Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk

From	Dave Mielke <dave@mielke.cc>
Newsgroups	linux.kernel
Subject	Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk
Date	2017-03-13 11:40 +0100
Message-ID	<tkvyp-7D9-1@gated-at.bofh.it> (permalink)
References	<tknhv-1pV-1@gated-at.bofh.it> <tknhv-1pV-5@gated-at.bofh.it> <tknhv-1pV-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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[quoted lines by Alan Stern on 2017/03/12 at 21:40 -0400]

>No, I was wondering why an HID device would run at high speed.  Both
>you and Samuel implied that this was because it was a USB-2 device.  
>But that is not an adequate answer, because it is perfectly valid for a 
>USB-2 device to run at full speed.

I think I've misunderstood something about how to interpret bInterval. I'm now 
suspecting that bInterval must be interpreted the new (mocro frame) way only if 
the device is operating at least at high speed, and that, even if the device 
advertizes itself as USB 2.0, bInterval must still be interpreted the old way 
if the device is operating at full or low speed. Is that correct?

If the above is correct, how can we tell from usbfs which way to interpret 
bInterval?

-- 
Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | http://Mielke.cc/bible/
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Thread

Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk Dave Mielke <dave@mielke.cc> - 2017-03-13 02:50 +0100
  Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk Dave Mielke <dave@mielke.cc> - 2017-03-13 11:40 +0100
  Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk Alan Stern <stern@rowland.harvard.edu> - 2017-03-14 02:50 +0100
    Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk Dave Mielke <dave@mielke.cc> - 2017-03-14 03:30 +0100

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