iwlwifi: rs-fw: support dcm

Add flags to the tlc_cfg_cmd for signaling peer support for receiving
Dual Carrier Modulation at BPSK (MCS 0), and set them according to peer
capabilities.
Signed-off-by: Naftali Goldstein <naftali.goldstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/api/rs.h

@@ -71,11 +71,19 @@
  * @IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK: enable LDPC
  * @IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK: enable STBC in HE at 160MHz
  *					      bandwidth
+ * @IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK: enable HE Dual Carrier Modulation
+ *					    for BPSK (MCS 0) with 1 spatial
+ *					    stream
+ * @IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK: enable HE Dual Carrier Modulation
+ *					    for BPSK (MCS 0) with 2 spatial
+ *					    streams
  */
 enum iwl_tlc_mng_cfg_flags {
 	IWL_TLC_MNG_CFG_FLAGS_STBC_MSK			= BIT(0),
 	IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK			= BIT(1),
 	IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK	= BIT(2),
+	IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK		= BIT(3),
+	IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK		= BIT(4),
 };
 
 /**

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

@@ -143,6 +143,16 @@ static u16 rs_fw_set_config_flags(struct iwl_mvm *mvm,
 	     (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))))
 		flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
 
+	if (he_cap && he_cap->has_he &&
+	    (he_cap->he_cap_elem.phy_cap_info[3] &
+	     IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_TX_MASK)) {
+		flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK;
+
+		if (he_cap->he_cap_elem.phy_cap_info[3] &
+		    IEEE80211_HE_PHY_CAP3_DCM_MAX_TX_NSS_2)
+			flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK;
+	}
+
 	return flags;
 }