linux-kernel - [PATCH v3 0/2] PCI: qcom: Add basic interconnect support

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Date:   Wed,  2 Nov 2022 10:07:03 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        stanimir.k.varbanov@...il.com
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Brian Masney <bmasney@...hat.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v3 0/2] PCI: qcom: Add basic interconnect support

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