Messages in this thread | | | Date | Wed, 28 Aug 2013 16:08:12 -0700 | Subject | Re: [PATCH] usb: xhci-plat: Enable USB 2.0 hardware LPM support for platform xHCs | From | Julius Werner <> |
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> 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).
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