[U-Boot] musb_cfg.extvbus = 1 reverted by bus reset?

[Orjan Friberg]

Hi,

Using external VBUS on the OTG port in host mode, I have set 
musb_cfg.extvbus = 1.

However, after a 'usb start', the DRVVBUS bit in OTG_CTRL is always set 
to 1 (regardless of the value of musb_cfg.extvbus).  Immediately after 
boot it is 0.  (I ran 'i2c md 0x48 0xa 1'.)

In musb_hcd.c, the extvbus setting is done *before* the usb bus is 
reset.  The TPS65920 TRM says that DRVVBUS is turned on when the chip 
acts as a host.  It seems to me that the DRVVBUS setting is reverted by 
the chip going into host mode.

Any ideas?

(This is on 2011.03, but latest git seems to have the same construct.)


Thanks,
Orjan

-- 
Orjan Friberg
FlatFrog Laboratories AB