RE: [PATCH 3/3] mmc: omap_hsmmc: enable SDIO card interrupts

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> -----Original Message-----
> From: Paul Walmsley [mailto:paul@xxxxxxxxx]
> Sent: Thursday, February 18, 2010 11:44 AM
> To: David Vrabel
> Cc: Madhusudhan; linux-mmc@xxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 3/3] mmc: omap_hsmmc: enable SDIO card interrupts
> 
> On Thu, 18 Feb 2010, David Vrabel wrote:
> 
> > Paul Walmsley wrote:
> > >
> > > Perhaps I'm misunderstanding what you're referring to, but it seems
> there
> > > is some confusion as to what target smart-idle mode does.
> >
> > The TI OMAP 34xx TRM is the one of the most obtuse document I've had to
> > read.  An even after multiple reads of relevant sections it still
> > doesn't make sense.  Parts are contradictory, parts are poorly explained
> > and some bit are just plain incorrect.
> 
> Yes.  TI needs to also release the functional specifications for each IP
> block; the information in the current TRM is generally insufficient to
> write high-quality drivers.
> 
> TI should also host a process, open to the public, to submit TRM revision
> and clarification requests, and to track their disposition.
> 
Paul, David,

Not to add further confusion but as far as I understand SDIO should be able
to asynchronously wakeup OMAP regardless of MMC clocks being OFF . As per
the SDIO spec DAT1 line is used for signaling the card interrupt to the
host. The TRM clearly shows a GPIO connected to DAT1 line for wakeup through
the SDIO interrupt. Wouldn't this help?   

> > I don't have time to sort out any of this properly -- it works well
> > enough for me.
> 
> Thanks very much for the SDIO patches.  They are appreciated.

Definitely these are good features that are being added. Just that there are
confusions around and not everyone has a setup to validate these features.
If I look in the mainline kernel today there is only one SDIO card driver "
sdio_uart.c". And at least I don't see a way I can test any of these
features myself.

Regards,
Madhu   
> 
> 
> - Paul

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