xHCI LPM Support

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Hi Mathias,

I was using (up until today) v3.13 (on my desktop PC) to test LPM
transitions against OMAP5. Since I was having some issues with U1 exit
after some 200 iterations I decided to make sure v3.15-rc4 would have
the same behavior but, to my surprise, xHCI doesn't do any LPM
transitions anymore.

What changed since v3.13 ? Why aren't LPM transitions enabled anymore ?

I _do_ have an Intel chipset so XHCI_LPM_SUPPORT should be set.

Any ideas ?

-- 
balbi

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