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iwlwifi: use only one chain for scan in PS

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When doing scan in power saving mode, choose only 1 valid RX chain instead of
turning all chains on.

Signed-off-by: Shanyu Zhao <shanyu.zhao@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Shanyu Zhao 2009-11-06 14:52:47 -08:00 committed by John W. Linville
parent a643565efc
commit f1e3d7d428
1 changed files with 15 additions and 1 deletions
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16
drivers/net/wireless/iwlwifi/iwl-scan.c
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@ -581,6 +581,7 @@ static void iwl_bg_request_scan(struct work_struct *data)
u8 rate;
bool is_active = false;
int chan_mod;
u8 active_chains;
conf = ieee80211_get_hw_conf(priv->hw);
@ -734,9 +735,22 @@ static void iwl_bg_request_scan(struct work_struct *data)
rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
/* In power save mode use one chain, otherwise use all chains */
if (test_bit(STATUS_POWER_PMI, &priv->status)) {
/* rx_ant has been set to all valid chains previously */
active_chains = rx_ant &
((u8)(priv->chain_noise_data.active_chains));
if (!active_chains)
active_chains = rx_ant;
IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
priv->chain_noise_data.active_chains);
rx_ant = first_antenna(active_chains);
}
/* MIMO is not used here, but value is required */
rx_chain |= ANT_ABC << RXON_RX_CHAIN_VALID_POS;
rx_chain |= ANT_ABC << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
scan->rx_chain = cpu_to_le16(rx_chain);