diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-lib.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn-lib.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c index 01dc44267317..e55ec6c8a920 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c @@ -31,6 +31,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/sched.h> +#include <net/mac80211.h> #include "iwl-dev.h" #include "iwl-io.h" @@ -273,9 +274,20 @@ void iwlagn_send_advance_bt_config(struct iwl_priv *priv) return; } + /* + * Possible situations when BT needs to take over for receive, + * at the same time where STA needs to response to AP's frame(s), + * reduce the tx power of the required response frames, by that, + * allow the concurrent BT receive & WiFi transmit + * (BT - ANT A, WiFi -ANT B), without interference to one another + * + * Reduced tx power apply to control frames only (ACK/Back/CTS) + * when indicated by the BT config command + */ basic.kill_ack_mask = priv->kill_ack_mask; basic.kill_cts_mask = priv->kill_cts_mask; - basic.reduce_txpower = priv->reduced_txpower; + if (priv->reduced_txpower) + basic.reduce_txpower = IWLAGN_BT_REDUCED_TX_PWR; basic.valid = priv->bt_valid; /* @@ -589,13 +601,31 @@ static bool iwlagn_set_kill_msk(struct iwl_priv *priv, return need_update; } +/* + * Upon RSSI changes, sends a bt config command with following changes + * 1. enable/disable "reduced control frames tx power + * 2. update the "kill)ack_mask" and "kill_cts_mask" + * + * If "reduced tx power" is enabled, uCode shall + * 1. ACK/Back/CTS rate shall reduced to 6Mbps + * 2. not use duplciate 20/40MHz mode + */ static bool iwlagn_fill_txpower_mode(struct iwl_priv *priv, struct iwl_bt_uart_msg *uart_msg) { bool need_update = false; + struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; + int ave_rssi; + ave_rssi = ieee80211_ave_rssi(ctx->vif); + if (!ave_rssi) { + /* no rssi data, no changes to reduce tx power */ + IWL_DEBUG_COEX(priv, "no rssi data available\n"); + return need_update; + } if (!priv->reduced_txpower && !iwl_is_associated(priv, IWL_RXON_CTX_PAN) && + (ave_rssi > BT_ENABLE_REDUCED_TXPOWER_THRESHOLD) && (uart_msg->frame3 & (BT_UART_MSG_FRAME3ACL_MSK | BT_UART_MSG_FRAME3OBEX_MSK)) && !(uart_msg->frame3 & (BT_UART_MSG_FRAME3SCOESCO_MSK | @@ -606,13 +636,14 @@ static bool iwlagn_fill_txpower_mode(struct iwl_priv *priv, need_update = true; } else if (priv->reduced_txpower && (iwl_is_associated(priv, IWL_RXON_CTX_PAN) || + (ave_rssi < BT_DISABLE_REDUCED_TXPOWER_THRESHOLD) || (uart_msg->frame3 & (BT_UART_MSG_FRAME3SCOESCO_MSK | BT_UART_MSG_FRAME3SNIFF_MSK | BT_UART_MSG_FRAME3A2DP_MSK)) || !(uart_msg->frame3 & (BT_UART_MSG_FRAME3ACL_MSK | BT_UART_MSG_FRAME3OBEX_MSK)))) { /* disable reduced tx power */ priv->reduced_txpower = false; - priv->bt_valid &= ~IWLAGN_BT_VALID_REDUCED_TX_PWR; + priv->bt_valid |= IWLAGN_BT_VALID_REDUCED_TX_PWR; need_update = true; } |