On Tue, Feb 25, 2025 at 02:44:40PM +0100, Konrad Dybcio wrote: > 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(-) Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Should we enable dma-coherent for RB3 only then? -- With best wishes Dmitry
