N900 will not allow USB OTG! - Page 104 - maemo.org

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geohsia	2010-06-03 , 06:56
Posts: 515 \| Thanked: 259 times \| Joined on Jan 2010	#1031

Originally Posted by titan

I have a possible explanation why it fails: my USB stick requests 200mA
which is the limit of the N900. I'll try again with another less power-hungry device.

I have a HDD that has its own internal power. If someone needs to test host mode with no power I am happy to give it a shot.

titan	2010-06-03 , 07:15
Posts: 946 \| Thanked: 1,650 times \| Joined on Oct 2009 @ Germany	#1032

this my HOWNOTTO get USB hostmode working.
I hope someone can replicate MohammadAG's success or at least find out what I did wrong.
Warning: This is only for experts! i2cset may damage your device.

0. you need a USB F/F adapter, the N900 USB cable and a USB device with < 200mA power consumption (verify on your PC)
1. install MohammadAG's kernel (with sarahn's patches + power ignore patch + appropriate configuration), i2ctools (i2cset in PATH) and sysklogd
I have PR1.2 installed, wifi on, bluetooth off, 2.5G, autodisconnect on. egoshin's method works (set to host while connected to PC)
2. boot device with USB cable but without USB device connected
3.

Code:

pcsuite-enable.sh

optional:

Code:

echo USB debug start > /var/log/syslog

and

Code:

echo 10 > /sys/module/musb_hdrc/parameters/debug

4. run the attached script ("sh host.txt -d" shows the state after every step)
5. immediately plug in the USB device
6. check dmesg and /proc/driver/musb_hdrc
7. to retry, unplug USB device,

Code:

killall sh; start bme; sleep 2; cat /proc/driver/musb_hdrc

after about 30sec you should see:

Code:

Status: MHDRC, Mode=Peripheral (Power=20, DevCtl=80)

then go to 4.

my results: (with -d flag)
start: Mode=Peripheral (Power=20, DevCtl=80)
echo H: Mode=Peripheral (Power=20, DevCtl=82)
echo e: Mode=Peripheral (Power=20, DevCtl=82)
echo F: Mode=Peripheral (Power=60, DevCtl=83)
bme stopped: Mode=Peripheral (Power=60, DevCtl=83)
slept 3sec: Mode=Peripheral (Power=20, DevCtl=80)
i2cset: Mode=Peripheral (Power=f1, DevCtl=99)
later: Mode=Peripheral (Power=e1, DevCtl=99)

for the description of the power+devctl flags see drivers/usb/musb/musb_regs.h

with egoshin's method:
Status: MHDRC, Mode=Host (Power=f0, DevCtl=dd)
OTG state: b_peripheral:3; active

dmesg:

Code:

[ 1863.465087] musb_restore_ctx_and_resume  435: restoring register context for musb_restore_ctx_and_resume
[ 1863.465087] rx51_xceiv_power 1
[ 1863.465698] rx51_xceiv_reset
[ 1863.850799] musb_interrupt       1948: ** IRQ peripheral usb0001 tx0000 rx0000
[ 1863.850830] musb_stage0_irq       643: <== Power=e5, DevCtl=99, int_usb=0x1
[ 1863.850860] musb_stage0_irq       829: SUSPEND (b_idle) devctl 99 power e5
[ 1863.874389] musb_interrupt       1948: ** IRQ peripheral usb0001 tx0000 rx0000
[ 1863.874420] musb_stage0_irq       643: <== Power=e1, DevCtl=99, int_usb=0x1
[ 1863.874420] musb_stage0_irq       829: SUSPEND (b_idle) devctl 99 power e1
[ 1871.680358] musb_platform_try_idle  160: b_idle inactive, for idle timer for 7 ms

what MohammadAG got with the same commands (his device is in R&D mode, but it didn't make a difference for me):
Status: MHDRC, Mode=Host (Power=f0, DevCtl=dd)
OTG state: a_host:9; active

with flash plugged in (not powered on)
Status: MHDRC, Mode=Host (Power=e0, DevCtl=99)

with bme:
Status: MHDRC, Mode=Host (Power=20, DevCtl=80)
MohammadAG: OTG state: b_idle:1; inactive

If I first apply egoshin's method I get
Status: MHDRC, Mode=Host (Power=e1, DevCtl=99)
OTG state: b_idle:1; inactive
but again no device is detected.

Attached Files

host.txt (526 Bytes, 445 views)

Last edited by titan; 2010-06-03 at 08:16.

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	Bec	2010-06-03 , 07:35
	Posts: 876 \| Thanked: 396 times \| Joined on Dec 2009	#1033

Thanks a bunch, please keep this post up to date as new info becomes available

I'll bookmark it.

Edit: is it possible that different versions of the firmwares may affect this?

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Last edited by Bec; 2010-06-03 at 07:39.

	MohammadAG	2010-06-03 , 09:05
	Posts: 2,473 \| Thanked: 12,265 times \| Joined on Oct 2009 @ Jerusalem, PS/IL	#1034

titan, just a note, according to lsusb -v my flash drive also uses 200mA.
Doing some tsts after you left I can see what you experience. I'm afraid at the time being you'll have to time it right after running the script.

Anyways, I can still reproduce it

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KOJAN	2010-06-03 , 09:13
Posts: 36 \| Thanked: 2 times \| Joined on Jan 2010	#1035

Originally Posted by titan

...1. install MohammadAG's kernel (with sarahn's patches + power ignore patch + appropriate configuration), i2ctools (i2cset in PATH) and sysklogd...

Where I can download MohammadAG's kernel?

	MohammadAG	2010-06-03 , 09:16
	Posts: 2,473 \| Thanked: 12,265 times \| Joined on Oct 2009 @ Jerusalem, PS/IL	#1036

Originally Posted by KOJAN

Where I can download MohammadAG's kernel?

Apply the patches and build a kernel.
A binary won't be provided till the app is released

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	Bec	2010-06-03 , 09:19
	Posts: 876 \| Thanked: 396 times \| Joined on Dec 2009	#1037

Isn't it possible to stop any event from happening with the stick connected so that we could use two scripts, one to let the device recognize the connection only when we want it and then "host.txt"?
This could solve our synchronization issue.

Can't the 200mA limit be overridden with kernel patching?

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	MohammadAG	2010-06-03 , 09:20
	Posts: 2,473 \| Thanked: 12,265 times \| Joined on Oct 2009 @ Jerusalem, PS/IL	#1038

The 200mA limit is a hardware one.

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	Bec	2010-06-03 , 09:24
	Posts: 876 \| Thanked: 396 times \| Joined on Dec 2009	#1039

Also since the sate of an USB device being connected becomes a state defined in the ram memory of the device, would it be possible to simply patch (some of) the code in the ram to skip some of the steps?

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	clasificado	2010-06-04 , 09:11
	Posts: 466 \| Thanked: 180 times \| Joined on Feb 2010	#1040

@Bec no offense, but this has been requested already, please keep this thread for development only.

use this thread instead for petitions and questions. developers comment there too

http://talk.maemo.org/showthread.php...ight=host+mode