On Tue, Apr 13, 2021 at 05:00:41PM +0800, Prike Liang wrote:
> 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@xxxxxxx>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # 5.11+
> ---
> drivers/nvme/host/pci.c | 5 +++++
> drivers/pci/quirks.c | 10 ++++++++++
> include/linux/pci.h | 2 ++
> include/linux/pci_ids.h | 1 +
> 4 files changed, 18 insertions(+)
>
> 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..0b175ce 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, PCI_DEVICE_ID_AMD_CZN_RP, 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 {
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index d8156a5..a82443f 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -602,6 +602,7 @@
> #define PCI_DEVICE_ID_AMD_HUDSON2_SMBUS 0x780b
> #define PCI_DEVICE_ID_AMD_HUDSON2_IDE 0x780c
> #define PCI_DEVICE_ID_AMD_KERNCZ_SMBUS 0x790b
> +#define PCI_DEVICE_ID_AMD_CZN_RP 0x1630
Why add this here when it is not needed in this file? Please read the
top of the file...
thanks,
greg k-h
