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

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Message-ID: <qemlydifa7u3zwrjnnp7umjsprjrje27ghzghyyoutufeyiimn@g2ejdt72opz3>
Date: Thu, 31 Jul 2025 19:39:43 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Krzysztof Kozlowski <krzk@...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 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.

- Mani

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