linux-kernel - Re: [PATCH v4 1/3] PCI: qcom: Enable cache coherency for SA8775P RC

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Message-ID: <CAA8EJprOwxFUk_=uE+5788+N5bSKTMa1=t77nRWVu9M7xnjJ3w@mail.gmail.com>
Date:   Tue, 21 Nov 2023 20:40:23 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Mrinmay Sarkar <quic_msarkar@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        konrad.dybcio@...aro.org, mani@...nel.org, robh+dt@...nel.org,
        quic_shazhuss@...cinc.com, quic_nitegupt@...cinc.com,
        quic_ramkri@...cinc.com, quic_nayiluri@...cinc.com,
        robh@...nel.org, quic_krichai@...cinc.com,
        quic_vbadigan@...cinc.com, quic_parass@...cinc.com,
        quic_schintav@...cinc.com, quic_shijjose@...cinc.com,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 1/3] PCI: qcom: Enable cache coherency for SA8775P RC

On Tue, 21 Nov 2023 at 16:38, Mrinmay Sarkar <quic_msarkar@...cinc.com> wrote:
>
> In a multiprocessor system cache snooping maintains the consistency
> of caches. Snooping logic is disabled from HW on this platform.
> Cache coherency doesn’t work without enabling this logic.
>
> 8775 has IP version 1.34.0 so intruduce a new cfg(cfg_1_34_0) for this
> platform. Assign no_snoop_override flag into struct qcom_pcie_cfg and
> set it true in cfg_1_34_0 and enable cache snooping if this particular
> flag is true.

Thank you!

>
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>



-- 
With best wishes
Dmitry