netdev - Re: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib support

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Message-ID: <460f971e-fbae-8d3d-ae8e-ed90bbebda4d@samsung.com>
Date:   Fri, 18 Jun 2021 12:45:41 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib
 support

Hi Oleksij,

On 18.06.2021 12:13, Oleksij Rempel wrote:
> thank you for your feedback.
>
> On Fri, Jun 18, 2021 at 10:39:12AM +0200, Marek Szyprowski wrote:
>> On 07.06.2021 10:27, Oleksij Rempel wrote:
>>> To be able to use ax88772 with external PHYs and use advantage of
>>> existing PHY drivers, we need to port at least ax88772 part of asix
>>> driver to the phylib framework.
>>>
>>> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
>> I found one more issue with this patch. On one of my test boards
>> (Samsung Exynos5250 SoC based Arndale) system fails to establish network
>> connection just after starting the kernel when the driver is build-in.
>>
>> --->8---
>> # dmesg | grep asix
>> [    2.761928] usbcore: registered new interface driver asix
>> [    5.003110] asix 1-3.2.4:1.0 (unnamed net_device) (uninitialized):
>> invalid hw address, using random
>> [    6.065400] asix 1-3.2.4:1.0 eth0: register 'asix' at
>> usb-12110000.usb-3.2.4, ASIX AX88772 USB 2.0 Ethernet, 7a:9b:9a:f2:94:8e
>> [   14.043868] asix 1-3.2.4:1.0 eth0: Link is Up - 100Mbps/Full - flow
>> control off
>> # ping -c2  host
>> PING host (192.168.100.1) 56(84) bytes of data.
>>   From 192.168.100.20 icmp_seq=1 Destination Host Unreachable
>>   From 192.168.100.20 icmp_seq=2 Destination Host Unreachable
>>
>> --- host ping statistics ---
>> 2 packets transmitted, 0 received, +2 errors, 100% packet loss, time 59ms
>> --->8---
> Hm... it looks like different chip variant. My is registered as
> "ASIX AX88772B USB", yours is "ASIX AX88772 USB 2.0" - "B" is the
> difference. Can you please tell me more about this adapter and if possible open
> tell the real part name.
Well, currently I have only remote access to that board. The network 
chip is soldered on board. Maybe you can read something from the photo 
on the wiki page: https://en.wikipedia.org/wiki/Arndale_Board
> I can imagine that this adapter may using generic PHY driver.
> Can you please confirm it by dmesg | grep PHY?
> In my case i'll get:
> Asix Electronics AX88772C usb-001:003:10: attached PHY driver (mii_bus:phy_addr=usb-001:003:10, irq=POLL)
# dmesg | grep PHY
[    5.700274] Asix Electronics AX88772A usb-001:004:10: attached PHY 
driver (mii_bus:phy_addr=usb-001:004:10, irq=POLL)
> If you have a different PHY, can you please send me the PHY id:
> cat /sys/bus/mdio_bus/devices/usb-001\:003\:10/phy_id
>
> Your usb path will probably be different.

# cat /sys/bus/mdio_bus/devices/usb-001\:004\:10/phy_id
0x003b1861

 > ...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland