iwlwifi: mvm: rs: fix TPC action decision algorithm

Decreasing Tx power is allowed only when success ratio is
above the threshold defined in the algorithm. Add this condition.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/rs.c

@@ -2040,7 +2040,8 @@ static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
 	}
 
 	/* try decreasing first if applicable */
-	if (weak != TPC_INVALID) {
+	if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
+	    weak != TPC_INVALID) {
 		if (weak_tpt == IWL_INVALID_VALUE &&
 		    (strong_tpt == IWL_INVALID_VALUE ||
 		     current_tpt >= strong_tpt)) {