wifi: ath11k: Set ext passive scan flag to adjust passive scan start time

Set the WMI_SCAN_FLAG_EXT_PASSIVE_SCAN_START_TIME_ENHANCE flag
while sending the scan command.  If this flag is enabled when the
incoming scan request comes with a strict start time and its duration
overlaps with next TBTT, then target adjust the start time accordingly
for passive scan. Target supporting this feature will advertise
WMI_TLV_SERVICE_PASSIVE_SCAN_START_TIME_ENHANCE.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01467-QCAHKSWPL_SILICONZ-1
Signed-off-by: Tamizh Chelvam Raja <quic_tamizhr@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20221222131720.11368-1-quic_tamizhr@quicinc.com

drivers/net/wireless/ath/ath11k/wmi.c

@@ -2068,6 +2068,12 @@ void ath11k_wmi_start_scan_init(struct ath11k *ar,
 				  WMI_SCAN_EVENT_FOREIGN_CHAN |
 				  WMI_SCAN_EVENT_DEQUEUED;
 	arg->scan_flags |= WMI_SCAN_CHAN_STAT_EVENT;
+
+	if (test_bit(WMI_TLV_SERVICE_PASSIVE_SCAN_START_TIME_ENHANCE,
+		     ar->ab->wmi_ab.svc_map))
+		arg->scan_ctrl_flags_ext |=
+			WMI_SCAN_FLAG_EXT_PASSIVE_SCAN_START_TIME_ENHANCE;
+
 	arg->num_bssid = 1;
 
 	/* fill bssid_list[0] with 0xff, otherwise bssid and RA will be
@@ -2149,6 +2155,8 @@ ath11k_wmi_copy_scan_event_cntrl_flags(struct wmi_start_scan_cmd *cmd,
 	/* for adaptive scan mode using 3 bits (21 - 23 bits) */
 	WMI_SCAN_SET_DWELL_MODE(cmd->scan_ctrl_flags,
 				param->adaptive_dwell_time_mode);
+
+	cmd->scan_ctrl_flags_ext = param->scan_ctrl_flags_ext;
 }
 
 int ath11k_wmi_send_scan_start_cmd(struct ath11k *ar,

drivers/net/wireless/ath/ath11k/wmi.h

@@ -2093,6 +2093,7 @@ enum wmi_tlv_service {
 	WMI_TLV_SERVICE_EXT2_MSG = 220,
 	WMI_TLV_SERVICE_PEER_POWER_SAVE_DURATION_SUPPORT = 246,
 	WMI_TLV_SERVICE_SRG_SRP_SPATIAL_REUSE_SUPPORT = 249,
+	WMI_TLV_SERVICE_PASSIVE_SCAN_START_TIME_ENHANCE = 263,
 
 	/* The second 128 bits */
 	WMI_MAX_EXT_SERVICE = 256,
@@ -3223,6 +3224,7 @@ struct  wmi_start_scan_cmd {
 
 #define WMI_SCAN_DWELL_MODE_MASK 0x00E00000
 #define WMI_SCAN_DWELL_MODE_SHIFT        21
+#define WMI_SCAN_FLAG_EXT_PASSIVE_SCAN_START_TIME_ENHANCE   0x00000800
 
 enum {
 	WMI_SCAN_DWELL_MODE_DEFAULT      = 0,
@@ -3270,6 +3272,7 @@ struct scan_req_params {
 		};
 		u32 scan_events;
 	};
+	u32 scan_ctrl_flags_ext;
 	u32 dwell_time_active;
 	u32 dwell_time_active_2g;
 	u32 dwell_time_passive;