linux-kernel - Re: [V3] PCI: fu740: Drop to 2.5GT/s to fix initial device probing on some boards

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Message-ID: <alpine.DEB.2.21.2205020049130.9383@angie.orcam.me.uk>
Date:   Mon, 2 May 2022 12:46:11 +0100 (BST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
cc:     Alexandre Ghiti <alex@...ti.fr>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        David Abdurachmanov <david.abdurachmanov@...ive.com>,
        Neill Whillans <neill.whillans@...ethink.co.uk>
Subject: Re: [V3] PCI: fu740: Drop to 2.5GT/s to fix initial device probing
 on some boards

Hi Ben,

> >   Any idea what might be causing it?  I can't see it being explicitly set
> > or cleared anywhere, be it in U-Boot or Linux, so it must be done by the
> > device itself depending on something.  And the lack of this capability
> > seems to me like non-compliance for a multiple-lane, multiple-speed
> > device.
> 
> I'll see if we can reproduce this

 Have you been able to look into it?

  Maciej