Date: Mon, 30 Mar 2015 18:13:06 +0900 (JST) From: Kohji Okuno <okuno.kohji@jp.panasonic.com> To: hps@selasky.org Cc: freebsd-usb@freebsd.org Subject: Re: Why do we try to enter U1 mode in SuperSpeed? Message-ID: <20150330.181306.839194614732046381.okuno.kohji@jp.panasonic.com> In-Reply-To: <55190F3C.4070901@selasky.org> References: <20150330.135402.19625324788487516.okuno.kohji@jp.panasonic.com> <55190F3C.4070901@selasky.org>
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Hi HPS,
> On 03/30/15 06:54, Kohji Okuno wrote:
>> Hi HPS
>>
>> I have a question.
>> Why do we try to enter U1 mode in SuperSpeed?
>> This is the following codes(***)
>>
>> In our proprietary environmen(This has a xHCI controller), when a
>> device accept U1, the device may be strange status. Acutually, when I
>> tried to connect "Western Digital My Passport Essential 320GB
>> (P/N:WDBACY3200ABK-00)", this HDD was not recognized correctly.
>> But, in PC environment, this HDD was recognized correctly.
>>
>> Regards,
>> Kohji Okuno
>>
>> (***)
>> usb_hub.c:
>> 793 if (speed == USB_SPEED_SUPER) {
>> 794 err = usbd_req_set_hub_u1_timeout(udev, NULL,
>> 795 portno, 128 - (2 * udev->depth));
>> 796 if (err) {
>> 797 DPRINTFN(0, "port %d U1 timeout "
>> 798 "failed, error=%s\n",
>> 799 portno, usbd_errstr(err));
>> 800 }
>> 801 err = usbd_req_set_hub_u2_timeout(udev, NULL,
>> 802 portno, 128 - (2 * udev->depth));
>> 803 if (err) {
>> 804 DPRINTFN(0, "port %d U2 timeout "
>> 805 "failed, error=%s\n",
>> 806 portno, usbd_errstr(err));
>> 807 }
>> 808 }
>
> Hi,
>
> We are not trying to enter U1 mode, we only setup the U1 and U2 timeouts. Is
> there a flag in the USB descriptors that say this is not supported and that we
> need to set some other value? I thought all superspeed devices had to support
> these features and that switching in and out of the sleep modes was done by
> the XHCI hardware.
>
> --HPS
Thank you for your prompt response.
I understood your comment. And, I missunderstood about this.
But, in our xHCI, when we set these timeout values, its xHCI
controller sends LGO_U1 and the specified HDD accepts LGO_U1.
In this result, its HDD is not recognized correctly.
I think that our xHCI is wrong...
--
Regards,
Kohji Okuno
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