From dc574e526381ddcc7e5103ca091fd93c29129c6d Mon Sep 17 00:00:00 2001 From: Eyal Shapira Date: Wed, 17 Sep 2014 13:56:29 +0300 Subject: [PATCH] iwlwifi: rs: option to easily disable Tx MIMO The current TLC isn't optimized for low latency and some devices have issues with MIMO. This kind of combo creates latency issues. Allow to temporarily disable MIMO for tests in order to solve the latency issues without the added complexity of MIMO. Signed-off-by: Eyal Shapira Signed-off-by: Arik Nemtsov Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/constants.h | 1 + drivers/net/wireless/iwlwifi/mvm/rs.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/mvm/constants.h b/drivers/net/wireless/iwlwifi/mvm/constants.h index d4dfbe4cb66d..dfec5b5e7e14 100644 --- a/drivers/net/wireless/iwlwifi/mvm/constants.h +++ b/drivers/net/wireless/iwlwifi/mvm/constants.h @@ -95,5 +95,6 @@ #define IWL_MVM_FW_MCAST_FILTER_PASS_ALL 0 #define IWL_MVM_QUOTA_THRESHOLD 8 #define IWL_MVM_RS_RSSI_BASED_INIT_RATE 0 +#define IWL_MVM_RS_DISABLE_MIMO 0 #endif /* __MVM_CONSTANTS_H */ diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c index 18a539999580..0d836fe67e83 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -2684,6 +2684,9 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, lq_sta->ldpc = true; } + if (IWL_MVM_RS_DISABLE_MIMO) + lq_sta->active_mimo2_rate = 0; + lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate, BITS_PER_LONG); lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate, -- 2.20.1