Re: [PATCH net-next v2 1/2] r8152: Add support for 5Gbit Link Speeds and EEE

[Andrew Lunn]

> > @@ -604,6 +604,7 @@ enum spd_duplex {
> >   	FORCE_100M_FULL,
> >   	FORCE_1000M_FULL,
> >   	NWAY_2500M_FULL,
> > +	NWAY_5000M_FULL,
> >   };
> >   /* OCP_ALDPS_CONFIG */
> > @@ -725,6 +726,7 @@ enum spd_duplex {
> >   #define BP4_SUPER_ONLY		0x1578	/* RTL_VER_04 only */
> >   enum rtl_register_content {
> > +	_5000bps	= BIT(12),
> 
> Based on other Realtek chips, I guess that BIT(11_ corresponds to 2500 Mbps
> over two twisted pairs. Realtek calls this 5G Lite. Similarly, there are
> 2.5G Lite and 1G Lite, offering 1250 Mbps and 500 Mbps, respectively, over
> two pairs of wires.

Oh, that is different. Normally for a -T2 link, you double the clock
frequency, so you keep the normal bandwidth. But you are saying it
does 500Base-T2, 1250Base-T2, 2500Base-T2?

Can it select these modes on its own, if the link partner is another
Realtek device? Many 1G PHYs will detect if a pair is broken and
downshift to 100Mbps, which only require two working pairs. But this
device has the option of downshifting to 500M.

	Andrew