PCI: qcom: Set max OPP before DBI access during resume

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During resume, qcom_pcie_icc_opp_update() may access DBI registers before
the OPP votes are restored, triggering NoC errors.

Set the PCIe controller to the maximum OPP first in resume_noirq(), then
proceed with link/DBI accesses. The OPP is later updated again based on
the actual link bandwidth requirements.

Introduce a helper to reuse the max-OPP setup code and share it with
probe().

Fixes: 5b6272e0ef ("PCI: qcom: Add OPP support to scale performance")
Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
[mani: commit log and error log rewording]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20260416-setmaxopp-v1-1-6a74e2d945a0@oss.qualcomm.com

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Qiang Yu 2026-04-16 21:16:25 -07:00 • committed by Manivannan Sadhasivam

parent 254f49634e

commit 5dc31cd4a9

1 changed files with 26 additions and 16 deletions

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

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