linux-kernel - Re: [PATCH] Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps

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Message-ID: <bwj3a7cbxqh2eeglvx6vh7bmjonbfufup4clgdogoub77mkjfo@wa4jmtvwnrvx>
Date: Tue, 25 Feb 2025 23:06:23 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Konrad Dybcio <konradybcio@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, Konrad Dybcio <quic_kdybcio@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH] Revert "arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on
 apps_smmu"

On Tue, Feb 25, 2025 at 02:44:40PM +0100, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> 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@...aro.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@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 -
>  1 file changed, 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Should we enable dma-coherent for RB3 only then?


-- 
With best wishes
Dmitry