netdev - Re: [PATCH 0/3]: net: dsa: mt7530: support MT7530 in the MT7621 SoC

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Date:   Fri, 30 Nov 2018 11:30:07 +0000
From:   René van Dorst <opensource@...rst.com>
To:     gerg@...nel.org
Cc:     sean.wang@...iatek.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, blogic@...nwrt.org, neil@...wn.name,
        bjorn@...k.no
Subject: Re: [PATCH 0/3]: net: dsa: mt7530: support MT7530 in the MT7621 SoC

Quoting gerg@...nel.org:

> I have been working towards supporting the MT7530 switch as used in the
> MediaTek MT7621 SoC. Unlike the MediaTek MT7623 the MT7621 is built around
> a dual core MIPS CPU architecture. But underneath it is what appears to
> be the same 7530 switch.
>
> The following 3 patches are more of an RFC than anything. They allow
> use of the mt7530 dsa driver on this device - though with some issues
> still to resolve. The primary change required is to not use the 7623
> specific clock and regulator setup - none of that applies when using
> the 7621 (and maybe other devices?). The other change required is to
> set the 7530 MFC register CPU port number and enable bit.

Hi Greg,

Good to see that more people are working on the MT7621 device [1].
So I added Bjorn to the CC.

I am also working on this but on the OpenWRT side.
My current code works for a Ubiquiti EdgeRouter X SFP. See kernel [2],  
openwrt [3]

Current status:

Using OpenWRT provided mainline v4.14 driver MT7530 and MT7623.
I patches so that MT7621 is supported.
This means DSA part is also working, internal and external phys are detected.
I can use all of the five RJ45 ports and also MT7520 switch port 5  
which connects to a external phy (at8033) for the SFP port.
Last added TRGMII part also seems to work but with issues, see below.
Openwrt uses port 5 as wan and gets a dhcp lease.

Issues:
- I can't get 2nd GMAC talk to external phy. I have tried many many  
knobs but without success.
   GMAC seems to work but no data is transmitted/received over the cable.
   But I think this can be done later on. Adding basic support for  
MT7621 is good start.
- Ethernet driver expects that the macs are initialized so that the  
mtk_hw_init can setup the hardware registers.
   But they are not. See [4]
   I don't know how to fix this. For the current code it is not an  
issue. It still works.
   But it should be fixed.
   Because of this I can't read the mac0 "phy-mode". I need this info  
to setup the tgrmii clock at hardware init.
- Ethernet speed is unstable ~30-100mbit. I think I broke something. I  
have seems 1gbit before.

I hope that this can help you the get a step further.

Greats,

René

[1] https://lists.openwrt.org/pipermail/openwrt-devel/2018-August/013614.html
[2] https://github.com/vDorst/linux-1/commits/mt7621-dsa-trgmii
[3] https://github.com/vDorst/openwrt/commits/mt7621-dsa-trgmii
[4]  
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/ethernet/mediatek/mtk_eth_soc.c?h=v4.14.84#n1946