qcacld-3.0: shrink SAP bw to 20M for unsafe

SAP sets up on 5180/20Mhz, freq 5180 becomes unsafe, channel
switch from 5180/20Mhz to 5200/20Mhz. Then STA connects to
5180, channel switch from 5200/20Mhz to 5180/80Mhz because of
CONCURRENT_STA_CHANGED_CHANNEL. Then STA is disconnect and
causes channel witch from 5180/80Mhz to 5200/80Mhz. This overlaps
the unsafe channel.

To resovle this issue, check the unsafe channels when csa reason
is unsafe channel.

Change-Id: I476d3a0b998e3bdceda6e388329158a7ec95c63b
CRs-Fixed: 3136637

components/cmn_services/policy_mgr/inc/wlan_policy_mgr_api.h

@@ -678,6 +678,19 @@ QDF_STATUS policy_mgr_change_mcc_go_beacon_interval(
 		uint8_t vdev_id, enum QDF_OPMODE dev_mode);
 
 #if defined(FEATURE_WLAN_MCC_TO_SCC_SWITCH)
+/**
+ * policy_mgr_check_bw_with_unsafe_chan_freq() - valid SAP channel bw against
+ *                                               unsafe channel list
+ * @psoc: PSOC object information
+ * @center_freq: SAP channel center frequency
+ * @ch_width: SAP channel width
+ *
+ * Return: true if no unsafe channel fall in SAP channel bandwidth range,
+ *         false otherwise
+ */
+bool policy_mgr_check_bw_with_unsafe_chan_freq(struct wlan_objmgr_psoc *psoc,
+					       qdf_freq_t center_freq,
+					       enum phy_ch_width ch_width);
 /**
  * policy_mgr_change_sap_channel_with_csa() - Move SAP channel using (E)CSA
  * @psoc: PSOC object information

components/cmn_services/policy_mgr/src/wlan_policy_mgr_action.c

@@ -2527,20 +2527,9 @@ sap_restart:
 	}
 }
 
-/**
- * policy_mgr_check_bw_with_unsafe_chan_freq() - valid SAP channel bw against
- *						 unsafe channel list
- * @psoc: PSOC object information
- * @center_freq: SAP channel center frequency
- * @ch_width: SAP channel width
- *
- * Return: true if no unsafe channel fall in SAP channel bandwidth range,
- *	   false otherwise
- */
-static bool
-policy_mgr_check_bw_with_unsafe_chan_freq(struct wlan_objmgr_psoc *psoc,
-					  qdf_freq_t center_freq,
-					  enum phy_ch_width ch_width)
+bool policy_mgr_check_bw_with_unsafe_chan_freq(struct wlan_objmgr_psoc *psoc,
+					       qdf_freq_t center_freq,
+					       enum phy_ch_width ch_width)
 {
 	struct policy_mgr_psoc_priv_obj *pm_ctx;
 	uint32_t freq_start, freq_end, bw, i, unsafe_chan_freq;

core/hdd/src/wlan_hdd_hostapd.c

@@ -3656,6 +3656,17 @@ sap_restart:
 		wlansap_get_csa_chanwidth_from_phymode(
 					sap_context, intf_ch_freq,
 					&ch_params);
+
+	hdd_debug("mhz_freq_seg0: %d, ch_width: %d",
+		  ch_params.mhz_freq_seg0, ch_params.ch_width);
+	if (sap_context->csa_reason == CSA_REASON_UNSAFE_CHANNEL &&
+	    (!policy_mgr_check_bw_with_unsafe_chan_freq(hdd_ctx->psoc,
+							ch_params.mhz_freq_seg0,
+							ch_params.ch_width))) {
+		hdd_debug("SAP bw shrink to 20M for unsafe");
+		ch_params.ch_width = CH_WIDTH_20MHZ;
+	}
+
 	hdd_debug("SAP restart orig chan freq: %d, new freq: %d bw %d",
 		  hdd_ap_ctx->sap_config.chan_freq, intf_ch_freq,
 		  ch_params.ch_width);