Re: [PATCH] usb: xhci-plat: Enable USB 2.0 hardware LPM support forplatform xHCs

[Julius Werner]

> 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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