[PATCH v2 4/5] PCI: dwc: Skip PME_Turn_Off message if there is no endpoint connected
From: Richard Zhu <hongxing.zhu@nxp.com>
Date: 2025-06-18 02:43:35
Also in:
imx, linux-pci, lkml
Subsystem:
pci driver for synopsys designware, pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Jingoo Han, Manivannan Sadhasivam, Lorenzo Pieralisi, Krzysztof Wilczyński, Bjorn Helgaas, Linus Torvalds
Skip PME_Turn_Off message if there is no endpoint connected. Signed-off-by: Richard Zhu <hongxing.zhu@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