linux-kernel - Re: [PATCH v2 1/3] arm64: dts: qcom: sc7280: Add memory region for audiopd

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Message-ID: <ab706b24-1dab-4fc0-9e37-fa1ecbd97fda@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 15:33:36 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Ling Xu <quic_lxu5@...cinc.com>, 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 1/3] arm64: dts: qcom: sc7280: Add memory region for
 audiopd

On 27/06/2025 15:16, Srinivas Kandagatla wrote:
> On 5/22/25 7:51 PM, Dmitry Baryshkov wrote:
>> On Thu, May 22, 2025 at 08:27:40PM +0200, Konrad Dybcio wrote:
>>> On 5/22/25 2:16 PM, Dmitry Baryshkov wrote:
>>>> On Thu, 22 May 2025 at 13:44, Ling Xu <quic_lxu5@...cinc.com> wrote:
>>>>>
>>>>> 在 5/20/2025 9:53 PM, Dmitry Baryshkov 写道:
>>>>>> On Tue, May 20, 2025 at 02:41:22PM +0800, Ling Xu wrote:
>>>>>>> 在 5/17/2025 5:47 AM, Dmitry Baryshkov 写道:
>>>>>>>> On Fri, May 16, 2025 at 04:30:27PM +0530, Ling Xu wrote:
>>>>>>>>> Add reserved memory region and VMIDs for audio PD dynamic loading and
>>>>>>>>> remote heap memory requirements.
>>>>>>>>
>>>>>>>> Why? Was it not working without this heap?
>>>>>>>
>>>>>>> yes, it will not working without this heap.
>>>>>>> Memory region is required for audio PD for dynamic loading and remote heap memory
>>>>>>> requirements. For more info, please refer below patches, it has provided a more
>>>>>>> detailed explanation.
>>>>>>> https://lore.kernel.org/all/bb68da04-ef52-4172-8b6e-f4027bcc2786@oss.qualcomm.com/
>>>>>>> https://lore.kernel.org/all/effea02f-6ffb-42e9-87df-081caafab728@oss.qualcomm.com/
>>>>>>
>>>>>> This triggers a bunch of questions:
>>>>>>
>>>>>> - What is audio PD?
>>>>>>
>>>>> Audio PD is a protection domain which is running on DSP for audio
>>>>> specific processing.
>>>>>> - Is it a required component?
>>>>> yes. it is needed wherever there is some audio use cases where
>>>>> DSP audio PD dynamic loading is needed.
>>>>
>>>> Which use cases?
>>>>
> 
> Usecase is for audio compress offload, ex: when we play mp3 or any other
> compress format, we need audio pd support.

This needs to be in the commit message.


-- 
With best wishes
Dmitry