qcacld-3.0: Don't connect in 11ax if peer ldpc is disabled

Don't connect in HE mode if the AP operating in 2.4 GHz does not
support LDPC coding.
Also, some peers which operate on 2.4 ghz and don't support LDPC
coding, might satisfy the condtions which is used to force enable
ldpc coding bit. If this bit is set, the peer doesn't support ldpc,
it  might fail to connect.
To fix this, force enable ldpc coding only when peer is operating
in 5/6 Ghz along with the already existing conditions.

Change-Id: I4b424833bbf845de17acc0907e1098c0a01b3ee5
CRs-Fixed: 2760506

core/mac/src/pe/lim/lim_prop_exts_utils.c

@@ -320,6 +320,31 @@ static inline bool lim_extract_adaptive_11r_cap(uint8_t *ie, uint16_t ie_len)
 }
 #endif
 
+#ifdef WLAN_FEATURE_11AX
+static void lim_check_peer_ldpc_and_update(struct pe_session *session,
+				    tSirProbeRespBeacon *beacon_struct)
+{
+	if (session->he_capable &&
+	    WLAN_REG_IS_24GHZ_CH_FREQ(session->curr_op_freq) &&
+	    beacon_struct->he_cap.present &&
+	    !beacon_struct->he_cap.ldpc_coding) {
+		session->he_capable = false;
+		pe_err("LDPC check failed for HE operation");
+		if (session->vhtCapability) {
+			session->dot11mode = MLME_DOT11_MODE_11AC;
+			pe_debug("Update dot11mode to 11ac");
+		} else {
+			session->dot11mode = MLME_DOT11_MODE_11N;
+			pe_debug("Update dot11mode to 11N");
+		}
+	}
+}
+#else
+static void lim_check_peer_ldpc_and_update(struct pe_session *session,
+					   tSirProbeRespBeacon *beacon_struct)
+{}
+#endif
+
 void lim_extract_ap_capability(struct mac_context *mac_ctx, uint8_t *p_ie,
 			       uint16_t ie_len, uint8_t *qos_cap,
 			       uint8_t *uapsd, int8_t *local_constraint,
@@ -542,6 +567,7 @@ void lim_extract_ap_capability(struct mac_context *mac_ctx, uint8_t *p_ie,
 		}
 	}
 	lim_check_is_he_mcs_valid(session, beacon_struct);
+	lim_check_peer_ldpc_and_update(session, beacon_struct);
 	lim_extract_he_op(session, beacon_struct);
 	lim_update_he_bw_cap_mcs(session, beacon_struct);
 	/* Extract the UAPSD flag from WMM Parameter element */

core/mac/src/pe/lim/lim_utils.c

@@ -6793,9 +6793,10 @@ static void lim_check_and_force_he_ldpc_cap(struct pe_session *session,
 					    tDot11fIEhe_cap *he_cap)
 {
 	if (!he_cap->ldpc_coding &&
+	    !WLAN_REG_IS_24GHZ_CH_FREQ(session->curr_op_freq) &&
 	    (session->ch_width > CH_WIDTH_20MHZ ||
-	     lim_check_he_80_mcs11_supp(session, he_cap) ||
-	     lim_check_is_bss_greater_than_4_nss_supp(session, he_cap)))
+	    lim_check_he_80_mcs11_supp(session, he_cap) ||
+	    lim_check_is_bss_greater_than_4_nss_supp(session, he_cap)))
 		he_cap->ldpc_coding = 1;
 }