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

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Message-Id: <20221017112449.2146-1-johan+linaro@kernel.org>
Date:   Mon, 17 Oct 2022 13:24:47 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>
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>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        quic_vbadigan@...cinc.com, 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 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


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(+)

-- 
2.37.3