net/wireless/rtlwifi: problem with D-link DWA-131 USB adapter

[Igor Plyatov <plyatov@gmail.com>]

Dear developers,

I was trying to use "r8712u" staging driver on my ARM platform and it 
works fine with "D-link DWA-131" USB Wi-Fi adapter.
Then I try to use rt8192cu driver from wireless-testing GIT repository 
(last commit is 001354fa8f95219a9bf7acd60937edd5b5c02ab1).

I have firmware files installed:
root@gms:~# ls -l /lib/firmware/rtlwifi/
-rw-r--r--    1 root     root        13540 Apr  4 14:22 rtl8192cfw.bin
-rw-r--r--    1 root     root        16014 Apr  4 14:22 rtl8192cufw.bin
-rw-r--r--    1 root     root        20526 Apr  4 14:22 rtl8192defw.bin
-rw-r--r--    1 root     root        88856 Apr  4 14:22 rtl8192sefw.bin
-rw-r--r--    1 root     root       122328 Apr  4 14:22 rtl8712u.bin

Look at lsusb:

Bus 001 Device 011: ID 07d1:3303 D-Link System

and add an identifiers to detect D-link DWA-131 by simple patch:

diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c 
b/drivers/net/wireless/
index 71244a3..cf41fd7 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
@@ -296,6 +296,7 @@ static struct usb_device_id rtl8192c_usb_ids[] = {
         {RTL_USB_DEVICE(0x07aa, 0x0056, rtl92cu_hal_cfg)}, /*ATKK-Gemtek*/
         {RTL_USB_DEVICE(0x07b8, 0x8178, rtl92cu_hal_cfg)}, /*Funai 
-Abocom*/
         {RTL_USB_DEVICE(0x07b8, 0x8178, rtl92cu_hal_cfg)}, /*Abocom 
-Abocom*/
+       {RTL_USB_DEVICE(0x07d1, 0x3303, rtl92cu_hal_cfg)}, /*D-Link 
DWA-131*/
         {RTL_USB_DEVICE(0x2001, 0x3307, rtl92cu_hal_cfg)}, /*D-Link-Cameo*/
         {RTL_USB_DEVICE(0x2001, 0x3309, rtl92cu_hal_cfg)}, /*D-Link-Alpha*/
         {RTL_USB_DEVICE(0x2001, 0x330a, rtl92cu_hal_cfg)}, /*D-Link-Alpha*/

Then, remove staging driver, OFF/On device and adapter plugged into the 
USB bus:
root@gms:~# usb 1-2: new full speed USB device number 2 using at91_ohci

Load the driver:
root@gms:~# modprobe rtl8192cu
rtl8192cu: MAC address: 9a:f4:17:03:4d:61
rtl8192cu: Board Type 0
rtl8192cu: rx_max_size 15360, rx_urb_num 8, in_ep 1
usbcore: registered new interface driver rtl8192cu

dmesg says:
...
usb 1-2: new full speed USB device number 2 using at91_ohci
rtl8192cu: MAC address: 9a:f4:17:03:4d:61
rtl8192cu: Board Type 0
rtl8192cu: rx_max_size 15360, rx_urb_num 8, in_ep 1
ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
usbcore: registered new interface driver rtl8192cu
...

Then issue some commands:
root@gms:~# iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:off/any
           Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm
           Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
           Encryption key:off
           Power Management:on

root@gms:~# iw dev wlan0 scan
command failed: Network is down (-100)

root@gms:~# iw phy
Wiphy phy0
     Band 1:
         Capabilities: 0x1862
             HT20/HT40
             Static SM Power Save
             RX HT20 SGI
             RX HT40 SGI
             No RX STBC
             Max AMSDU length: 7935 bytes
             DSSS/CCK HT40
         Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
         Minimum RX AMPDU time spacing: 16 usec (0x07)
         HT TX/RX MCS rate indexes supported: 0-7, 32
         Frequencies:
             * 2412 MHz [1] (20.0 dBm)
             * 2417 MHz [2] (20.0 dBm)
             * 2422 MHz [3] (20.0 dBm)
             * 2427 MHz [4] (20.0 dBm)
             * 2432 MHz [5] (20.0 dBm)
             * 2437 MHz [6] (20.0 dBm)
             * 2442 MHz [7] (20.0 dBm)
             * 2447 MHz [8] (20.0 dBm)
             * 2452 MHz [9] (20.0 dBm)
             * 2457 MHz [10] (20.0 dBm)
             * 2462 MHz [11] (20.0 dBm)
             * 2467 MHz [12] (20.0 dBm)
             * 2472 MHz [13] (20.0 dBm)
             * 2484 MHz [14] (disabled)
         Bitrates (non-HT):
             * 1.0 Mbps
             * 2.0 Mbps
             * 5.5 Mbps
             * 11.0 Mbps
             * 6.0 Mbps
             * 9.0 Mbps
             * 12.0 Mbps
             * 18.0 Mbps
             * 24.0 Mbps
             * 36.0 Mbps
             * 48.0 Mbps
             * 54.0 Mbps
     max # scan SSIDs: 4
     max scan IEs length: 2257 bytes
     RTS threshold: 2347
     Coverage class: 0 (up to 0m)
     Supported interface modes:
          * IBSS
          * managed
          * monitor
     Supported commands:
          * new_interface
          * set_interface
          * new_key
          * new_beacon
          * new_station
          * set_bss
          * authenticate
          * associate
          * deauthenticate
          * disassociate
          * join_ibss
          * remain_on_channel
          * set_tx_bitrate_mask
          * action
          * Unknown command (67)
          * set_wiphy_netns
          * set_channel
          * Unknown command (66)
          * connect
          * disconnect

root@gms:~# iw dev wlan0 link
Not connected.

I try to reconfigure network interfaces by next command:
...
root@gms:~# /etc/init.d/networking restart
Reconfiguring network interfaces... dhcpcd[1784]: dhcpcd not running
ifdown: warning: no dhcp clients found and stopped
dhcpcd[1790]: sending signal 1 to pid 1669
dhcpcd[1790]: waiting for pid 1669 to exit
eth0: link down
WPA: Configuring Interface
...

Everything stops here and nothing happened.

Please, help me to resolve this issue.

P.S.: Adapter does not blinks by LED at all with rtl8192cu driver.

Best regards!
--
Igor Plyatov