qcacmn: Implement a light weight get_timestamp routine

For some 3rd party platforms, get_timestamp through legacy
kernel API is time costing. For spin_lock/unlock statistics
info, the resolution in ms level is enough. So use another
light weight API to save CPU resource for 3rd party
platforms only.

Change-Id: I9182f00adda0d3081a2c40b222ab37bb1ca9d6a1
CRs-Fixed: 2796263

qdf/inc/qdf_lock.h

@@ -90,13 +90,13 @@ do { \
 	uint64_t BEFORE_LOCK_time; \
 	uint64_t AFTER_LOCK_time;  \
 	bool BEFORE_LOCK_is_locked = was_locked; \
-	BEFORE_LOCK_time = qdf_get_log_timestamp(); \
+	BEFORE_LOCK_time = qdf_get_log_timestamp_lightweight(); \
 	do {} while (0)
 
 
 #define AFTER_LOCK(lock, func) \
 	lock->stats.acquired_by = func; \
-	AFTER_LOCK_time = qdf_get_log_timestamp(); \
+	AFTER_LOCK_time = qdf_get_log_timestamp_lightweight(); \
 	lock->stats.acquired++; \
 	lock->stats.last_acquired = AFTER_LOCK_time; \
 	if (BEFORE_LOCK_is_locked) { \
@@ -121,11 +121,11 @@ do { \
 do { \
 	uint64_t BEFORE_LOCK_time; \
 	uint64_t AFTER_LOCK_time;  \
-	BEFORE_LOCK_time = qdf_get_log_timestamp(); \
+	BEFORE_LOCK_time = qdf_get_log_timestamp_lightweight(); \
 	do {} while (0)
 
 #define AFTER_TRYLOCK(lock, trylock_return, func) \
-	AFTER_LOCK_time = qdf_get_log_timestamp(); \
+	AFTER_LOCK_time = qdf_get_log_timestamp_lightweight(); \
 	if (trylock_return) { \
 		lock->stats.acquired++; \
 		lock->stats.last_acquired = AFTER_LOCK_time; \
@@ -138,7 +138,7 @@ do { \
 /* max_hold_time in US */
 #define BEFORE_UNLOCK(lock, max_hold_time) \
 do {\
-	uint64_t held_time = qdf_get_log_timestamp() - \
+	uint64_t held_time = qdf_get_log_timestamp_lightweight() - \
 		lock->stats.last_acquired; \
 	lock->stats.held_time += held_time; \
 \

qdf/inc/qdf_time.h

@@ -281,6 +281,21 @@ static inline uint64_t qdf_log_timestamp_to_usecs(uint64_t time)
 
 	return time;
 }
+
+/**
+ * qdf_get_log_timestamp_lightweight - get time stamp for logging
+ * For adrastea this API returns QTIMER tick which is needed to synchronize
+ * host and fw log timestamps
+ * For ROME and other discrete solution this API returns system boot time stamp
+ *
+ * Return:
+ * QTIMER ticks(19.2MHz) for adrastea
+ * System tick for rome and other 3rd party platform solutions
+ */
+static inline uint64_t qdf_get_log_timestamp_lightweight(void)
+{
+	return __qdf_get_log_timestamp();
+}
 #else
 #define QDF_LOG_TIMESTAMP_UNIT KERNEL_LOG
 #define QDF_LOG_TIMESTAMP_CYCLES_PER_10_US 10
@@ -290,6 +305,14 @@ static inline uint64_t qdf_log_timestamp_to_usecs(uint64_t time)
 	/* timestamps are already in micro seconds */
 	return time;
 }
+
+static inline uint64_t qdf_get_log_timestamp_lightweight(void)
+{
+	uint64_t timestamp_us;
+
+	timestamp_us = __qdf_system_ticks_to_msecs(qdf_system_ticks()) * 1000;
+	return timestamp_us;
+}
 #endif /* end of MSM_PLATFORM */
 
 static inline void qdf_log_timestamp_to_secs(uint64_t time, uint64_t *secs,