linux-kernel - [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: <20251119-pci-dwc-suspend-rework-v1-1-aad104828562@oss.qualcomm.com>
Date: Wed, 19 Nov 2025 23:40:07 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
To: 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>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        vincent.guittot@...aro.org, zhangsenchuan@...incomputing.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Subject: [PATCH 1/2] PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3
 transition during suspend if link is not up

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>
---
 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