netdev - RE: [PATCH RFC 0/3] net: phy: marvell10g: Add host speed setting by an ethernet driver

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Date:   Thu, 20 Oct 2022 01:04:08 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Marek Behún <kabel@...nel.org>
CC:     "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH RFC 0/3] net: phy: marvell10g: Add host speed setting by
 an ethernet driver

Hi Marek,

> From: Marek Behún, Sent: Wednesday, October 19, 2022 7:45 PM
> 
> On Wed, 19 Oct 2022 17:50:49 +0900
> Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> wrote:
> 
> > R-Car S4-8 environment board requires to change the host interface
> > as SGMII and the host speed as 1000 Mbps because the strap pin was
> > other mode, but the SoC/board cannot work on that mode. Also, after
> > the SoC initialized the SERDES once, we cannot re-initialized it
> > because the initialized procedure seems all black magic...
> 
> Can you tell us which exact mode is configured by the strapping pins?

Sure. The port 0 is:

CONFIG[0] = 0 0 0
CONFIG[1] = 0 1 0
CONFIG[2] = 0 1 0

So, MACTYPE is SXGMII.

> Isn't it sufficient to just set the MACTYPE to SGMII, without
> configuring speed?

If the host speed was not changed, my environment didn't work.
The SERDES of R-Car cannot linkup with the PHY.

Best regards,
Yoshihiro Shimoda

> Marek