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authorKonrad Dybcio <konrad.dybcio@oss.qualcomm.com>2025-02-25 16:44:40 +0300
committerBjorn Andersson <andersson@kernel.org>2025-02-25 18:52:52 +0300
commitf00db31d235946853fb430de8c6aa1295efc8353 (patch)
treeadcb88eec5226aa50c2b9ac79e6bc6f8b46726e6 /tools/perf/scripts/python/exported-sql-viewer.py
parent2014c95afecee3e76ca4a56956a936e23283f05b (diff)
downloadlinux-f00db31d235946853fb430de8c6aa1295efc8353.tar.xz
Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu"
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-v1-1-2419ee184a81@linaro.org/ 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-v1-1-98ca9d17471c@oss.qualcomm.com Signed-off-by: Bjorn Andersson <andersson@kernel.org>
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