commit 15a533c47f9ebb8dec8e440275136cbf9c493a1f
author Helmut Schaa <helmut.schaa@googlemail.com> Mon Apr 18 15:28:04 2011 +0200
committer John W. Linville <linville@tuxdriver.com> Tue Apr 19 15:39:19 2011 -0400
tree ffa8be5e0b67f2ce0ca128bd55630bb297361a27
parent 10e11568ca8b8a15f7478f6a4ceebabcbdba1018

rt2x00: Use correct TBTT_SYNC config in AP mode

This seems to fix problems with some powersaving clients since a
positive value in TBTT_SYNC_CFG_TBTT_ADJUST introduces beacon skew,
which is not wanted in AP mode.

Also update the rest of the TBTT_SYNC config according to the
legacy drivers in AP mode.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index c6f5584..e0fa559 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1245,6 +1245,25 @@
 		rt2800_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 		rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_SYNC, conf->sync);
 		rt2800_register_write(rt2x00dev, BCN_TIME_CFG, reg);
+
+		if (conf->sync == TSF_SYNC_AP_NONE) {
+			/*
+			 * Tune beacon queue transmit parameters for AP mode
+			 */
+			rt2800_register_read(rt2x00dev, TBTT_SYNC_CFG, &reg);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_CWMIN, 0);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_AIFSN, 1);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_EXP_WIN, 32);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_TBTT_ADJUST, 0);
+			rt2800_register_write(rt2x00dev, TBTT_SYNC_CFG, reg);
+		} else {
+			rt2800_register_read(rt2x00dev, TBTT_SYNC_CFG, &reg);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_CWMIN, 4);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_AIFSN, 2);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_BCN_EXP_WIN, 32);
+			rt2x00_set_field32(&reg, TBTT_SYNC_CFG_TBTT_ADJUST, 16);
+			rt2800_register_write(rt2x00dev, TBTT_SYNC_CFG, reg);
+		}
 	}
 
 	if (flags & CONFIG_UPDATE_MAC) {