linux-kernel - RE: [PATCH net-next] net: phy: micrel: Fix latency issues in LAN8814 PHY

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Message-ID: <CO1PR11MB47710AD95DA87237D527B3D4E2809@CO1PR11MB4771.namprd11.prod.outlook.com>
Date:   Wed, 6 Jul 2022 11:57:34 +0000
From:   <Divya.Koppera@...rochip.com>
To:     <andrew@...n.ch>
CC:     <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>,
        <Madhuri.Sripada@...rochip.com>
Subject: RE: [PATCH net-next] net: phy: micrel: Fix latency issues in LAN8814
 PHY

Hi Andrew,

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Tuesday, July 5, 2022 8:45 PM
> To: Divya Koppera - I30481 <Divya.Koppera@...rochip.com>
> Cc: hkallweit1@...il.com; linux@...linux.org.uk; davem@...emloft.net;
> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; UNGLinuxDriver
> <UNGLinuxDriver@...rochip.com>; Madhuri Sripada - I34878
> <Madhuri.Sripada@...rochip.com>
> Subject: Re: [PATCH net-next] net: phy: micrel: Fix latency issues in LAN8814
> PHY
> 
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the
> content is safe
> 
> On Tue, Jul 05, 2022 at 04:35:54PM +0530, Divya Koppera wrote:
> > Latency adjustments done for 1-step and 2-step from default latency
> > register values to fix negative and high mean path delays.
> 
> You forgot to Cc: the PTP maintainer.
> 
> Doesn't this change break user space tools which have already measured the
> latency and is doing a correction?

This corrections can be done using user space tools. But I tried to fix it in phy rather than giving chance to application.

This will work on only certain platforms. So I'm dropping this change to get into kernel.

Thanks
Divya

> 
>     Andrew