linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: msm8996: Add missing UFS host controller reset

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Message-ID: <20240403135015.GN25309@thinkpad>
Date: Wed, 3 Apr 2024 19:20:15 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Avri Altman <avri.altman@....com>,
	Bart Van Assche <bvanassche@....org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
	Andy Gross <andy.gross@...aro.org>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: qcom: msm8996: Add missing UFS host
 controller reset

On Tue, Apr 02, 2024 at 10:25:32PM +0300, Dmitry Baryshkov wrote:
> On Tue, 2 Apr 2024 at 20:35, Bjorn Andersson <andersson@...nel.org> wrote:
> >
> > On Fri, Feb 09, 2024 at 10:16:25PM +0200, Dmitry Baryshkov wrote:
> > > On Tue, 30 Jan 2024 at 08:55, Manivannan Sadhasivam
> > > <manivannan.sadhasivam@...aro.org> wrote:
> > > >
> > > > On Mon, Jan 29, 2024 at 11:44:15AM +0200, Dmitry Baryshkov wrote:
> > > > > On Mon, 29 Jan 2024 at 09:55, Manivannan Sadhasivam
> > > > > <manivannan.sadhasivam@...aro.org> wrote:
> > > > > >
> > > > > > UFS host controller reset is required for the drivers to properly reset the
> > > > > > controller. Hence, add it.
> > > > > >
> > > > > > Fixes: 57fc67ef0d35 ("arm64: dts: qcom: msm8996: Add ufs related nodes")
> > > > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > > >
> > > > > I think I had issues previously when I attempted to reset the
> > > > > controller, but it might be because of the incomplete clocks
> > > > > programming. Let met check whether it works first.
> > > > >
> > > >
> > > > Sure. Please let me know.
> > >
> > > With the clocking fixes in place (I'll send them in a few minutes) and
> > > with this patch the UFS breaks in the following way:
> > >
> >
> > Was this further reviewed/investigated? What would you like me to do
> > with this patch?
> 
> I'd say, hold until we can understand what is going on.
> 
> Mani, If you have any ideas what can be causing the issue, I'm open to
> testing any ideas or any patches from your side.
> Judging that the UFS breaks after toggling the reset, we might be
> missing some setup steps.
> 

I've bombarded the Qcom UFS team with too many questions, but didn't get answer
for all of them. And this is one of those questions.

Let me try to dig further and come back.

- Mani

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