[PATCH v2 4/5] PCI: dwc: Skip PME_Turn_Off message if there is no endpoint connected

[Frank Li]

On Wed, Jun 18, 2025 at 10:41:15AM +0800, Richard Zhu wrote:
> Skip PME_Turn_Off message if there is no endpoint connected.
>
> Signed-off-by: Richard Zhu <hongxing.zhu at nxp.com>

Reviewed-by: Frank Li <Frank.Li at nxp.com>

> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 2d58a3eb94a1..228484e3ea4a 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -1035,12 +1035,15 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
>  	if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
>  		return 0;
>
> -	if (pci->pp.ops->pme_turn_off) {
> -		pci->pp.ops->pme_turn_off(&pci->pp);
> -	} else {
> -		ret = dw_pcie_pme_turn_off(pci);
> -		if (ret)
> -			return ret;
> +	/* Skip PME_Turn_Off message if there is no endpoint connected */
> +	if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_WAIT) {
> +		if (pci->pp.ops->pme_turn_off) {
> +			pci->pp.ops->pme_turn_off(&pci->pp);
> +		} else {
> +			ret = dw_pcie_pme_turn_off(pci);
> +			if (ret)
> +				return ret;
> +		}
>  	}
>
>  	if (dwc_quirk(pci, QUIRK_NOL2POLL_IN_PM)) {
> --
> 2.37.1
>