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[0/2] PCI: qcom: Add basic interconnect support

Message ID 20221017112449.2146-1-johan+linaro@kernel.org
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Series PCI: qcom: Add basic interconnect support | expand

Message

Johan Hovold Oct. 17, 2022, 11:24 a.m. UTC 
On Qualcomm platforms like SC8280XP and SA8540P interconnect bandwidth
must be requested before enabling interconnect clocks.

Add basic support for managing an optional "pcie-mem" interconnect path
by setting a low constraint before enabling clocks and updating it after
the link is up.

This is specifically needed to prevent a crash on SC8280XP/SA8540P when
the interconnect constraints are enforced during boot.

As support for these platforms was added in 6.1-rc1 it would be nice to
have this merged as a fix for 6.1, but deferring for 6.2 works as well.

Johan


Johan Hovold (2):
  dt-bindings: PCI: qcom: Add SC8280XP/SA8540P interconnects
  PCI: qcom: Add basic interconnect support

 .../devicetree/bindings/pci/qcom,pcie.yaml    | 25 ++++++
 drivers/pci/controller/dwc/pcie-qcom.c        | 76 +++++++++++++++++++
 2 files changed, 101 insertions(+)