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: <CAMyL0qPH2r8oXOrNp3jF-nBJCRCZzJr8rYrHn+Yp0MHR0Wy-vw@mail.gmail.com>
Date: Fri, 16 May 2025 15:59:02 +0530
From: Mrinmay Sarkar <mrinmay.sarkar@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: 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 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

> Konrad

Mrinmay