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

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Message-ID: <70ffec25-17c9-4424-9d0b-da6560f7160d@quicinc.com>
Date: Tue, 20 May 2025 14:47:45 +0800
From: Ling Xu <quic_lxu5@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.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

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.
>>
>> 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