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Don't bother with USB 3 OTG cables

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By sarman_1998, Junior Member on 5th January 2014, 08:55 PM
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I've spent a lot of time in the last week trying to see if my Galaxy Note 3 SM-N900T is actually capable of USB 3.0 in host mode. From my investigations to date, it isn't supported. Here is a brief summary of what I tried:
  • 3 different USB 3.0 OTG Cables
  • Custom built kernel to enable logging of xHCI driver
  • Modified xHCI driver source to cause an extra reset on the USB 3 port when USB 2 port shows a connect
    Never saw a change of the USB 3 port status register in the xHCI controller
  • Modified xHCI driver source to disable USB 2 port when a connection happens then reset USB 3 port
    Never saw a change of the USB 3 port status register in the xHCI controller
  • Connected phone through USB 3 protocol analyzer to see if it was making any attempt to negotiate a USB 3 link.
    No sign phone was trying USB 3 link negotiation.
  • Used modified windows xhci driver to attempt to read the OTG Descriptor defined in the latest USB OTG Spec
    Phone returned Stall, meaning it doesn't support that descriptor

It's still possible that the phone will support USB 3 OTG. It may be that there is some signalling to switch the USB 3 port from device to host mode that isn't currently in the code. I did do some looking for this but haven't found anything yet.

I'll update this thread if I get any new, hopefully encouraging, information.
Eric
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5th January 2014, 08:59 PM |#2  
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Thanks. I've almost bought disk due to OTG

Odesláno z mého SM-N9005 pomocí Tapatalk
6th January 2014, 12:06 AM |#3  
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Ordered my cable yesterday it was only 5 bucks though.. will regular otg still work

Sent from my SM-N900T using Tapatalk
6th January 2014, 02:08 AM |#4  
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Quote:
Originally Posted by ktetreault14

Ordered my cable yesterday it was only 5 bucks though.. will regular otg still work

Sent from my SM-N900T using Tapatalk

Yes it will work just fine. The new cable just won't work any better.
Look on the bright side. now if one cable breaks you have a backup.
6th January 2014, 02:10 AM |#5  
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Atleast the usb 3.0 cables work with 2.0

Sent from my SM-N900T using Tapatalk
5th March 2014, 02:21 AM |#6  
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Hi Eric,

Have you found out any more information on the subject? I've tried to get USB 3.0 OTG working on the N900 (Exynos) and N9005 (Snapdragon) variants with no success.

Do you know of any other developers who have had any success? Or does anyone know if contacting Samsung would be worthwhile?
5th March 2014, 08:22 AM |#7  
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SM-N900 Exynos..
Kitkat 4.4.2
Halaszk kernel
VN Rom v8.1

1TB harddisk with USB 2.0 OTG
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25th May 2018, 05:22 PM |#8  
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Sorry for bringing up a very old thread I just want to know if it's conclusively affirmed that Note 3 cannot operate in USB 3.0 mode as host (OTG) for both Snapdragon and Exynos variants?

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