Re: [PATCH 1/2] PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if link is not up

[Vincent Guittot]

On Wed, 19 Nov 2025 at 19:10, Manivannan Sadhasivam
<manivannan.sadhasivam@xxxxxxxxxxxxxxxx> wrote:
>
> During system suspend, if the PCIe link is not up, then there is no need
> to broadcast PME_Turn_Off message and wait for L2/L3 transition. So skip
> them.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>
Tested-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>

> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 20c9333bcb1c..8fe3454f3b13 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -1129,6 +1129,9 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
>         u32 val;
>         int ret;
>
> +       if (!dw_pcie_link_up(pci))
> +               goto stop_link;
> +
>         /*
>          * If L1SS is supported, then do not put the link into L2 as some
>          * devices such as NVMe expect low resume latency.
> @@ -1162,6 +1165,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
>          */
>         udelay(1);
>
> +stop_link:
>         dw_pcie_stop_link(pci);
>         if (pci->pp.ops->deinit)
>                 pci->pp.ops->deinit(&pci->pp);
>
> --
> 2.48.1
>