lkml.org 
[lkml]   [2023]   [Oct]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2 11/12] riscv: dts: starfive: visionfive-v1: Enable gmac and setup phy
From
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

\
 
 \ /
  Last update: 2023-10-29 23:43    [W:0.066 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site