *dev)
 	if (!root)
 		return false;
 
+	rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
+	if (rdev->dev_flags & PCI_DEV_FLAGS_AMD_NVME_SIMPLE_SUSPEND)
+		return NVME_QUIRK_SIMPLE_SUSPEND;
+
 	adev = ACPI_COMPANION(&root->dev);
 	if (!adev)
 		return false;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 653660e3..f95c8b2 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -312,6 +312,16 @@  static void quirk_nopciamd(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_8151_0,	quirk_nopciamd);
 
+static void quirk_amd_nvme_fixup(struct pci_dev *dev)
+{
+	struct pci_dev *rdev;
+
+	dev->dev_flags |= PCI_DEV_FLAGS_AMD_NVME_SIMPLE_SUSPEND;
+	pci_info(dev, "AMD simple suspend opt enabled\n");
+
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1630, quirk_amd_nvme_fixup);
+
 /* Triton requires workarounds to be used by the drivers */
 static void quirk_triton(struct pci_dev *dev)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 53f4904..a6e1b1b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -227,6 +227,8 @@  enum pci_dev_flags {
 	PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
 	/* Don't use Relaxed Ordering for TLPs directed at this device */
 	PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),
+	/* AMD simple suspend opt quirk */
+	PCI_DEV_FLAGS_AMD_NVME_SIMPLE_SUSPEND = (__force pci_dev_flags_t) (1 << 12),
 };
 
 enum pci_irq_reroute_variant {