linux-kernel - Re: [PATCH V2 1/3] scsi: ufs: dt-bindings: Document UFS Disable LPM property

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Message-ID: <34kz7pj7bjbmpfyrlwf2u4vikrbbmga5mxv2i7x3zga57qysg7@oou3m2rbazdb>
Date: Mon, 12 May 2025 19:00:00 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Pavan Kondeti <pavan.kondeti@....qualcomm.com>
Cc: Nitin Rawat <quic_nitirawa@...cinc.com>,
        Krzysztof Kozlowski <krzk@...nel.org>, alim.akhtar@...sung.com,
        avri.altman@....com, bvanassche@....org, krzk+dt@...nel.org,
        robh@...nel.org, mani@...nel.org, conor+dt@...nel.org,
        James.Bottomley@...senpartnership.com, martin.petersen@...cle.com,
        beanhuo@...ron.com, peter.wang@...iatek.com,
        linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V2 1/3] scsi: ufs: dt-bindings: Document UFS Disable LPM
 property

On Mon, May 12, 2025 at 01:11:08PM +0530, Pavan Kondeti wrote:
> On Mon, May 12, 2025 at 09:45:49AM +0530, Nitin Rawat wrote:
> > 
> > 
> > On 5/7/2025 8:34 PM, Nitin Rawat wrote:
> > > 
> > > 
> > > On 5/6/2025 11:46 PM, Krzysztof Kozlowski wrote:
> > > > On 06/05/2025 18:37, Nitin Rawat wrote:
> > > > > Disable UFS low power mode on emulation FPGA platforms or other
> > > > > platforms
> > > > 
> > > > Why wouldn't you like to test LPM also on FPGA designs? I do not see
> > > > here correlation.
> > > 
> > > Hi Krzysztof,
> > > 
> > > Since the FPGA platform doesn't support UFS Low Power Modes (such as the
> > > AutoHibern8 feature specified in the UFS specification), I have included
> > > this information in the hardware description (i.e dts).
> > 
> > 
> > Hi Krzysztof,
> > 
> > Could you please share your thoughts on my above comment? If you still see
> > concerns, I may need to consider other options like modparam.
> > 
> 
> I understand why you are inclining towards the module param here. Before
> we take that route,
> 
> Is it possible to use a different compatible (for ex: qcom,sm8650-emu-ufshc) for UFS controller
> on the emulation platform and apply the quirk in the driver based on the device_get_match_data()
> based detection?

Emulation platforms are generally not visible and not supported by the
upstream Linux kernel. During the bringup stage you can apply any kind
of quirks, but I don't think that FPGA or emulation are of concern to
the upstream kernel.

-- 
With best wishes
Dmitry