On Wed, Sep 25, 2024 at 01:48:37PM +0800, Richard Zhu wrote:
> On i.MX8QM, PCIe link can't be re-established again in
> dw_pcie_resume_noirq(), if the LTSSM_EN bit is not cleared properly in
> dw_pcie_suspend_noirq().
>
> Add dw_pcie_stop_link() into dw_pcie_suspend_noirq() to fix this issue and
> keep symmetric in suspend/resume function since there is
> dw_pcie_start_link() in dw_pcie_resume_noirq().
>
> Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume functionality")
> Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index cb8c3c2bcc79..9ca33895456f 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -952,6 +952,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
> }
> }
>
> + dw_pcie_stop_link(pci);
> if (pci->pp.ops->deinit)
> pci->pp.ops->deinit(&pci->pp);
>
> --
> 2.37.1
>
