From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx> There are reports that the pagetable walker cache coherency is not a given across the spectrum of SDM845/850 devices, leading to lock-ups and resets. It works fine on some devices (like the Dragonboard 845c, but not so much on the Lenovo Yoga C630). This unfortunately looks like a fluke in firmware development, where likely somewhere in the vast hypervisor stack, a change to accommodate for this was only introduced after the initial software release (which often serves as a baseline for products). Revert the change to avoid additional guesswork around crashes. This reverts commit 6b31a9744b8726c69bb0af290f8475a368a4b805. Reported-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Closes: https://lore.kernel.org/linux-arm-msm/20250215-yoga-dma-coherent-v1-1-2419ee184a81@xxxxxxxxxx/ Fixes: 6b31a9744b87 ("arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu") Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx> --- arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi index e0ce804bb1a35047b092d4745988170738a3cd03..d0314cdf0b92fd282915e7184f88b52bf309b2c2 100644 --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi @@ -5163,7 +5163,6 @@ apps_smmu: iommu@15000000 { <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 342 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 343 IRQ_TYPE_LEVEL_HIGH>; - dma-coherent; }; anoc_1_tbu: tbu@150c5000 { --- base-commit: 0226d0ce98a477937ed295fb7df4cc30b46fc304 change-id: 20250225-topic-845_smmu_not_coherent-248019b99e7e Best regards, -- Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
