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usbhost vs OTG in host mode

Herman Brunner
Intellectual 580 points
Other Parts Discussed in Thread: DM3730

Hi,

kernel 2.6.37 /EVM/DM3730 

I plan to use usbhost and I come to grips with some problems with power management. 

Usbhost clocks prevent CORE retention in idle mode (dynamic power saving) and and if usb clocks are cut it is unstable

- sometimes usbhost1_48m_fck can't be enabled when usb HS device is connected . 

I took a look at kernel 3.6 where I suppose usbhost clocks are managed from linux pm (idle frameowrk) but ehci pm  is not ready jet -

usbhost dynamic suspend/idle is switched off.

I wonder if it is possible to use OTG in host mode - from first tests it seems that it works (suspend/resume) but current on 1.8 (IO) 

is increased considerably. Also I do not know how the usbhost will behave when remote wakeup will occur. 

I need your advice and an information that anyone before has tried to use these functionalities before.  

Karol