problem AP on PCIe wifi module in qsdk-12.0-ipq60xx-5.4 image on Mango

[liviolima80]

Good morning,
I have a Mango board with an extra wifi module on PCIe connector. The wifi module is based on ath9k driver and is configure as AP.
Using the old qsdk-11.3-ipq60xx-4.4 image everything worked correctly.

After the upgrade to qsdk-12.0-ipq60xx-5.4, the AP does not work correctly. I can see that the wlan interface receive packets, for example from mobile phones trying to connect to the new AP, but it seems that the module have problem to push out the packets and it seems that the packets remains in output queue. This is the output of iw dev command during the connection phase from a mobile phone to the new AP

phy#2
Interface wlan2
ifindex 22
wdev 0x200000003
addr 18:fd:74:45:c0:6c
ssid OpenWrt-802.11p
type AP
channel 36 (5180 MHz), width: 20 MHz (no HT), center1: 5180 MHz
txpower 23.00 dBm
multicast TXQ:
qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets
76173 217 33 0 0 0 0 0 0

Attached is the modified build configuration, in order to enable ath9k driver

8dev_mango_enhanced_5_4_v2.zip