* Felipe Balbi [off-list ref] [120529 00:46]:

Can you enable debugging on menelaus so we see what the driver is doing ?

I believe that to change the VMMC's supply voltage you need to turn off
the regulator, meaning LDO_CTRL7[1:0] = 0b00.

Looks like it's some kind of race between the slots that now gets triggered
in the omap driver.

Commenting out the second slot in the board file fixes things. I tried adding
a mutex to protect the sequence between POWER_UP and POWER_ON, but no luck yet.

Also adding printk statements here and there makes it work again.

Regards,

Tony