linux-kernel - Re: [PATCH 2/6] dt-bindings: remoteproc: qcom,sm8550-pas: Add Kaanapali CDSP

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Message-ID: <d19785f7-6b1a-4f3a-841b-dc737c7b7e5c@gmail.com>
Date: Fri, 24 Oct 2025 09:45:44 +0200
From: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
To: Jingyi Wang <jingyi.wang@....qualcomm.com>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, aiqun.yu@....qualcomm.com,
 tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
 yijie.yang@....qualcomm.com
Subject: Re: [PATCH 2/6] dt-bindings: remoteproc: qcom,sm8550-pas: Add
 Kaanapali CDSP

On 24/10/2025 09:42, Jingyi Wang wrote:
> 
> 
> On 10/24/2025 3:28 PM, Krzysztof Kozlowski wrote:
>> On 24/10/2025 04:10, Jingyi Wang wrote:
>>>>>
>>>>> Hi Krzysztof，
>>>>>
>>>>> I tested with falling back to sm8650 cdsp but it will fail with:
>>>>> [    4.739615] qcom_q6v5_pas 26300000.remoteproc: unable to resolve shareable memory-region index 0
>>>>>
>>>>> sm8550 and kaanapali define 2 memory regions: 
>>>>> "memory-region = <&cdsp_mem>, <&q6_cdsp_dtb_mem>;"
>>>>>
>>>>> sm8650 and sm8750 define 3 memory regions:
>>>>> "memory-region = <&cdsp_mem>, <&q6_cdsp_dtb_mem>, <&global_sync_mem>;"
>>>>> with the driver:
>>>>>
>>>>> static const struct qcom_pas_data sm8650_cdsp_resource = {
>>>>>         .crash_reason_smem = 601,
>>>>>         .firmware_name = "cdsp.mdt",
>>>>>         .dtb_firmware_name = "cdsp_dtb.mdt",
>>>>>          <...>
>>>>>         .region_assign_idx = 2,
>>>>>         .region_assign_count = 1,
>>>>>         .region_assign_shared = true,
>>>>>         .region_assign_vmid = QCOM_SCM_VMID_CDSP,
>>>>> };
>>>>>
>>>>> When kaanapali fallback to sm8650 it cannot parse this region_assign_idx.
>>>>>
>>>>> So shall we still fallback to sm8550 or define a new node "kaanapali_cdsp_resource"
>>>>> in the driver?
>>>>
>>>> And partially the point here is that you might need the third region, no?
>>>> Best regards,
>>>> Krzysztof
>>>
>>> On kaanapali, the global_sync_mem region is not managed by kernel, so it should
>>> be removed.
>>
>>
>> OK, then please mention this in the commit msg, so it is clear why this
>> is not compatible with previous generation.
>>
>> Best regards,
>> Krzysztof
> 
> Sorry for being a bit verbose, but I would like to make it clear that we can still
> use this fallback if we clarify it in the commit message, right?


Yes, you can.

Best regards,
Krzysztof