PCI: qcom: Add .get_ltssm() callback to query LTSSM status

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For older SoCs like SC7280, reading DBI LTSSM register after sending
PME_Turn_Off message causes NOC error.

To avoid unsafe DBI accesses, introduce qcom_pcie_get_ltssm() to retrieve
the LTSSM state without DBI. For newer platforms, read the LTSSM state from
the PARF_LTSSM register; for older platforms continue to retrieve it from
ELBI_SYS_STTS.

This helper is used in place of direct DBI-based link state checks in the
D3cold path after sending PME_Turn_Off message, ensuring the LTSSM state
can be queried safely even after DBI access is no longer valid.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
[mani: commit log and fixed get_ltssm() check]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260429-d3cold-v5-2-89e9735b9df6@oss.qualcomm.com

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Krishna Chaitanya Chundru 2026-04-29 12:12:24 +05:30 • committed by Manivannan Sadhasivam

parent 1d2a29ccd3

commit 131a93dbcb

1 changed files with 31 additions and 0 deletions

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drivers/pci/controller/dwc/pcie-qcom.c

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