> -----Original Message-----
> From: Hongxing Zhu <hongxing.zhu@xxxxxxx>
> Sent: 2025年8月22日 16:44
> To: Frank Li <frank.li@xxxxxxx>; jingoohan1@xxxxxxxxx;
> l.stach@xxxxxxxxxxxxxx; lpieralisi@xxxxxxxxxx; kwilczynski@xxxxxxxxxx;
> mani@xxxxxxxxxx; robh@xxxxxxxxxx; bhelgaas@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> festevam@xxxxxxxxx
> Cc: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> imx@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Hongxing Zhu
> <hongxing.zhu@xxxxxxx>
> Subject: [PATCH v4 1/6] PCI: dwc: Remove the L1SS check before putting the
> link into L2
>
> Since this L1SS check is just an encapsulation problem, and the ASPM
> shouldn't leak out here. Remove the L1SS check during L2 entry.
>
> Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume
> functionality")
> Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 7 -------
> 1 file changed, 7 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 952f8594b5012..1e130091d62a0 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -1009,13 +1009,6 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
> u32 val;
> int ret;
>
> - /*
> - * If L1SS is supported, then do not put the link into L2 as some
> - * devices such as NVMe expect low resume latency.
> - */
> - if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) &
> PCI_EXP_LNKCTL_ASPM_L1)
> - return 0;
> -
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -1005,7 +1005,6 @@ static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
int dw_pcie_suspend_noirq(struct dw_pcie *pci)
{
- u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
It's my fault that one line is missing to be deleted. This change would be
added later with other review comments later.
Best Regards
Richard Zhu
> if (pci->pp.ops->pme_turn_off) {
> pci->pp.ops->pme_turn_off(&pci->pp);
> } else {
> --
> 2.37.1
