# Re: \[PATCH v3 6/9\] riscv: dts: starfive: visionfive-v1: Setup ethernet phy

- From: Andrew Lunn \<andrew@lunn.ch\>
- Date: 2023-12-17 17:55:39 
- List: netdev
- Page: https://ratatoskr.run/netdev/2023/12/2437467
- Thread: https://ratatoskr.run/netdev/2023/12/2436442/t.md

```text
On Fri, Dec 15, 2023 at 10:40:45PM +0200, Cristian Ciocaltea wrote:
> The StarFive VisionFive V1 SBC uses 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.
> 
> Also note this adjustment is not necessary on BeagleV Starlight SBC,
> which uses a Microchip PHY.  Hence, there is no indication of a
> miss-behaviour on the GMAC side, but most likely the issue stems from
> the Motorcomm PHY.

I suggest you make a similar comment in the .dts file, just to explain
the odd setting.

	Andrew
```