netdev - Re: [PATCH v2 11/12] riscv: dts: starfive: visionfive-v1: Enable gmac and setup phy

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Message-ID: <f05839c0-7a78-4616-bedc-6a876b7f4bb3@collabora.com>
Date: Mon, 30 Oct 2023 00:41:23 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Emil Renner Berthing <kernel@...il.dk>,
 Samin Guo <samin.guo@...rfivetech.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Richard Cochran <richardcochran@...il.com>,
 Giuseppe Cavallaro <peppe.cavallaro@...com>, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 11/12] riscv: dts: starfive: visionfive-v1: Enable gmac
 and setup phy

On 10/29/23 20:45, Andrew Lunn wrote:
> On Sun, Oct 29, 2023 at 06:27:11AM +0200, Cristian Ciocaltea wrote:
>> The StarFive VisionFive V1 SBC has a Motorcomm YT8521 PHY supporting
>> RGMII-ID, but requires manual adjustment of the RX internal delay to
>> work properly.
>>
>> The default RX delay provided by the driver is 1.95 ns, which proves to
>> be too high. Applying a 50% reduction seems to mitigate the issue.
> 
> I'm not so happy this cannot be explained. You are potentially heading
> into horrible backwards compatibility problems with old DT blobs and
> new kernels once this is explained and fixed.

It seems the visionfive-v2 board also required setting some delays, but
unfortunately no details were provided:

0104340a67b1 ("riscv: dts: starfive: visionfive 2: Add configuration of
mac and phy")

Thanks,
Cristian