diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2014-05-12 11:14:51 +0200 |
|---|---|---|
| committer | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2014-05-13 15:06:44 +0300 |
| commit | 1a095d30d1a4aa6249715a92c20327f6b7cefb56 (patch) | |
| tree | 97494c5b89d9c2cbf2231bd00ef99fedd9e1c00b /drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c | |
| parent | d6aeb354f9c5bbbd89b636e889be918ed1441267 (diff) | |
| download | lwn-1a095d30d1a4aa6249715a92c20327f6b7cefb56.tar.gz lwn-1a095d30d1a4aa6249715a92c20327f6b7cefb56.zip | |
iwlwifi: mvm: enable RX chain diversity if needed
In some situations (see comment) it makes sense to enable both
chains (if available) to get better throughput by having chain
diversity available.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c index 4902f3b95479..acb79af6fa89 100644 --- a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c +++ b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c @@ -156,6 +156,19 @@ static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm, idle_cnt = chains_static; active_cnt = chains_dynamic; + /* In scenarios where we only ever use a single-stream rates, + * i.e. legacy 11b/g/a associations, single-stream APs or even + * static SMPS, enable both chains to get diversity, improving + * the case where we're far enough from the AP that attenuation + * between the two antennas is sufficiently different to impact + * performance. + */ + if (active_cnt == 1 && num_of_ant(mvm->fw->valid_rx_ant) > 1 && + !mvm->cfg->rx_with_siso_diversity) { + idle_cnt = 2; + active_cnt = 2; + } + cmd->rxchain_info = cpu_to_le32(mvm->fw->valid_rx_ant << PHY_RX_CHAIN_VALID_POS); cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS); |