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

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Date:   Thu, 3 Jun 2021 13:43:09 +0000
From:   "Sit, Michael Wei Hong" <michael.wei.hong.sit@...el.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        "Russell King (Oracle)" <linux@...linux.org.uk>
CC:     "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "Voon, Weifeng" <weifeng.voon@...el.com>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        "Tan, Tee Min" <tee.min.tan@...el.com>,
        "vee.khee.wong@...ux.intel.com" <vee.khee.wong@...ux.intel.com>,
        "Wong, Vee Khee" <vee.khee.wong@...el.com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RESEND PATCH net-next v4 0/3] Enable 2.5Gbps speed for stmmac

Vladimir,

> -----Original Message-----
> From: Vladimir Oltean <olteanv@...il.com>
> Sent: Thursday, June 3, 2021 9:28 PM
> To: Russell King (Oracle) <linux@...linux.org.uk>
> Cc: Sit, Michael Wei Hong <michael.wei.hong.sit@...el.com>;
> Jose.Abreu@...opsys.com; andrew@...n.ch;
> hkallweit1@...il.com; kuba@...nel.org;
> netdev@...r.kernel.org; peppe.cavallaro@...com;
> alexandre.torgue@...s.st.com; davem@...emloft.net;
> mcoquelin.stm32@...il.com; Voon, Weifeng
> <weifeng.voon@...el.com>; Ong, Boon Leong
> <boon.leong.ong@...el.com>; Tan, Tee Min
> <tee.min.tan@...el.com>; vee.khee.wong@...ux.intel.com;
> Wong, Vee Khee <vee.khee.wong@...el.com>; linux-stm32@st-
> md-mailman.stormreply.com; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.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:
> > Hi,
> >
> > On Thu, Jun 03, 2021 at 07:50:29PM +0800, Michael Sit Wei Hong
> wrote:
> > > Intel mGbE supports 2.5Gbps link speed by overclocking the
> clock
> > > rate by 2.5 times to support 2.5Gbps link speed. In this mode,
> the
> > > serdes/PHY operates at a serial baud rate of 3.125 Gbps and
> the PCS
> > > data path and GMII interface of the MAC operate at 312.5
> MHz instead of 125 MHz.
> > > This is configured in the BIOS during boot up. The kernel
> driver is
> > > not able access to modify the clock rate for 1Gbps/2.5G mode
> on the
> > > fly. The way to determine the current 1G/2.5G mode is by
> reading a
> > > dedicated adhoc register through mdio bus.
> >
> > How does this interact with Vladimir's "Convert xpcs to
> phylink_pcs_ops"
> > series? Is there an inter-dependency between these, or a
> preferred
> > 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