linux-kernel - Re: [PATCH net-next v1 1/1] net: phy: dp83td510: add cable testing support

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Message-ID: <ZpFK8-1d9ZAPUF_m@pengutronix.de>
Date: Fri, 12 Jul 2024 17:25:39 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	kernel@...gutronix.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/1] net: phy: dp83td510: add cable testing
 support

On Fri, Jul 12, 2024 at 05:20:06PM +0200, Andrew Lunn wrote:
> > > > +#define DP83TD510E_TDR_CFG2			0x301
> > > > +#define DP83TD510E_TDR_END_TAP_INDEX_1		GENMASK(14, 8)
> > > > +#define DP83TD510E_TDR_END_TAP_INDEX_1_DEF	36
> > > > +#define DP83TD510E_TDR_START_TAP_INDEX_1	GENMASK(6, 0)
> > > > +#define DP83TD510E_TDR_START_TAP_INDEX_1_DEF	3
> > > 
> > > Does this correspond the minimum and maximum distance it will test?
> > > Is this 3m to 36m?
> > 
> > No. At least, i can't confirm it with tests.
> > 
> > If I see it correctly, this PHY is using SSTDR instead of usual TDR.
> > Instead of pulses it will send modulated transmission with default
> > length of 16ms
> > 
> > I tried my best google foo, but was not able to find anything
> > understandable about "Start/End tap index for echo coeff sweep for segment 1"
> > im context of SSTDR. If anyone know more about this, please tell me :)
> 
> I was just curious. Does not really matter with respect to getting the
> patch applied.
 
No problem, I was so nerd sniped that I had to dive deeper into the
matter :)

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