mmc_spi with GPIO_MODE_3

mmc_spi with GPIO_MODE_3

[Stepanov, Sergej]

Hello Anton,

could you say me please, would the mmc_spi-driver function with GPIO_MODE_3=
?

I have seen in mmc_spi_probe() this spi->mode =3D SPI_MODE_0.
What should come back if i have CI and CP other then in SPI_MODE_0?

Thank you for any advice.
Sergej.

Re: mmc_spi with GPIO_MODE_3

[Anton Vorontsov]

On Fri, Oct 31, 2008 at 01:49:31PM +0100, Stepanov, Sergej wrote:
> Hello Anton,
> 
> could you say me please, would the mmc_spi-driver function with GPIO_MODE_3?

You mean SPI_MODE_3? Well, it should work, or even better it shouldn't
matter if it is 3 or 0. See Pierre's answer:
http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg00160.html

But in reality MODE_0 works better.

http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg00155.html
http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg00231.html

IIRC nobody knows why exactly this happens, or better, nobody bothered
to investigate, since MODE_0 works OK. ;-)

> I have seen in mmc_spi_probe() this spi->mode = SPI_MODE_0.
> What should come back if i have CI and CP other then in SPI_MODE_0?

Something like this I suppose:

http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg00153.html

-- 
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2

AW: mmc_spi with GPIO_MODE_3

[Stepanov, Sergej]

Thanks for answer

somewhere i have seen:
"For a while it seemed like MMC cards worked OK but not SD cards!"

Hm...
I have a SD card: Transcend, 512Mb... may it be the problem?..

Sergej.
________________________________________
Von: Anton Vorontsov [avorontsov@ru.mvista.com]
Gesendet: Freitag, 31. Oktober 2008 14:45
An: Stepanov, Sergej
Cc: linuxppc-dev@ozlabs.org
Betreff: Re: mmc_spi with GPIO_MODE_3

On Fri, Oct 31, 2008 at 01:49:31PM +0100, Stepanov, Sergej wrote:
> Hello Anton,
>
> could you say me please, would the mmc_spi-driver function with GPIO_MODE=
_3?

You mean SPI_MODE_3? Well, it should work, or even better it shouldn't
matter if it is 3 or 0. See Pierre's answer:
http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg0016=
0.html

But in reality MODE_0 works better.

http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg0015=
5.html
http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg0023=
1.html

IIRC nobody knows why exactly this happens, or better, nobody bothered
to investigate, since MODE_0 works OK. ;-)

> I have seen in mmc_spi_probe() this spi->mode =3D SPI_MODE_0.
> What should come back if i have CI and CP other then in SPI_MODE_0?

Something like this I suppose:

http://www.mail-archive.com/spi-devel-general@lists.sourceforge.net/msg0015=
3.html

--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2