linux-kernel - Re: [PATCH 0/2] dt-bindings: ufs: qcom: Split SC7280 and similar into separate file

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Message-ID: <a8eb1574-39f2-4b71-b6be-bb28b43eb6f8@kernel.org>
Date: Thu, 31 Jul 2025 16:53:41 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Nitin Rawat <quic_nitirawa@...cinc.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
 Bart Van Assche <bvanassche@....org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-scsi@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
Subject: Re: [PATCH 0/2] dt-bindings: ufs: qcom: Split SC7280 and similar into
 separate file

On 31/07/2025 16:09, Manivannan Sadhasivam wrote:
> On Thu, Jul 31, 2025 at 09:04:48AM GMT, Krzysztof Kozlowski wrote:
>> On 31/07/2025 08:59, Nitin Rawat wrote:
>>>> Hm?
>>>>
>>>>>
>>>>> For reference, only SM8650 and SM8750 currently support MCQ, though more
>>>>> targets may be added later.
>>>>
>>>> Are you sure? Are you claiming that SM8550 hardware does not support MCQ?
>>>
>>> Offcourse I can say that because I am working on Qualcomm UFS Driver.
>>
>> Qualcomm sent many patches which were not related to hardware at all,
>> just based on drivers, so my question is completely valid based on
>> previous experience with Qualcomm.
>>
> 
> SM8550 indeed doesn't support MCQ. Even though it is based on UFSHCD 4.x, it
> doesn't support MCQ due to hardware design. MCQ support only starts from SM8650.

Yeah, I checked later in datasheets and programming guide. That's why I
sent v2 and marked it in Patchwork as changes-requested.

Best regards,
Krzysztof