qcacld-3.0: Add support to retry gpio sync for capturing tsf

When the chip is power save mode it misses the gpio strobe
from the host platform. The TSF is not latched is not latched
in this case. As a result the reported TSF in the
WMI_VDEV_TSF_REPORT_EVENTID is not correct.

Fix this by adding a retry mechnism when the reported TSF is not proper.

Change-Id: Ica2d5c796e9d021b65e898ee3defe88d62183911

core/hdd/inc/wlan_hdd_main.h

@@ -1182,6 +1182,8 @@ struct hdd_adapter {
 	uint64_t last_target_time;
 	/* to store the count of continuous invalid tstamp-pair */
 	int continuous_error_count;
+	/* to store the count of continuous capture retry */
+	int continuous_cap_retry_count;
 	/* to indicate whether tsf_sync has been initialized */
 	qdf_atomic_t tsf_sync_ready_flag;
 #ifdef WLAN_FEATURE_TSF_PLUS_EXT_GPIO_SYNC

core/hdd/src/wlan_hdd_tsf.c

@@ -310,6 +310,24 @@ uint64_t hdd_get_monotonic_host_time(struct hdd_context *hdd_ctx)
 
 #if defined(WLAN_FEATURE_TSF_PLUS) && \
 	defined(WLAN_FEATURE_TSF_PLUS_EXT_GPIO_SYNC)
+#define MAX_CONTINUOUS_RETRY_CNT 10
+static uint32_t
+hdd_wlan_retry_tsf_cap(struct hdd_adapter *adapter)
+{
+	struct hdd_context *hddctx;
+	int count = adapter->continuous_cap_retry_count;
+
+	hddctx = WLAN_HDD_GET_CTX(adapter);
+	if (count == MAX_CONTINUOUS_RETRY_CNT) {
+		hdd_debug("Max retry countr reached");
+		return 0;
+	}
+	qdf_atomic_set(&hddctx->cap_tsf_flag, 0);
+	count++;
+	adapter->continuous_cap_retry_count = count;
+	return (count * WLAN_HDD_CAPTURE_TSF_REQ_TIMEOUT_MS);
+}
+
 static void
 hdd_update_host_time(struct hdd_adapter *adapter)
 {
@@ -395,6 +413,12 @@ static bool hdd_tsf_cap_sync_send(struct hdd_adapter *adapter)
 }
 #elif defined(WLAN_FEATURE_TSF_PLUS) && \
 	!defined(WLAN_FEATURE_TSF_PLUS_EXT_GPIO_SYNC)
+static uint32_t
+hdd_wlan_retry_tsf_cap(struct hdd_adapter *adapter)
+{
+	return 0;
+}
+
 static void
 hdd_tsf_gpio_sync_work_init(struct hdd_adapter *adapter)
 {
@@ -1066,6 +1090,7 @@ static void hdd_update_timestamp(struct hdd_adapter *adapter)
 			    CAP_TSF_TIMER_FIX_SEC) * MSEC_PER_SEC;
 
 		adapter->continuous_error_count = 0;
+		adapter->continuous_cap_retry_count = 0;
 		hdd_debug("ts-pair updated: interval: %d",
 			  interval);
 		break;
@@ -1220,12 +1245,16 @@ static void hdd_update_timestamp(struct hdd_adapter *adapter,
 		}
 
 		adapter->continuous_error_count = 0;
+		adapter->continuous_cap_retry_count = 0;
 		hdd_debug("ts-pair updated: interval: %d",
 			  interval);
 		break;
 	case HDD_TS_STATUS_WAITING:
 		interval = 0;
 		hdd_warn("TS status is waiting due to one or more pair not updated");
+
+		if (!target_time && !host_time)
+			interval = hdd_wlan_retry_tsf_cap(adapter);
 		break;
 	}
 	qdf_spin_unlock_bh(&adapter->host_target_sync_lock);