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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>
This commit is contained in:
Wey-Yi Guy 2012-05-03 14:22:02 -07:00 committed by John W. Linville
parent dd551ab7b4
commit 83ce21de68
2 changed files with 27 additions and 1 deletions
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22
drivers/net/wireless/iwlwifi/iwl-agn-lib.c
View File

@ -274,9 +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;
/*
@ -590,6 +601,15 @@ 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)
{

6
drivers/net/wireless/iwlwifi/iwl-commands.h
View File

@ -1910,6 +1910,8 @@ enum iwl_bt_kill_idx {
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 @@ struct iwl_basic_bt_cmd {
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;