lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 8 Feb 2010 15:49:51 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	Mike Rapoport <mike@...pulab.co.il>
Cc:	Steve Glendinning <steve.glendinning@...c.com>,
	netdev@...r.kernel.org,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: smsc911x suspend/resume

On Mon, Feb 08, 2010 at 04:42:25PM +0200, Mike Rapoport wrote:
> Daniel Mack wrote:
> > In fact the datasheet doesn't really state that, and the chip seems
> > to expect the power domains to remain switched on during suspend, and
> > all power switching is done internally. Also the table in "7.4 Power
> > Consumption (Device and System Components)" describes it like that.
> > 
> > So it all comes down to the question of how low-power you need to be,
> > and whether you need wake-on-lan or not. What's currently implemented is
> > D1, but adding support for D2 should be easy.
> 
> I did some brute force save/restore of smsc9220 registers and it seems
> to wake up now.
> The question now is how to make it in a "generic" way ...
> Thanks for the help anyway :)

Hmm, be careful about switching off power supplies that aren't supposed
to be switched off while others are still powered. You can easily
destroy hardware with that. Depending on how things are wired up
internally, voltages can leak from one unit block to the other. Maybe
Steve can can give a statement from official SMSC source about whether
it is safe to switch off VDD33A in this case.

Anyway, from what's written in the datasheet, I wouldn't dare just
blindly doing it.

Daniel
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists