Re: [PATCH v3] usb: xhci: bInterval quirk for TI TUSB73x0

From	Mathias Nyman <mathias.nyman@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v3] usb: xhci: bInterval quirk for TI TUSB73x0
Date	2017-03-22 14:10 +0100
Message-ID	<tnObw-2PV-21@gated-at.bofh.it> (permalink)
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On 22.03.2017 13:43, Roger Quadros wrote:
> As per [1] issue #4,
> "The periodic EP scheduler always tries to schedule the EPs
> that have large intervals (interval equal to or greater than
> 128 microframes) into different microframes. So it maintains
> an internal counter and increments for each large interval
> EP added. When the counter is greater than 128, the scheduler
> rejects the new EP. So when the hub re-enumerated 128 times,
> it triggers this condition."
>
> This results in Bandwidth error when devices with periodic
> endpoints (ISO/INT) having bInterval > 7 are plugged and
> unplugged several times on a TUSB73x0 XHCI host.
>
> Workaround this issue by limiting the bInterval to 7
> (i.e. interval to 6) for High-speed or faster periodic endpoints.
>
> [1] - http://www.ti.com/lit/er/sllz076/sllz076.pdf
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---

Added to my for-usb-next queue.

Thanks
-Mathias

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[PATCH v3] usb: xhci: bInterval quirk for TI TUSB73x0 Roger Quadros <rogerq@ti.com> - 2017-03-22 12:50 +0100
  Re: [PATCH v3] usb: xhci: bInterval quirk for TI TUSB73x0 Mathias Nyman <mathias.nyman@linux.intel.com> - 2017-03-22 14:10 +0100

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