iwlwifi: Tune radio to prevent unexpected behavior

We have seen the throughput dropped due to external noisy environment
and the radio is out of tune.  There are lot of plcp errors indicating
this condition. Eventually the station can get de-authenticated by the
Access Point.  By resetting and tuning the radio, the plcp errors are
reduced or eliminated and the throughput starts to rise.

To prevent unexpected behavior such as drop in throughput or deauthentication,
- The change provides the driver feature to monitor and tune the radio base on
the statistics notification from the uCode.
- It also allows the setting of the plcp error rate threshold via
the plcp_delta under debugfs interface.

Signed-off-by: Trieu 'Andrew' Nguyen <trieux.t.nguyen@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 6472910b72d4..764479f74c8b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -2830,6 +2830,7 @@ static struct iwl_cfg iwl3945_bg_cfg = {
 	.ht_greenfield_support = false,
 	.led_compensation = 64,
 	.broken_powersave = true,
+	.plcp_delta_threshold = IWL_MAX_PLCP_ERR_THRESHOLD_DEF,
 };
 
 static struct iwl_cfg iwl3945_abg_cfg = {
@@ -2847,6 +2848,7 @@ static struct iwl_cfg iwl3945_abg_cfg = {
 	.ht_greenfield_support = false,
 	.led_compensation = 64,
 	.broken_powersave = true,
+	.plcp_delta_threshold = IWL_MAX_PLCP_ERR_THRESHOLD_DEF,
 };
 
 struct pci_device_id iwl3945_hw_card_ids[] = {