Messages in this thread | | | Subject | Re: [PATCH] usb: xhci: bInterval quirk for TI TUSB73x0 | From | Roger Quadros <> | Date | Fri, 10 Mar 2017 18:04:27 +0200 |
| |
On 09/03/17 11:44, Sergei Shtylyov wrote: > Hello! > > On 3/9/2017 11:47 AM, 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 trigged this condition." > > Triggered.
Should be "triggers" actually. Will fix it. Thanks.
> >> This results in Bandwidth error when devices with periodic >> endpoints (ISO/INT) having bInterval > 7 are plugged an >> 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> > [...] > > MBR, Sergei >
-- cheers, -roger
| |