Re: [PATCH RFC v2] support SATA ODD zero power

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æ äï2011-03-22 æ 07:06 +0000ïjoeyli(Joey Lee) æåï
> Hi Tejun, 
> 
> æ äï2011-03-21 æ 18:27 +0100ïTejun Heo æåï
> > Hello,
> > 
> > On Mon, Mar 21, 2011 at 12:07:21AM -0600, Joey Lee wrote:
> > > Sorry bother you for about support SATA ODD zero power in kernel.
> > > 
> > > Henry didn't reply me. 
> > > Could you please kindly give any comment for this topic?
> > > 
> > > Looks the SATA ODD zero power didn't have good power reserve number,
> > > does that mean support it in Linux kernel is not worthwhile?
> > 
> > Well, 0.1-0.2w is not nothing.  It could be meaningful I guess, but
> > the concern that I have are...
> > 
> > * How wildly is it gonna be deployed?  Most ultraportables don't have
> >   ODDs to begin with and extra features in ATA land tend to be very
> >   cumbersome to deploy.  It usually ends up like - half of them
> >   reporting the supportq incorrectly, quarter of them malfunction when
> >   enabled and so on.
> > 
> 
> Per my understood, Intel and AMD's are said they support SATA ODD zero
> power on newest notebook platform, and currently still have many
> notebook ship with ODD. Intel didn't open their spec for support this
> new function.
> 
> And, 
> Yes, this patch didn't test on ultraportables, especially for if they
> try to use USB ODD. For this patch We still need have a lot of test.
> 
> > * Why is software involved in this at all?  The device needs to
> >   process the eject button to begin with.  I don't really see why ACPI
> >   or operating system needs to be involved here at all.  What prevents
> >   ODD from implementing it itself?  Is there any fundamental reason
> >   why OS should be involved?
> > 
> 
> I don't know how does Intel implement this function (by EC or ACPI?),
> but AMD customized a ACPI object to provide this function. I will find a
> chance to use this function on Windows platform, per hardward guys give
> me some information, Windows can resume the ODD power from GUI, I will
> try to verify it on Windows platform then reply to this mail.
> 

More information about the SATA ODD zero power support on Windows
platform from BIOSer. Unfortunately, I still didn't see the REAL windows
system that support SATA ODD zero power.

Per discuss with BIOSer, they said: 
	- The ODD icon still show up when ODD power-off.
		+ Driver turn-off ODD power if there have no disk in tray.
	- End user can power-on ODD by click ODD icon on GUI.
		+ Driver evaluate ACPI method to power-on ODD.
	- Intel and AMD all use ACPI to implement interactive with Windows.

Until now, Intel still didn't open any spec for ODD, as I know, there
also didn't have many shipped notebook support it.


Thank's a lot!
Joey Lee

> >   The thing is that if it isn't essential, people aren't gonna
> >   implement it anyway and we just end up with unused code.
> > 
> > Thanks.
> > 
> 
> Yes, this is not a essential feature, just Intel and AMD all said they
> support it and some ODM also want to implement. 
> 
> 
> Thank's a lot!
> Joey Lee
> 


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