From: Ben Dooks <ben.dooks@codethink.co.uk>
To: "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc: Alexandre Ghiti <alex@ghiti.fr>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org,
Bjorn Helgaas <bhelgaas@google.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Rob Herring <robh@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Greentime Hu <greentime.hu@sifive.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
David Abdurachmanov <david.abdurachmanov@sifive.com>,
Neill Whillans <neill.whillans@codethink.co.uk>
Subject: Re: [V3] PCI: fu740: Drop to 2.5GT/s to fix initial device probing on some boards
Date: Sun, 29 May 2022 16:56:44 +0100 [thread overview]
Message-ID: <ddc1462c-be74-420a-6809-c868fa056fa7@codethink.co.uk> (raw)
In-Reply-To: <alpine.DEB.2.21.2205020049130.9383@angie.orcam.me.uk>
On 02/05/2022 12:46, Maciej W. Rozycki wrote:
> 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?
>
I can't see anything obvious from the code, however my SD card image
does not have lspci on it and I have not had time to make a new image
to test.
I wonder if anyone at SiFive can comment on this?
--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius
https://www.codethink.co.uk/privacy.html
next prev parent reply other threads:[~2022-05-29 16:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-18 15:24 [V3] PCI: fu740: Drop to 2.5GT/s to fix initial device probing on some boards Ben Dooks
2022-03-18 23:03 ` Palmer Dabbelt
2022-03-19 12:40 ` Ben Dooks
2022-03-21 13:49 ` Alexandre Ghiti
2022-03-23 10:36 ` Alexandre Ghiti
2022-03-23 10:40 ` Ben Dooks
2022-04-14 0:10 ` Maciej W. Rozycki
2022-04-14 7:11 ` Ben Dooks
2022-05-02 11:46 ` Maciej W. Rozycki
2022-05-29 15:56 ` Ben Dooks [this message]
2022-03-21 20:29 ` Bjorn Helgaas
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