On Wed, Jul 18, 2007 at 10:27:17AM -0700, David Brownell wrote: > On Wednesday 18 July 2007, Pierre Ossman wrote: > > On Tue, 17 Jul 2007 09:11:15 -0700 > > David Brownell <[EMAIL PROTECTED]> wrote: > > > > > Ideally, someone with access to full MMC and SD specs can see > > > what they say about the SPI clocking. The simplified SD specs > > > omit the timing diagrams. > > > > > > > I can probably help out there. > > > > According to the specs, both mode 0 and mode 3 are valid. The idle > > polarity simply isn't specified, only that data shall be sampled on > > rising edge. Hence mode 0 or 3. > > Thanks. In that case, I'm thinking there *IS* a bug of some kind > in the controller driver Anton is using, else mode 3 would work > for him like it (evidently) works for everyone else.
I've checked with MPC8323E reference manual, and according to it spi_mpc83xx is doing right thing. > I'll see about making time to see if mode 0 works for me too; but > even if it does, I'd prefer to leave the driver the way it is now > instead of changing it to cover up for that mpc83xx bug ... plus, > I just like CPHA=1 modes better because they don't need to start > with that strange half-clock. ;) Well. As Pierre Ossman told, it should work at any mode. That also proves that it's not mpc83xx's bug (because even if it would be a bug, and spi_mpc83xx having inversed values, it's still should work). So, it's likely depends on spi controller, maybe some timing issues or signal shapes, which distracts SD/MMC... Not sure. But then, may I ask for "alt_mode" (bool) platform data variable? Thanks! -- Anton Vorontsov email: [EMAIL PROTECTED] backup email: [EMAIL PROTECTED] irc://irc.freenode.net/bd2 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
