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

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Message-ID: <aR41uNTg4gUdoe/p@lizhi-Precision-Tower-5810>
Date: Wed, 19 Nov 2025 16:25:12 -0500
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	vincent.guittot@...aro.org, zhangsenchuan@...incomputing.com
Subject: Re: [PATCH 1/2] PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3
 transition during suspend if link is not up

On Wed, Nov 19, 2025 at 11:40:07PM +0530, Manivannan Sadhasivam 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@....qualcomm.com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  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
>