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iwlwifi: fix rate-scaling algorithm for BT combo devices 

iwlwifi tries to avoid using antenna B in BT combo devices when BT
is active. A bug in the rate-scaling algorithm was causing the combo
device to never attempt MIMO rates. Fix the algorithm to
opportunistically try MIMO rates when BT traffic is low.

Signed-off-by: Meenakshi Venkataraman <meenakshi.venkataraman@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Venkataraman, Meenakshi 2011-11-10 06:55:25 -08:00 коммит произвёл John W. Linville
Родитель 81a3de1ce2
Коммит 383b0874ab
1 изменённых файлов: 2 добавлений и 6 удалений
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8
drivers/net/wireless/iwlwifi/iwl-agn-rs.c
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@ -1458,10 +1458,8 @@ static int rs_move_legacy_other(struct iwl_priv *priv,
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
valid_tx_ant =
first_antenna(hw_params(priv).valid_tx_ant);
if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
tbl->action = IWL_LEGACY_SWITCH_SISO;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
@ -1636,10 +1634,8 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
valid_tx_ant =
first_antenna(hw_params(priv).valid_tx_ant);
if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS: