iwlwifi: add documentation for bt reduced tx power
Change-Id: Ia6294d651dcffdcaf8b62e67bcef52bd8c158dea
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Reviewed-on: http://git-mwg.jer.intel.com/gerrit/1947
Tested-by: Jenkins
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 9d88565..cb4b31f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -274,9 +274,20 @@
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;
/*
@@ -590,6 +601,15 @@
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)
{
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 83a6930..2813a0a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -1910,6 +1910,8 @@
IWLAGN_BT_VALID_REDUCED_TX_PWR | \
IWLAGN_BT_VALID_3W_LUT)
+#define IWLAGN_BT_REDUCED_TX_PWR BIT(0)
+
#define IWLAGN_BT_DECISION_LUT_SIZE 12
struct iwl_basic_bt_cmd {
@@ -1923,6 +1925,10 @@
u8 bt3_timer_t2_value;
__le16 bt4_reaction_time; /* unused */
__le32 bt3_lookup_table[IWLAGN_BT_DECISION_LUT_SIZE];
+ /*
+ * bit 0: use reduced tx power for control frame
+ * bit 1 - 7: reserved
+ */
u8 reduce_txpower;
u8 reserved;
__le16 valid;