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Date: Thu, 8 Mar 2012 14:35:07 +0800
Message-ID: <CAHaq0gKxw9Lir2bB__jNmmZPzbgq7Ky6v9Ps2RVexbnRjd8a2g@mail.gmail.com> (sfid-20120308_073515_895261_41E30DCC)
Subject: Re: rt8192cu on USB3
From: jerome huang <jerome.syno@gmail.com>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: linux-wireless@vger.kernel.org,
	Sarah Sharp <sarah.a.sharp@linux.intel.com>,
	linux-usb@vger.kernel.org
Content-Type: text/plain; charset=ISO-8859-1
Sender: linux-wireless-owner@vger.kernel.org

On 8 March 2012 10:35, Larry Finger <Larry.Finger@lwfinger.net> wrote:
> On 03/07/2012 08:16 PM, jerome huang wrote:
>>
>> log:
>> [53614.238023] Compat-wireless backport release: compat-wireless-v3.2-1-s
>> [53614.244729] Backport based on linux-stable.git v3.2
>> [53614.368074] alg: No test for arc4 (arc4-generic)
>> [53614.402781] cfg80211: Calling CRDA to update world regulatory domain
>> [53614.498603] rtl8192cu 3-3:1.0: usb_probe_interface
>> [53614.503552] rtl8192cu 3-3:1.0: usb_probe_interface - got id
>> [53614.509920] rtl8192cu: rtl8192cu: Chip version 0x11
>> [53615.359336] rtl8192cu: MAC address: 08:10:74:f1:a1:0f
>> [53615.364575] rtl8192cu: Board Type 0
>> [53615.400583] rtlwifi: rx_max_size 15360, rx_urb_num 8, in_ep 1
>> [53615.408918] usbcore: registered new interface driver rtl8192cu
>> [53652.483311] rtl8192cu: MAC auto ON okay!
>> [53652.887348] rtl8192cu: Tx queue select: 0x05
>> [53652.921326] rtl8192c_common: Loading firmware file
>> rtlwifi/rtl8192cufw.bin
>>
>> And I'm sure the function rtl_block_fw_writeN is used for firmware
>> uploading.
>>
>> On 8 March 2012 10:03, jerome huang<jerome.syno@gmail.com> ?wrote:
>>>
>>> Hi,
>>>
>>> I found a problem just like in the older discussion "Question about
>>> error from xhci-hcd",
>>> there was a xhci error "no room on ep ring" when plugin rtl8192cu on
>>> USB3.
>>> (it works on USB2)
>>>
>>> After applying Larry's patch "rtlwifi: rtl8192cu: Change firmware
>>> upload to use block writes",
>>> I still get the same error "no room on ep ring".
>>>
>>> But under the same compat-wireless version,
>>> rt8712 works on USB3.
>>>
>>> Does anyone still encounter this problem after applying this patch?
>>> or do I miss something/patches?
>
>
> This problem is in the USB system, not in the wireless driver. Keep me as a
> Cc, but send mail to Sarah Sharp <sarah.a.sharp@linux.intel.com> and
> linux-usb@vger.kernel.org. They will tell you what debugging is needed.
>
> The patch was an attempt to minimize the number of writes needed to upload
> the firmware, but it had no effect; however, it was still a good change.
>
> I'm confused about one statement you made. There is no rt8712 driver, but
> there is one named r8712u; however, it controls a completely different
> device than rtl8192cu. Do you have both devices?
>
> Larry

Hi Larry,

thanks for your help,
and sorry for my typo,
I have one rtl8192cu and one "r8712u".
Just test 8712 to check if xhci works.

I also tried to slow down between each write during firmware upload,
and enlarge the ring size in xhci_endpoint_init(),
but it seems that the trbs in the ring are not processed and
the incoming trb is always queued till ring full.

BR,
Jerome