netdev - Re: [PATCH net-next 0/2] net: mediatek: Add MT7621 TRGMII mode support

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Date:   Mon, 17 Jun 2019 15:19:04 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     René van Dorst <opensource@...rst.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        netdev@...r.kernel.org, john@...ozen.org,
        linux-mediatek@...ts.infradead.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] net: mediatek: Add MT7621 TRGMII mode
 support

On 6/17/19 2:33 PM, René van Dorst wrote:
> Quoting Andrew Lunn <andrew@...n.ch>:
> 
>> On Sun, Jun 16, 2019 at 08:20:08PM +0200, René van Dorst wrote:
>>> Like many other mediatek SOCs, the MT7621 SOC and the internal MT7530
>>> switch both
>>> supports TRGMII mode. MT7621 TRGMII speed is 1200MBit.
>>
>> Hi René
>>
> 
> Hi Andrew,
> 
>> Is TRGMII used only between the SoC and the Switch? Or does external
>> ports of the switch also support 1200Mbit/s? If external ports support
>> this, what does ethtool show for Speed?
> 
> Only the first GMAC of the SOC and port 6 of the switch supports this mode.
> The switch can be internal in the SOC but also a separate chip.
> 
> PHYLINK and ethertool reports the link as 1Gbit.
> The link is fixed-link with speed = 1000.
> 
> dmesg output with unposted PHYLINK patches:
> [    5.236763] mt7530 mdio-bus:1f: configuring for fixed/trgmii link mode
> [    5.249813] mt7530 mdio-bus:1f: phylink_mac_config:
> mode=fixed/trgmii/1Gbps/Full adv=00,00000000,00000220 pause=12 link=1 an=1
> [    6.389435] mtk_soc_eth 1e100000.ethernet eth0: phylink_mac_config:
> mode=fixed/trgmii/1Gbps/Full adv=00,00000000,00000220 pause=12 link=1 an=1
> 
> # ethtool eth0
> Settings for eth0:
>          Supported ports: [ MII ]
>          Supported link modes:   1000baseT/Full
>          Supported pause frame use: No
>          Supports auto-negotiation: No
>          Supported FEC modes: Not reported
>          Advertised link modes:  1000baseT/Full
>          Advertised pause frame use: No
>          Advertised auto-negotiation: No
>          Advertised FEC modes: Not reported
>          Speed: 1000Mb/s
>          Duplex: Full
>          Port: MII
>          PHYAD: 0
>          Transceiver: internal
>          Auto-negotiation: on
>          Current message level: 0x000000ff (255)
>                                 drv probe link timer ifdown ifup rx_err
> tx_err
>          Link detected: yes
> 
> 
> 
> I already have report from a MT7623 user that this patch gives issues.
> 
> I send v2 of the patch if I fixed that issue.
> 
> Also I think it is better to add a XTAL frequency check.
> The PLL values are only valid with a 40MHz crystal.
> 
> Any other comments for v2?

Looks good to me otherwise.
-- 
Florian