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PCI: dwc: Proceed with system suspend even if the endpoint doesn't respond with PME_TO_Ack message

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PCIe spec r7.0, sec 5.3.3.2.1, recommends proceeding with L2/L3 sequence
even if one or devices do not respond with PME_TO_Ack message after 10ms
timeout.

So just print a warning if the timeout happens and proceed with the system
suspend.

Reported-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-HDK
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260217113142.9140-1-manivannan.sadhasivam@oss.qualcomm.com
This commit is contained in:
Manivannan Sadhasivam 2026-02-17 17:01:42 +05:30 committed by Manivannan Sadhasivam
parent 6de23f81a5
commit eed3907754
1 changed files with 7 additions and 3 deletions
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10
drivers/pci/controller/dwc/pcie-designware-host.c
View File

@ -1256,9 +1256,13 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
PCIE_PME_TO_L2_TIMEOUT_US/10,
PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
if (ret) {
/* Only log message when LTSSM isn't in DETECT or POLL */
dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
return ret;
/*
* Failure is non-fatal since spec r7.0, sec 5.3.3.2.1,
* recommends proceeding with L2/L3 sequence even if one or more
* devices do not respond with PME_TO_Ack after 10ms timeout.
*/
dev_warn(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
ret = 0;
}
/*