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

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Message-ID: <1f98f83f-328f-47c8-84e7-2c77abb37a6a@oss.qualcomm.com>
Date: Fri, 24 Oct 2025 10:10:05 +0800
From: Jingyi Wang <jingyi.wang@....qualcomm.com>
To: Krzysztof Kozlowski <k.kozlowski.k@...il.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 10/23/2025 2:28 PM, Krzysztof Kozlowski wrote:
> On 23/10/2025 06:07, Jingyi Wang wrote:
>>
>>
>> On 10/9/2025 6:29 PM, Krzysztof Kozlowski wrote:
>>> On 29/09/2025 19:03, Dmitry Baryshkov wrote:
>>>> On Mon, Sep 29, 2025 at 05:41:10PM +0800, Jingyi Wang wrote:
>>>>>
>>>>>
>>>>> On 9/29/2025 5:34 PM, Dmitry Baryshkov wrote:
>>>>>> On Mon, Sep 29, 2025 at 02:20:54PM +0800, Jingyi Wang wrote:
>>>>>>>
>>>>>>>
>>>>>>> On 9/25/2025 9:48 AM, Krzysztof Kozłowski wrote:
>>>>>>>> On Thu, 25 Sept 2025 at 08:37, Jingyi Wang <jingyi.wang@....qualcomm.com> wrote:
>>>>>>>>>
>>>>>>>>> Add remote processor PAS loader for Kaanapali CDSP processor, compatible
>>>>>>>>> with earlier SM8550 with minor difference: one more sixth "shutdown-ack"
>>>>>>>>> interrupt.
>>>>>>>>>
>>>>>>>>> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>>>>>>>>> ---
>>>>>>>>>  .../bindings/remoteproc/qcom,sm8550-pas.yaml          | 19 +++++++++++++++++++
>>>>>>>>>  1 file changed, 19 insertions(+)
>>>>>>>>>
>>>>>>>>> diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,sm8550-pas.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,sm8550-pas.yaml
>>>>>>>>> index be9e2a0bc060..031fdf36a66c 100644
>>>>>>>>> --- a/Documentation/devicetree/bindings/remoteproc/qcom,sm8550-pas.yaml
>>>>>>>>> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,sm8550-pas.yaml
>>>>>>>>> @@ -35,6 +35,9 @@ properties:
>>>>>>>>>        - items:
>>>>>>>>>            - const: qcom,sm8750-cdsp-pas
>>>>>>>>>            - const: qcom,sm8650-cdsp-pas
>>>>>>>>> +      - items:
>>>>>>>>> +          - const: qcom,kaanapali-cdsp-pas
>>>>>>>>> +          - const: qcom,sm8550-cdsp-pas
>>>>>>>>
>>>>>>>>
>>>>>>>> This time maybe without HTML:
>>>>>>>>
>>>>>>>> This looks wrong. This is not compatible with SM8550.
>>>>>>>
>>>>>>> Could you point out what is the difference from your perspecetive?
>>>>>>> it is the same as SM8550 except for there is one more interrupt,
>>>>>>> which is also described in this patch.
>>>>>>
>>>>>> I'd second Krzysztof here. Your description points out that it is _not_
>>>>>> compatible to SM8550.
>>>>>>
>>>>>
>>>>> Here is the binding for sm8750 cdsp. Fallback to sm8650 but describe the
>>>>> difference in interrupt:
>>>>> https://lore.kernel.org/all/20250221160036.159557-1-krzysztof.kozlowski@linaro.org/
>>>>
>>>> Interesting. Let's wait for Krzysztof's response then.
>>>>
>>>
>>>
>>> Because it is evolution of sm8750, so it did not go back to old design.
>>> from three generations ago. This is compatible with sm8750 or with sm8650.
>>>
>>>
>>> Best regards,
>>> Krzysztof
>>
>> 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.

Thanks,
Jingyi