linux-kernel - Re: [PATCH v3 2/2] arm64: dts: qcom: sa8775p: Remove max link speed property for PCIe EP

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Message-ID: <CAMyL0qPd2HRv4nr2C9=5SgzSkuKO_1cfZbOUO2aUj3vPWnmJbA@mail.gmail.com>
Date: Fri, 30 May 2025 11:08:04 +0530
From: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        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 v3 2/2] arm64: dts: qcom: sa8775p: Remove max link speed
 property for PCIe EP

On Tue, May 27, 2025 at 4:06 PM Konrad Dybcio
<konrad.dybcio@....qualcomm.com> wrote:
>
> On 5/25/25 3:29 PM, Dmitry Baryshkov wrote:
> > On Sun, May 25, 2025 at 11:27:18AM +0530, 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.
> >
> > As Gen4 equalization is already supported by the XYZ driver remove the
> > max-link-speed property.
> >
> > "Add change to remove" is a bit clumsy.
>
> I'm more worried about this node not having these gen4 eq settings
> (i.e. the part talking about driver support landing is true, but it's
> unused without the presets being explicitly defined in eq-presets-16gts)
>
> Konrad

Hi Konrad,

Actually stability issue was resolved by this patch series:
https://lore.kernel.org/linux-pci/20240911-pci-qcom-gen4-stability-v7-3-743f5c1fd027@linaro.org/
and I don't think we need to define eq-presets-16gts for this.

Thanks,
Mrinmay