N900 will not allow USB OTG! - Page 100 - maemo.org

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	Bec	2010-05-31 , 17:19
	Posts: 876 \| Thanked: 396 times \| Joined on Dec 2009	#991

Well at least nokia seems to hear what we want hehe

http://www.youtube.com/watch?v=xl4oU...layer_embedded

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blue_led	2010-05-31 , 22:29
Posts: 306 \| Thanked: 566 times \| Joined on Jan 2010 @ Romania	#992

stable "almost host" procedure
1 disable bme
2 plug ANY uB with ID grounded
3 echo host > ....
4 echo H > ....
5 apply 5v from extern or intern source
6 attach stick, hub,...

enumeration seems to happen once.
to restart enumeration unplug uB and go to step 2

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	javispedro	2010-05-31 , 22:34
	Posts: 2,355 \| Thanked: 5,249 times \| Joined on Jan 2009 @ Barcelona	#993

The only thing setting idpin does is changing the initial state of the otg state machine to a_host, and even that is undone when you apply vbus, since for some reason twl4030-usb assumes vbus has prority over id pin connection.

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	MohammadAG	2010-05-31 , 22:37
	Posts: 2,473 \| Thanked: 12,265 times \| Joined on Oct 2009 @ Jerusalem, PS/IL	#994

And as I said before, echo host > ... is redundant (or null() as joerg_rw calls it)

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sarahn	2010-05-31 , 23:57
Posts: 243 \| Thanked: 172 times \| Joined on Sep 2007 @ silicon valley	#995

Originally Posted by joerg_rw

sarahn
extremely encouraging results, indeed. :-)
You have any idea why we need a hardware ID_GND and can not fake it?

would you mind posting a proper diff so we can know what exactly you patched in kernel and also which kernel that is based on, please.
A super nice-to-have of course would be if you could apply hcm's pearl script to the whole usb folder (of course after you created the diff), and also supply the result of that, so we finally get an idea what's happening in detail when forcing host mode, function by function - kind like a trace.

many thanks
jOERG

I agree the ID pin shouldn't be necessary and I'm working on that right now.

On the subject of function traces, ftrace would be quite nice. I managed to get zImage to compile and run with ftrace enabled but the modules still had the function __gnu_mcount_nc missing.

Attached Files

forced_host.0.1.zip (20.1 KB, 188 views)

Last edited by sarahn; 2010-06-01 at 01:47. Reason: Added superstitious acripts

sarahn	2010-06-01 , 00:11
Posts: 243 \| Thanked: 172 times \| Joined on Sep 2007 @ silicon valley	#996

Originally Posted by blue_led

stable "almost host" procedure
1 disable bme
2 plug ANY uB with ID grounded
3 echo host > ....
4 echo H > ....
5 apply 5v from extern or intern source
6 attach stick, hub,...

enumeration seems to happen once.
to restart enumeration unplug uB and go to step 2

I'm not able to duplicate. Can you post dmesg + /proc/driver/musb_hdrc step by step?

sarahn	2010-06-01 , 00:28
Posts: 243 \| Thanked: 172 times \| Joined on Sep 2007 @ silicon valley	#997

Originally Posted by javispedro

The only thing setting idpin does is changing the initial state of the otg state machine to a_host, and even that is undone when you apply vbus, since for some reason twl4030-usb assumes vbus has prority over id pin connection.

Grouding the id pin sets the a_idle state, not a_host.

If I plug in power after I plug in a grounded ID pin,

/sys/class/i2c-adapter/i2c-1/1-0048/twl4030_usb/linkstat

does not change to read vbus. It still reads idpin. If I do both at once, vbus takes priority.

jimx	2010-06-01 , 00:31
Posts: 5 \| Thanked: 1 time \| Joined on May 2010	#998

Extraordinary results. Is there any chance of an 'interim release' just to get us ordinary mortals up-and-running with a USB keyboard in the meantime? It would make such a huge difference.

Apologies if this is an inappropriate request. Very very best of luck with this project - I think I'm not the only one here following this thread with bated breath...

maxximuscool	2010-06-01 , 03:17
Posts: 3,664 \| Thanked: 1,530 times \| Joined on Sep 2009 @ Hamilton, New Zealand	#999

Originally Posted by jimx

Extraordinary results. Is there any chance of an 'interim release' just to get us ordinary mortals up-and-running with a USB keyboard in the meantime? It would make such a huge difference.

Apologies if this is an inappropriate request. Very very best of luck with this project - I think I'm not the only one here following this thread with bated breath...

Wrong, I am here always following this thread too lol. I think everyone is following this thread very closely. If there is a break through in thi OTG USB then it will be a world peace..