linux-kernel - [PATCH V2] arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent

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Message-Id: <1677584952-17496-1-git-send-email-quic_krichai@quicinc.com>
Date:   Tue, 28 Feb 2023 17:19:12 +0530
From:   Krishna chaitanya chundru <quic_krichai@...cinc.com>
To:     helgaas@...nel.org
Cc:     linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mka@...omium.org,
        quic_vbadigan@...cinc.com, quic_hemantk@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_ramkri@...cinc.com, manivannan.sadhasivam@...aro.org,
        swboyd@...omium.org, dmitry.baryshkov@...aro.org,
        svarbanov@...sol.com, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...ainline.org, lpieralisi@...nel.org,
        robh@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
        linux-phy@...ts.infradead.org, vkoul@...nel.org, kishon@...com,
        mturquette@...libre.com, linux-clk@...r.kernel.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        stable@...r.kernel.org, Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Prasad Malisetty <pmaliset@...eaurora.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS)
Subject: [PATCH V2] arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent

If the controller is not marked as cache coherent, then kernel will
try to ensure coherency during dma-ops and that may cause data corruption.
So, mark the PCIe node as dma-coherent as the devices on PCIe bus are
cache coherent.

Cc: stable@...r.kernel.org
Fixes: 92e0ee9f83b3 ("arm64: dts: qcom: sc7280: Add PCIe and PHY related node")
Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---

changes since v1:
	- Updated the commit text.
---
---
 arch/arm64/boot/dts/qcom/sc7280.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
index bdcb749..8f4ab6b 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
@@ -2131,6 +2131,8 @@
 			pinctrl-names = "default";
 			pinctrl-0 = <&pcie1_clkreq_n>;
 
+			dma-coherent;
+
 			iommus = <&apps_smmu 0x1c80 0x1>;
 
 			iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
-- 
2.7.4