Date: Wed, 12 Jan 2005 14:39:18 -0500 From: Christopher Sean Hilton <chris@vindaloo.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: nate@root.org Subject: Re: Suspend problem on FreeBSD 5.3-STABLE Message-ID: <20050112193918.GA17164@yavin.vindaloo.com> In-Reply-To: <20050112.072948.89901373.imp@bsdimp.com> References: <41E19C0E.6030400@root.org> <41E48E70.30807@vindaloo.com> <41E4BC93.40608@root.org> <20050112.072948.89901373.imp@bsdimp.com>
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On Wed, Jan 12, 2005 at 07:29:48AM -0700, M. Warner Losh wrote:
> : > FA411 16 bit PCMCIA card after a suspend/resume works as expected. I
> : > will try to down the interface and kldunload the dc driver before
> : > shutdown to see if that helps.
> :
> : That fits with my analysis as well. It seems that cardbus handles
> : things fine but individual drivers may be lacking in suspend/resume support.
>
> Cardbus should be detaching and reattaching the device. So that's
> clearly a bug in cardbus. Individual drivers have no choice in this
> matter, since we can't know if the cards that are there after the
> resume were the ones we suspended with. This doesn't matter too much
> for NIC cards (but none of the drivers cope with MAC addresses
> changing), but matters a great deal for things like flash cards.
>
> : That's a good testing approach, btw. If you find the dc(4) driver seems
> : to be the culprit, the next step is to go through any datasheets and
> : other OS drivers to see if you can find what we're doing differently.
>
> I don't think that it is a dc problem.
>
After my tests I'm not sure where it is. Here's what I did:
o Compiled a kernel without dc support so I could
# kldload if_dc
o Loaded if_dc.ko as a module
o Inserted the card
At this time the card was properly probed.
o Ran dhclient dc0 and observed the card get an ip address from
my dhcp server.
o Did some more network tests (hit http://www.ebay.com in
firefox...)
o Turned off the card nicely prior to detaching it:
# ifconfig dc0 down delete
o Unplugged the card and observed it detach from the cbb0
"slot".
o Unloaded the if_dc driver:
# kldunload if_dc
o Suspend the laptop to standby mode:
# sysctl hw.acpi.lid_switch_state="S3"
Close the laptop's lid
o Resume:
Open the laptop's lid
o Reload the driver (kldload if_dc...)
o Pluggin the card
At this time the cardbus driver reports:
"cbb0: CardBus card activation failed"
This leads me to believe that either the CardBus handler has a problem
attaching an existing "used" dc driver to the card after a
suspend/resume or the dc driver has left something in a state after
it's detach where a re-attach will not work correctly.
Has anyone got any other ideas?
-- Chris
--
--
Chris Hilton chilton-at-vindaloo-dot-com
------------------------------------------------------------------------
"All I was doing was trying to get home from work!"
-- Rosa Parks
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