linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7280: Mark FastRPC context banks as dma-coherent

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Message-ID: <DAC123579553F487+1871efee-51e7-4049-8a15-9cf8bd286f03@radxa.com>
Date: Wed, 21 May 2025 22:08:54 +0800
From: Xilin Wu <sophon@...xa.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: cros-qcom-dts-watchers@...omium.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>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7280: Mark FastRPC context banks as
 dma-coherent

On 2025/5/21 05:34:08, Dmitry Baryshkov wrote:
> On Wed, Apr 16, 2025 at 06:54:18PM +0800, Xilin Wu wrote:
>> The FastRPC context banks are DMA-coherent on sc7280 platform. Mark them
>> as such.
>>
>> This allows LLM inferencing on the CDSP using Qualcomm AI Engine Direct
>> SDK on the qcs6490 platform.
>>
>> Signed-off-by: Xilin Wu <sophon@...xa.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sc7280.dtsi | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
> 
> Are context banks coherent on FP5? On Herobrine? Or Nothing Phone?
> 

Hi,

This was tested on an upcoming SBC (Radxa Dragon Q6A) with the Qualcomm 
Linux cdsp firmware. There would be an error in the LLM demo app without 
this patch.

I'm honestly not sure about the devices that you mentioned, since I 
don't have any other sc7280 devices to test.

-- 
Best regards,
Xilin Wu <sophon@...xa.com>