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 Changes in v3 - remove intermediate assignment in error path (Mani) - add WARN_ON_ONCE() as a reminder to anyone ever extending the driver with support for higher speeds to update the bandwidth table Changes in v2 - update the bindings so that the interconnect-names constraints apply to all platforms (Krzysztof) Johan Hovold (2): dt-bindings: PCI: qcom: Add SC8280XP/SA8540P interconnects PCI: qcom: Add basic interconnect support .../devicetree/bindings/pci/qcom,pcie.yaml | 20 +++++ drivers/pci/controller/dwc/pcie-qcom.c | 76 +++++++++++++++++++ 2 files changed, 96 insertions(+) -- 2.37.3
