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Date: Tue, 30 Apr 2024 12:01:15 +0530
From: Varadarajan Narayanan <quic_varada@quicinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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Subject: Re: [PATCH v3 6/7] phy: qcom-qmp-pcie: add support for ipq9574
 gen3x2 PHY
Message-ID: <ZjCQM24T2XIJ6GAR@hu-varada-blr.qualcomm.com>
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On Mon, Apr 29, 2024 at 01:55:32PM +0300, Dmitry Baryshkov wrote:
> On Mon, 29 Apr 2024 at 09:20, Varadarajan Narayanan
> <quic_varada@quicinc.com> wrote:
> >
> > On Wed, Apr 17, 2024 at 12:50:49AM +0300, Dmitry Baryshkov wrote:
> > > On Wed, 17 Apr 2024 at 00:25, Alex G. <mr.nuke.me@gmail.com> wrote:
> > > >
> > > > Hi Dmitry,
> > > >
> > > > On 4/15/24 16:25, mr.nuke.me@gmail.com wrote:
> > > > >
> > > > >
> > > > > On 4/15/24 15:10, Dmitry Baryshkov wrote:
> > > > >> On Mon, 15 Apr 2024 at 21:23, Alexandru Gagniuc <mr.nuke.me@gmail.com>
> > > > >> wrote:
> > > > >>>
> > > > >>> Add support for the gen3x2 PCIe PHY on IPQ9574, ported form downstream
> > > > >>> 5.4 kernel. Only the serdes and pcs_misc tables are new, the others
> > > > >>> being reused from IPQ8074 and IPQ6018 PHYs.
> > > > >>>
> > > > >>> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
> > > > >>> ---
> > > > >>>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c      | 136 +++++++++++++++++-
> > > > >>>   .../phy/qualcomm/phy-qcom-qmp-pcs-pcie-v5.h   |  14 ++
> > > > >>>   2 files changed, 149 insertions(+), 1 deletion(-)
> > > > >>>
> > > > >>
> > > > >> [skipped]
> > > > >>
> > > > >>> @@ -2448,7 +2542,7 @@ static inline void qphy_clrbits(void __iomem
> > > > >>> *base, u32 offset, u32 val)
> > > > >>>
> > > > >>>   /* list of clocks required by phy */
> > > > >>>   static const char * const qmp_pciephy_clk_l[] = {
> > > > >>> -       "aux", "cfg_ahb", "ref", "refgen", "rchng", "phy_aux",
> > > > >>> +       "aux", "cfg_ahb", "ref", "refgen", "rchng", "phy_aux",
> > > > >>> "anoc", "snoc"
> > > > >>
> > > > >> Are the NoC clocks really necessary to drive the PHY? I think they are
> > > > >> usually connected to the controllers, not the PHYs.
> > > > >
> > > > > The system will hang if these clocks are not enabled. They are also
> > > > > attached to the PHY in the QCA 5.4 downstream kernel.
> > >
> > > Interesting.
> > > I see that Varadarajan is converting these clocks into interconnects.
> > > Maybe it's better to wait for those patches to land and use
> > > interconnects instead. I think it would better suit the
> > > infrastructure.
> > >
> > > Varadarajan, could you please comment, are these interconnects
> > > connected to the PHY too or just to the PCIe controller?
> >
> > Sorry for the late response. Missed this e-mail.
> >
> > These 2 clks are related to AXI port clk on Aggnoc/SNOC, not
> > directly connected to PCIE wrapper, but it should be enabled to
> > generate pcie traffic.
>
> So, are they required for the PHY or are they required for the PCIe
> controller only?

These 2 clks are required for PCIe controller only.
PCIE controller need these clks to send/receive axi pkts.

Thanks
Varada

> > > > They are named "anoc_lane", and "snoc_lane" in the downstream kernel.
> > > > Would you like me to use these names instead?
> > >
> > > I'm fine either way.
> > >
>
>
>
> --
> With best wishes
> Dmitry