[PATCH 2/2] nvme-pci: add AMD PCIe quirk for suspend/resume

[Greg KH]

On Wed, Apr 14, 2021 at 04:18:01PM +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.
> 
> Update the nvme_acpi_storage_d3() _with previously added quirk.
> 
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
> [ck: split patches for nvme and pcie]
> Signed-off-by: Prike Liang <Prike.Liang at amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k at amd.com>
> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
> Cc: <stable at vger.kernel.org> # 5.11+
> ---
>  drivers/nvme/host/pci.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 6bad4d4..ce9f42b 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 +2846,12 @@ 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 && (rdev->dev_flags & PCI_DEV_FLAGS_AMD_NVME_SIMPLE_SUSPEND)) {
> +		pci_dev_put(rdev);
> +		return true;
> +	}
> +
>  	adev = ACPI_COMPANION(&root->dev);
>  	if (!adev)
>  		return false;
> -- 
> 2.7.4
> 


Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
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