linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p: Remove max link speed property for PCIe EP

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Message-ID: <bpc4tsp4kghqohoxm42qls7gzd5me7xrpodmazyhpvjjlkkay2@paoq5zygczdd>
Date: Sat, 17 May 2025 01:03:20 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, krishna.chundru@....qualcomm.com,
        quic_vbadigan@...cinc.com, quic_nayiluri@...cinc.com,
        quic_ramkri@...cinc.com, quic_nitegupt@...cinc.com,
        Mrinmay Sarkar <quic_msarkar@...cinc.com>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p: Remove max link speed
 property for PCIe EP

On Fri, May 16, 2025 at 03:59:02PM +0530, Mrinmay Sarkar wrote:
> On Fri, May 16, 2025 at 2:30 PM Konrad Dybcio
> <konrad.dybcio@....qualcomm.com> wrote:
> >
> > On 5/14/25 6:38 PM, neil.armstrong@...aro.org wrote:
> > > On 14/05/2025 13:37, Mrinmay Sarkar wrote:
> > >> From: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
> > >>
> > >> The maximum link speed was previously restricted to Gen3 due to the
> > >> absence of Gen4 equalization support in the driver.
> > >>
> > >> Add change to remove max link speed property, Since Gen4 equalization
> > >> support has already been added into the driver.
> > >
> > > Which driver, PHY or Controller ?
> >
> > Controller, see
> >
> > 09483959e34d ("PCI: dwc: Add support for configuring lane equalization presets")
> 
> Yes, this patch is helping to solve gen4 stability issue.
> >
> > and commits around it
> >
> > does this change depends on the patch 1 PHY settings update ?
> >
> > That I'm curious about too, but I would guesstimate no
> >
> this change doesn't depends on the patch 1 PHY settings update

Then what has changed, as previously it was documented to have stability
issues.

-- 
With best wishes
Dmitry