linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8650: set ufs as dma coherent

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Message-ID: <b4dc1a86-4d92-4029-badc-5b77ea23c4f9@kernel.org>
Date: Wed, 8 Oct 2025 11:57:08 +0900
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sm8650: set ufs as dma coherent

On 08/10/2025 03:53, Neil Armstrong wrote:
> The UFS device is ovbiously dma coherent like the other IOMMU devices
> like usb, mmc, ... let's fix this by adding the flag.
> 
> To be sure an extensive test has been performed to be sure it's
> safe, as downstream uses this flag for UFS as well.
> 
> As an experiment, I checked how the dma-coherent could impact
> the UFS bandwidth, and it happens the max bandwidth on cached
> write is slighly highter (up to 10%) while using less cpu time
> since cache sync/flush is skipped.
> 
> Fixes: 10e024671295 ("arm64: dts: qcom: sm8650: add interconnect dependent device nodes")
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof