lkml.org 
[lkml]   [2013]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] usb: xhci-plat: Enable USB 2.0 hardware LPM support for platform xHCs
From
> So the 2.41a has BESL support, but may not set the BLC flag.  What
> happens if we use the HIRD encoding instead? Will things break? It
> seems like we would need to disable USB 2.0 LPM on that host all
> together, if it expects BESL encoding, but advertises HIRD encoding.

Wait a second, just for clarity: are you saying that BESL-capable
controllers do not support the old HIRD mechanism and thus just break
on non-BESL aware OSes? I would've assumed that they somehow notice if
software doesn't write to the new register and automatically fall back
to HIRD... it seems like a weird decision to break hardware backwards
compatibility like that (after all, it would mean that Linux 3.10 and
older would also break on LynxPoint systems right now).


\
 
 \ /
  Last update: 2013-08-29 01:41    [W:0.077 / U:0.444 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site