iwlwifi: use the results from disconnected antenna algorithm

This patch makes usage of the results from disconnected antenna alg to
know how many antennas are connected.

It also synchronizes between the chain noise alg and the W/A that
disables power management during association. All the antennas must be
enables during the chain noise algorithm. Hence, power management is
restored only after the completion of the algorithm.

In the future, we will need to update the AP that we don't support MIMO
if there is only one antenna connected. We also need to update the rate
scaling algorithm.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-calib.c b/drivers/net/wireless/iwlwifi/iwl-calib.c
index 35fb4a4f737..72fbf47229d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-calib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-calib.c
@@ -808,13 +808,11 @@ void iwl_chain_noise_calibration(struct iwl_priv *priv,
                 }
         }
 
+        /* Save for use within RXON, TX, SCAN commands, etc. */
+        priv->chain_noise_data.active_chains = active_chains;
         IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
                         active_chains);
 
-        /* Save for use within RXON, TX, SCAN commands, etc. */
-        /*priv->valid_antenna = active_chains;*/
-        /*FIXME: should be reflected in RX chains in RXON */
-
         /* Analyze noise for rx balance */
         average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
         average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
@@ -839,6 +837,15 @@ void iwl_chain_noise_calibration(struct iwl_priv *priv,
 
         priv->cfg->ops->utils->gain_computation(priv, average_noise,
                 min_average_noise_antenna_i, min_average_noise);
+
+        /* Some power changes may have been made during the calibration.
+         * Update and commit the RXON
+         */
+        if (priv->cfg->ops->lib->update_chain_flags)
+                priv->cfg->ops->lib->update_chain_flags(priv);
+
+        data->state = IWL_CHAIN_NOISE_DONE;
+        iwl_power_enable_management(priv);
 }
 EXPORT_SYMBOL(iwl_chain_noise_calibration);