linux-kernel - Re: [PATCH v2 1/3] usb: notify hcd when USB device suspend or resume

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Date:	Wed, 13 May 2015 10:14:37 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Lu, Baolu" <baolu.lu@...ux.intel.com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] usb: notify hcd when USB device suspend or resume

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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