netdev - Re: [PATCH net-next 00/15] Realtek RTL822x PHY rework to c45 and SerDes interface switching

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Date: Sat, 23 Dec 2023 20:09:33 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Marek Behún <kabel@...nel.org>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Russell King <rmk+kernel@...linux.org.uk>,
 Alexander Couzens <lynxis@...0.eu>, Daniel Golle <daniel@...rotopia.org>,
 Willy Liu <willy.liu@...ltek.com>, Ioana Ciornei <ioana.ciornei@....com>,
 Marek Mojík <marek.mojik@....cz>,
 Maximilián Maliar <maximilian.maliar@....cz>
Subject: Re: [PATCH net-next 00/15] Realtek RTL822x PHY rework to c45 and
 SerDes interface switching

On 20.12.2023 17:25, Marek Behún wrote:
> On Wed, 20 Dec 2023 17:20:07 +0100
> Heiner Kallweit <hkallweit1@...il.com> wrote:
> 
>> On 20.12.2023 16:55, Marek Behún wrote:
>>> Hi,
>>>
>>> this series reworks the realtek PHY driver's support for rtl822x
>>> 2.5G transceivers:
>>>
>>> - First I change the driver so that the high level driver methods
>>>   only use clause 45 register accesses (the only clause 22 accesses
>>>   are left when accessing c45 registers indirectly, if the MDIO bus
>>>   does not support clause 45 accesses).
>>>   The driver starts using the genphy_c45_* methods.
>>>
>>>   At this point the driver is ready to be used on a MDIO bus capable
>>>   of only clause 45 accesses, but will still work on clause 22 only
>>>   MDIO bus.
>>>
>>> - I then add support for SerDes mode switching between 2500base-x
>>>   and sgmii, based on autonegotiated copper speed.
>>>
>>> All this is done so that we can support another 2.5G copper SFP
>>> module, which is enabled by the last patch.
>>>   
>>
>> Has been verified that the RTL8125-integrated PHY's still work
>> properly with this patch set?
>>
> 
> Hi Heiner,
> 
> no, I wanted to send you an email to test this. I do not have the
> controllers with integrates PHYs.
> 
> Can you test this?
> 
> Also do you have a controller where the rtlgen driver is used but it
> only supports 1gbps ? I.e. where the PHY ID is RTL_GENERIC_PHYID
> (0x001cc800).
> 
> I am asking because I am told that it also is clause 45, so the drivers
> can potentially be merged completely (the rtl822x_ functions can be
> merged with rtlgen_ functions and everything rewritten to clause 45,
> and gentphy_c45_ functions can be used).
> 
At least on RTL8168h indirect MMD reads return 0 always.
IIRC this was the reason why the rtlgen functions use the vendor-specific
registers.

> Marek