Re: [RFC PATCH v1 8/9] net: phy: micrel: ksz886x/ksz8081: add cabletest support

Andrew Lunn
2021-05-10T13:40:41Z

On Mon, May 10, 2021 at 11:06:56AM +0200, Oleksij Rempel wrote:
> On Wed, May 05, 2021 at 02:47:19PM +0200, Andrew Lunn wrote:
> > On Wed, May 05, 2021 at 11:20:24AM +0200, Oleksij Rempel wrote:
> > > This patch support for cable test for the ksz886x switches and the
> > > ksz8081 PHY.
> > >
> > > The patch was tested on a KSZ8873RLL switch with following results:
> > >
> > > - port 1:
> > > - cannot detect any distance
> > > - provides inverted values
> > > (Errata: DS80000830A: "LinkMD does not work on Port 1",
> > > http://ww1.microchip.com/downloads/en/DeviceDoc/KSZ8873-Errata-DS80000830A.pdf)
> > > - Reports "short" on open or ok.
> > > - Reports "ok" on short.
> >
> > Quite broken. Distance is optional, simply don't report it. Status is
> > harder. Reporting ETHTOOL_A_CABLE_RESULT_CODE_OK should really mean
> > the cable is O.K. If you cannot tell open from O.K, i would return
> > ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC.
> >
>
> Yes, patch "net: phy: micrel: add patch for erratas on port1" provides
> a flag to return -ENOTSUPP on this port.
>
> Is it acceptable way? Should I squash this patches?

This is O.K. Maybe add a comment that later patches in the series with
handle the errata?

Andrew