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| author | Konrad Dybcio <konrad.dybcio@oss.qualcomm.com> | 2025-02-25 14:44:40 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-28 22:04:51 +0100 |
| commit | 9e6e9fc90258a318d30b417bcccda908bb82ee9d (patch) | |
| tree | 81ef431980324206d488f31385d68fb80d744cdc /arch | |
| parent | 38b03eae7f07adca26e031110d162a1ab3ec667c (diff) | |
| download | linux-9e6e9fc90258a318d30b417bcccda908bb82ee9d.tar.gz linux-9e6e9fc90258a318d30b417bcccda908bb82ee9d.tar.bz2 linux-9e6e9fc90258a318d30b417bcccda908bb82ee9d.zip | |
Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu"
[ 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-v1-1-2419ee184a81@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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi index cb9fae39334c..5eb076a109f4 100644 --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi @@ -5159,7 +5159,6 @@ <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 { |