ath10k: set channel by command "iw" not from hostapd and DFS support of firmware-2.bin_10.1.467.2-1

[Vu Hai NGUYEN]

>Nope, CAC time is not required to start CAC (in case cac == 0 kernel
>will use default value 60s).
>What error you have EBUSY or EINVAL?
>What system (PC kernel, wireless ...) configuration?

Sorry I don't know how to detect if the error is EBUSY or EINVAL, Can you give me a more detail please? :D . I just get this debug message:

wlan0: interface state COUNTRY_UPDATE->DFS                                     
wlan0: DFS-CAC-START freq=5260 chan=52 sec_chan=0                              
wlan0: Unable to setup interface.  
ADDRCONF(NETDEV_UP): wlan0: link is not ready    

My PC kernel is 3.2.36 (provided from Marvell for Marvell ARMADA 370 chipset). I built ath10k from backport v-3.15 and using folder driver/net/wireless/ath from the master branch of ath10k. 
Here is the configuration in my hostapd.conf:

interface=wlan0
driver=nl80211
bridge=br0
country_code=FR
ieee80211d=1
ieee80211h=1
hw_mode=a
ieee80211n=1
ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40][SMPS-STATIC][TX-STBC][RX-STBC1][MAX-AMSDU-7935][DSSS_CCK-40]
channel=52
rts_threshold=2347
beacon_int=100
wmm_enabled=1

NGUYEN Vu Hai
Acita-Sodielec
Route de Mayres - B.P. 9
12100 St GEORGES DE LUZENCON
FRANCE