6.13-stable review patch. If anyone has any objections, please let me know.
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From: Konrad Dybcio konrad.dybcio@oss.qualcomm.com
[ Upstream commit f00db31d235946853fb430de8c6aa1295efc8353 ]
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@linaro.org Closes: https://lore.kernel.org/linux-arm-msm/20250215-yoga-dma-coherent-v1-1-2419ee... Fixes: 6b31a9744b87 ("arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu") Signed-off-by: Konrad Dybcio konrad.dybcio@oss.qualcomm.com Link: https://lore.kernel.org/r/20250225-topic-845_smmu_not_coherent-v1-1-98ca9d17... Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 cb9fae39334c8..5eb076a109f47 100644 --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi @@ -5159,7 +5159,6 @@ 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 {