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Commit 83ce21de authored by Wey-Yi Guy's avatar Wey-Yi Guy Committed by John W. Linville
Browse files

iwlwifi: add documentation for bt reduced tx power 



Change-Id: Ia6294d651dcffdcaf8b62e67bcef52bd8c158dea
Signed-off-by: default avatarWey-Yi Guy <wey-yi.w.guy@intel.com>
Reviewed-on: http://git-mwg.jer.intel.com/gerrit/1947


Tested-by: Jenkins
Reviewed-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent dd551ab7

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

+21 −1
Original line number Diff line number Diff line
@@ -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)

{

drivers/net/wireless/iwlwifi/iwl-commands.h

+6 −0
Original line number Diff line number Diff line
@@ -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;