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ath9k bluetooth coexistence

ath9k supports Bluetooth coexistence under the 2-wire and 3-wire scheme. This section documents how this is supported and under what chipsets.

GPIO pin setup and configuration

Bluetooth coexistence on ath9k requires configuring the GPIO pins accordingly and setting up the coexistence scheme. The driver does this automatically upon module load as follows:

        if (AR_SREV_9280_10_OR_LATER(ah) &&
            ath9k_hw_btcoex_supported(ah)) {
                btcoex_hw->btactive_gpio = ATH_BTACTIVE_GPIO;
                btcoex_hw->wlanactive_gpio = ATH_WLANACTIVE_GPIO;

                if (AR_SREV_9285(ah)) {
                        btcoex_hw->scheme = ATH_BTCOEX_CFG_3WIRE;
                        btcoex_hw->btpriority_gpio = ATH_BTPRIORITY_GPIO;
                } else {
                        btcoex_hw->scheme = ATH_BTCOEX_CFG_2WIRE;
                }
        } else {
                btcoex_hw->scheme = ATH_BTCOEX_CFG_NONE;
        }

Bluetooth coexistence code

The code for Bluetooth coexistence is in the file btcoex.c

2-wire Bluetooth coexistence

This is supported and enabled on all devices >= AR9280 except AR9285. This is initialized via ath9k_hw_btcoex_init_2wire().

3-wire Bluetooth coexistence

This is supported and enabled on all AR9285 devices. This is initialized via ath9k_hw_btcoex_init_3wire().