iwlwifi: add bt full concurrency support

Adding the bluetooth full concurrency support for WiFi/BT combo devices.

Driver should configure uCode to operate in "full concurrency" mode (via
LUT) if both conditions are met:
 - Antenna Coupling is more than 35dB
 - WiFi Channel Inhibition Request is hornored by BT Core

Currently, there is no antenna coupling information provided by uCode;
use module parameter to specified the antenna coupling in dB.

When in "full concurrency" mode, driver need to download different LUT
to uCode while sending bt configuration command; also, driver need to
configure the device operate in 1x1 while in full concurrency mode.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 5e8fc720c570..13d2dcea85d1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -780,6 +780,10 @@ EXPORT_SYMBOL(iwl_set_rxon_ht);
  */
 static int iwl_get_active_rx_chain_count(struct iwl_priv *priv)
 {
+        if (priv->cfg->advanced_bt_coexist && priv->bt_full_concurrent) {
+                /* operated as 1x1 in full concurrency mode */
+                return IWL_NUM_RX_CHAINS_SINGLE;
+        }
         /* # of Rx chains to use when expecting MIMO. */
         if (is_single_rx_stream(priv))
                 return IWL_NUM_RX_CHAINS_SINGLE;
@@ -836,11 +840,16 @@ void iwl_set_rxon_chain(struct iwl_priv *priv)
          * Before first association, we assume all antennas are connected.
          * Just after first association, iwl_chain_noise_calibration()
          *    checks which antennas actually *are* connected. */
-         if (priv->chain_noise_data.active_chains)
+        if (priv->chain_noise_data.active_chains)
                 active_chains = priv->chain_noise_data.active_chains;
         else
                 active_chains = priv->hw_params.valid_rx_ant;
 
+        if (priv->cfg->advanced_bt_coexist && priv->bt_full_concurrent) {
+                /* operated as 1x1 in full concurrency mode */
+                active_chains = first_antenna(active_chains);
+        }
+
         rx_chain = active_chains << RXON_RX_CHAIN_VALID_POS;
 
         /* How many receivers should we use? */