@@ -933,23 +933,23 @@ 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 (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
- 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);
+ /* Only send out PME_TURN_OFF when PCIE link is up */
+ if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_ACT) {
+ 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 (ret)
+ return ret;
- ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
- PCIE_PME_TO_L2_TIMEOUT_US/10,
- PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
- if (ret) {
- dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
- return ret;
+ ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
+ PCIE_PME_TO_L2_TIMEOUT_US/10,
+ PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
+ if (ret) {
+ dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
+ return ret;
+ }
}
if (pci->pp.ops->deinit)
The dw_pcie_suspend_noirq() function currently returns success directly if no endpoint (EP) device is connected. However, on some platforms, power loss occurs during suspend, causing dw_resume() to do nothing in this case. This results in a system halt because the DWC controller is not initialized after power-on during resume. Call deinit() in suspend and init() at resume regardless of whether there are EP device connections or not. It is not harmful to perform deinit() and init() again for the no power-off case, and it keeps the code simple and consistent in logic. Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume functionality") Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> --- .../pci/controller/dwc/pcie-designware-host.c | 30 +++++++++---------- 1 file changed, 15 insertions(+), 15 deletions(-)