[PATCH 3/3] arm64: dts: qcom: sc7280: Add MDSS_CORE reset to mdss
From: Bjorn Andersson <hidden>
Date: 2025-08-12 03:11:53
Also in:
linux-arm-msm, linux-clk, lkml
Subsystem:
arm/qualcomm chromebook support, arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Linus Torvalds
Like on other platforms, if the OS does not support recovering the state left by the bootloader it needs access to MDSS_CORE, so that it can clear the MDSS configuration. Until now it seems no version of the bootloaders have done so, but e.g. the Particle Tachyon ships with a bootloader that does leave the display in a state that results in a series of iommu faults. So let's provide the reset, to allow the OS to clear that state. Signed-off-by: Bjorn Andersson <redacted> --- 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 64a2abd3010018e94eb50c534a509d6b4cf2473b..5eafcb84cd452ecc758922b69774837e9f5a899a 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi@@ -4724,6 +4724,8 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>, iommus = <&apps_smmu 0x900 0x402>; + resets = <&dispcc DISP_CC_MDSS_CORE_BCR>; + #address-cells = <2>; #size-cells = <2>; ranges;
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2.49.0