RE: [RESEND PATCH net-next v4 0/3] Enable 2.5Gbps speed for stmmac

Vladimir,

-----Original Message-----
From: Vladimir Oltean <olteanv@gmail.com>
Sent: Thursday, June 3, 2021 9:28 PM
To: Russell King (Oracle) <linux@armlinux.org.uk>
Cc: Sit, Michael Wei Hong <redacted>;
Jose.Abreu@synopsys.com; andrew@lunn.ch;
hkallweit1@gmail.com; kuba@kernel.org;
netdev@vger.kernel.org; peppe.cavallaro@st.com;
alexandre.torgue@foss.st.com; davem@davemloft.net;
mcoquelin.stm32@gmail.com; Voon, Weifeng
[off-list ref]; Ong, Boon Leong
[off-list ref]; Tan, Tee Min
[off-list ref]; vee.khee.wong@linux.intel.com;
Wong, Vee Khee [off-list ref]; linux-stm32@st-
md-mailman.stormreply.com; linux-arm-
kernel@lists.infradead.org; linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH net-next v4 0/3] Enable 2.5Gbps
speed for stmmac

Michael,

On Thu, Jun 03, 2021 at 02:08:51PM +0100, Russell King (Oracle)
wrote:

quoted

Hi,

On Thu, Jun 03, 2021 at 07:50:29PM +0800, Michael Sit Wei Hong

wrote:

quoted

quoted

Intel mGbE supports 2.5Gbps link speed by overclocking the

clock

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rate by 2.5 times to support 2.5Gbps link speed. In this mode,

the

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serdes/PHY operates at a serial baud rate of 3.125 Gbps and

the PCS

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data path and GMII interface of the MAC operate at 312.5

MHz instead of 125 MHz.

quoted

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This is configured in the BIOS during boot up. The kernel

driver is

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not able access to modify the clock rate for 1Gbps/2.5G mode

on the

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fly. The way to determine the current 1G/2.5G mode is by

reading a

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dedicated adhoc register through mdio bus.

How does this interact with Vladimir's "Convert xpcs to

phylink_pcs_ops"

quoted

series? Is there an inter-dependency between these, or a

preferred

quoted

order that they should be applied?

Thanks.

My preferred order would be for my series to go in first, if
possible, because I don't have hardware readily available to test,
and VK already has tested my patches a few times until they
reached a stable state.

I went through your patches and I think rebasing on top of my
phylink_pcs_ops conversion should be easy.

Thanks.

Sure! I am okay to let you merge your codes and rebase my changes later on
Do let me know when I can start rebasing and send in the next revision


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