On Wed, 13 May 2015, Lu, Baolu wrote:

>  From software point of view, the extra time it takes to ask for cache
> operation can be measured in xhci_device_suspend(). I can measure
> the data later when I complete my tasks in hand. If that data is ignorable
> comparing to the suspend time, we can simply do it always.

Or do it whenever the hardware doesn't support FSC.  That seems 
reasonable.

Alan Stern

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