Re: [PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

[Andrew Lunn <andrew@lunn.ch>]

On Tue, Oct 22, 2024 at 06:21:49PM +0800, Inochi Amaoto wrote:
> On Mon, Oct 21, 2024 at 03:27:18PM +0200, Andrew Lunn wrote:
> > > It is related to the RGMII delay. On sg2044, when the phy 
> > > sets rx-delay, the interal mac is not set the same delay, 
> > > so this is needed to be set.
> > 
> > This is the wrong way to do it. Please look at how phy-mode should be
> > used, the four different "rgmii" values. Nearly everybody gets this
> > wrong, so there are plenty of emails from me in the netdev list about
> > how it should be done.
> > 
> 
> The phy-mode is alreay set to the "rgmii-id" and a rx delay is already
> set (a default tx delay is set by the phy driver). In the scenario 
> the extra bit is used to fix 2ns difference between the sampling clock
> and data. It is more like an extra setting and the kernel can not handle
> it by only setting the phy-mode.

This sounds wrong.

So in DT you have rgmii-id? You say the PHY is doing TX delay. So you
pass PHY_INTERFACE_MODE_RGMII_TXID to the PHY? It is not clear from
this patch, i don't see any code mentioning
PHY_INTERFACE_MODE_RGMII_TXID. Could you point me at that code.

	Andrew