* David Brownell <[EMAIL PROTECTED]> [070529 16:04]:
> On Tuesday 29 May 2007, Tony Lindgren wrote:
>
> > I see your point though with "autoidle", but that's after
> > the devices have enumerated the wrong way, right?
>
> You want me to look at that code again? Aargh!
>
> Originally there was no autoidle, so the logic was:
> the only way Linux will *EVER* trigger suspend at
> runtime was to try HNP. Devices that don't pass the
> whitelist test would enumerate no further.
>
> Now we have working auto-idle, so other logic could
> be applied. I think you're suggesting that maybe
> they could proceed through enumeration, fail that,
> and then autosuspend to trigger HNP ... ? That might
> be workable.
Sorry, in my snip frenzy I forgot to reply to some
parts:) Yes, well I'll see what happens with OPT and post
some results.
> The behavioral difference would be that WHEN ("not 'IF'")
> the whitelist (which is very easily checked against product
> documentation) diverges from the list of configured drivers
> (no easy way to crosscheck that and docs) things would not
> act the same.
I guess HNP should be offered for peripherals even if not
on whitelist, but only peripherals on whitelist (with HNP
or not) should be allowed.
> This is more or less what you were trying to achieve,
> yes? But it leads to surprising behavior in cases
> like:
>
> * hook up non-OTG peripheral #1 ... acts just
> the way you'd normally expect
>
> * hook up OTG peripheral #2 ... surprise! it
> refuses to act as a peripheral at first.
>
> The "principle of least astonishment" argues that
> the "peripheral #1" model should be followed for
> as long as possible. Customer service calls would
> be a lot simpler too...
Yeh I guess in that case it needs to wait for autosuspend
until #1 is done.
But if #2 is not on whitelist and can do HNP, then
it just gets rejected and never gets it's HNP opportunity.
Hmmm...
Tony
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