linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sc7280: Add dma-coherent property for fastrpc nodes

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Message-ID: <jlyq4byybki4cwjxjtjvr7zrjrr52ytu5qahvztva7zvxyw6xu@outa6whwpxa6>
Date: Tue, 20 May 2025 16:54:24 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Ling Xu <quic_lxu5@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ekansh.gupta@....qualcomm.com
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: sc7280: Add dma-coherent
 property for fastrpc nodes

On Tue, May 20, 2025 at 02:47:45PM +0800, Ling Xu wrote:
> 在 5/17/2025 5:48 AM, Dmitry Baryshkov 写道:
> > On Fri, May 16, 2025 at 04:30:29PM +0530, Ling Xu wrote:
> >> Add dma-cherent property to fastrpc context bank nodes to ensure that
> >> the DMA operations for these nodes are coherent.
> > 
> > Does it apply to all firmware versions?
> 
> No, it's not applicable for all the firmwares, especifically for older one.
> This is only applicable where IO coherency is enabled.

There are enough platforms using sc7280.dtsi. Which of those have new
firmware? Will this break FP5 phone? Herobrine laptops? Nothing Phone?

> >>
> >> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
> >> ---
> >>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 15 +++++++++++++++
> >>  1 file changed, 15 insertions(+)
> >>
> > 
> 
> -- 
> Thx and BRs,
> Ling Xu
> 

-- 
With best wishes
Dmitry