Hi,

On Tue, May 29, 2012 at 05:47:32AM -0700, Tony Lindgren wrote:

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

quoted

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.

does this help ?

diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index 518091c..5a224fc 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c

@@ -397,8 +397,8 @@ static int n8x0_mmc_late_init(struct device *dev)
 	if (r < 0)
 		return r;
 
-	n8x0_mmc_set_power(dev, 0, MMC_POWER_ON, 16); /* MMC_VDD_28_29 */
-	n8x0_mmc_set_power(dev, 1, MMC_POWER_ON, 16);
+//	n8x0_mmc_set_power(dev, 0, MMC_POWER_ON, 16); /* MMC_VDD_28_29 */
+//	n8x0_mmc_set_power(dev, 1, MMC_POWER_ON, 16);
 
 	r = menelaus_set_mmc_slot(1, 1, 0, 1);
 	if (r < 0)

-- 
balbi