From mboxrd@z Thu Jan  1 00:00:00 1970
From: sandeep suresh <sandeep.suresh@yahoo.co.in>
Date: Thu, 4 Apr 2013 23:19:49 +0800 (SGT)
Subject: [ath9k-devel] AR9287 ; 2-wire coexistence expected behavior
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	<515A0847.7000306@gmail.com>
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Hello All,
????I started using the "default" 2-wire coexistence without making any changes in ath9k driver for AR9287. First executed "modprobe ath9k btcoex_enable = 1".I used some print statements and came to know that 2-wire initialization (ath9k_hw_btcoex_init_2wire()) and 2-wire enable? (ath9k_hw_btcoex_enable_2wire())routines were executed.
?
My understanding on 2-wire coex: Please correct me if I am wrong. When WLAN activitiy (Tx or Rx; AR9287 is 2 x 2 MIMO) is in progress, WLAN_ACTIVE is asserted. If Bluetooth wants to transmit any packets, than BT_ACTIVE line has to be asserted (pull high). Then WLAN should buffer any transmissions (however there can be receptions/ACK) and allow Bluetooth to transmit packets. AR9287 stops transmission when BT_ACTIVE is true.
?
Based on the following code snippet, from hw.c:
?
if (common->btcoex_enabled) {
??if (AR_SREV_9300_20_OR_LATER(ah)) {
???btcoex_hw->scheme = ATH_BTCOEX_CFG_3WIRE;
???btcoex_hw->btactive_gpio = ATH_BTACTIVE_GPIO_9300;
???btcoex_hw->wlanactive_gpio = ATH_WLANACTIVE_GPIO_9300;
???btcoex_hw->btpriority_gpio = ATH_BTPRIORITY_GPIO_9300;
??} else if (AR_SREV_9280_20_OR_LATER(ah)) {
???btcoex_hw->btactive_gpio = ATH_BTACTIVE_GPIO_9280;
???btcoex_hw->wlanactive_gpio = ATH_WLANACTIVE_GPIO_9280;
???if (AR_SREV_9285(ah)) {
????btcoex_hw->scheme = ATH_BTCOEX_CFG_3WIRE;
????btcoex_hw->btpriority_gpio =
??????ATH_BTPRIORITY_GPIO_9285;
???} else {
????btcoex_hw->scheme = ATH_BTCOEX_CFG_2WIRE;
???}
??}
?} else {
??btcoex_hw->scheme = ATH_BTCOEX_CFG_NONE;
?}
?
I understand that ATH_BTCOEX_CFG_2_WIRE, ATH_BTACTIVE_GPIO_9280 (GPIO6 as per btcoex.h) and ATH_WLANACTIVE_GPIO_9280 (GPIO5 as per btcoex.h) are used. 
?
I next started monitoring GPIO5 on?oscillaoscope to?see WLAN activity and I could see a lot of pulse trains. Next in order to simulate high priority BT traffic, I pulled the line GPIO6 high. But I did not see any change in WLAN activity as I could continue to see the pulse trains. My expectation was that there should not be any WLAN activity and hence no pulses. Please guide if I am missing anything?
?
Thanks & regards
Sandeep
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