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WL1273 BT Wifi interaction

Found an interaction between BT and Wifi.  Streaming music to an a2dp headset. Turn on Wifi. The music  is interrupted for a second.  Trace down to the avdtp_write, it took more than 1.4s to send one of the packet. BT use a different link than the Wifi. Is it because of the Wifi fw downloading, initialize that cause the BT interruption. Inside the Wl1273, does it has one processor to handle the BT and Wifi? Anything that we could do to mitigate the issue.