Re: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume

Paul Menzel
2020-09-24T13:02:40Z

Dear Andrew,

Am 23.09.20 um 21:28 schrieb Andrew Lunn:
>>>> How much does this increase the resume time?
>
> Define resume time? Until you get the display manager unlock screen?
> Or do you need working networking?

Until network is functional again. Currently, the speed negotiation
alone takes three(?) seconds, so making it even longer is unacceptable.
(You wrote it below.)

> It takes around 1.5 seconds for auto negotiation to get a link. I know
> it takes me longer than that to move my fingers to the keyboard and
> type in my password to unlock the screen. So by the time you actually
> get to see your desktop, you should have link.

Not here.

> I've no idea about how the e1000e driver does link negotiation. But
> powering the PHY off means there is going to be a negotiation sometime
> later. But if you don't turn it off, the driver might be able to avoid
> doing an autoneg if the PHY has already done one when it got powered
> up.

Indeed.

Kind regards,

Paul