linux-kernel - Re: [PATCH 0/2] phy: qcom-qmp-pcie: Add support to keep refclk always on

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Date:   Mon, 6 Nov 2023 13:58:04 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_ramkri@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_vpernami@...cinc.com, quic_parass@...cinc.com
Subject: Re: [PATCH 0/2] phy: qcom-qmp-pcie: Add support to keep refclk always on

On Mon, 6 Nov 2023 at 13:53, Krishna chaitanya chundru
<quic_krichai@...cinc.com> wrote:
>
> This series adds support to provide refclk to endpoint even in low
> power states.
>
> Due to some platform specific issues with CLKREQ signal, it is not being
> propagated to the host and as host doesn't know the clkreq signal host is
> not sending refclk. Due to this endpoint is seeing linkdown and going
> to bad state.

Is this a board issue or an SoC issue? In the latter case this should
go to the PHY configuration structure instead of being specified in
the DT.

> To avoid those ref clk should be provided always to the endpoint. The
> issue is coming only when ep intiates the L1.1 or L1.2 exit and clkreq
> is not being propagated properly to the host.
>
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
> Krishna chaitanya chundru (2):
>       dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property
>       phy: qcom-qmp-pcie: Add support for keeping refclk always on
>
>  .../bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml    |  5 +++++
>  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c            | 21 +++++++++++++++++----
>  2 files changed, 22 insertions(+), 4 deletions(-)
> ---
> base-commit: 71e68e182e382e951d6248bccc3c960dcec5a718
> change-id: 20231106-refclk_always_on-9beae8297cb8
>
> Best regards,
> --
> Krishna chaitanya chundru <quic_krichai@...cinc.com>
>


-- 
With best wishes
Dmitry