Date: Mon, 30 Mar 2015 11:51:08 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Kohji Okuno <okuno.kohji@jp.panasonic.com> Cc: freebsd-usb@freebsd.org Subject: Re: Why do we try to enter U1 mode in SuperSpeed? Message-ID: <55191C8C.70008@selasky.org> In-Reply-To: <20150330.183658.1414013626189866994.okuno.kohji@jp.panasonic.com> References: <20150330.135402.19625324788487516.okuno.kohji@jp.panasonic.com> <55190F3C.4070901@selasky.org> <55191530.3030804@selasky.org> <20150330.183658.1414013626189866994.okuno.kohji@jp.panasonic.com>
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On 03/30/15 11:36, Kohji Okuno wrote: > Hi HPS, > > > I will try programming values 0xFF. > By the way, why should we set these timeout value? > I think, we don't have to change from default values (U1 Timeout = 0, > U2 Timeout= 0). Hi, I think the default '0' is the same like '255' - disable power save? Where is the meaning of "default" defined in this case? In the USB v3.0 specification it says that we shall not enable the U2 timeout for a downstream port that is connected to a HUB. Currently there is no check for that. We might want to add such a check. --HPS
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