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qcacmn: update average rssi in scan entry

Browse source 
If elapsed time since last rssi update for a particular
scan entry is smaller than a thresold, calculate a
running average of the RSSI values. Otherwise last RSSI
is more representive of the signal strength.

Change-Id: I4cbecc8b6bfbb73c272544114b063b25c26e14fe
CRs-Fixed: 1095299
This commit is contained in:
Om Prakash Tripathi 2017-04-18 18:51:20 +05:30 • committed by snandini
commit cdcbb39764
4 changed files with 27 additions and 7 deletions
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24
umac/scan/core/src/wlan_scan_cache_db.c
View file

@ -364,12 +364,11 @@ static void scm_delete_duplicate_entry(struct scan_dbs *scan_db,
struct scan_cache_node *scan_node)
{
struct scan_cache_entry *scan_entry;
uint64_t time_gap;
scan_entry = scan_node->entry;
/* If old entry have the ssid but new entry does not */
if (!scan_params->ssid.length && scan_entry->ssid.length) {
uint64_t time_gap;
/*
* New entry has a hidden SSID and old one has the SSID.
* Add the entry by using the ssid of the old entry
@ -397,9 +396,29 @@ static void scm_delete_duplicate_entry(struct scan_dbs *scan_db,
*/
if (scan_params->channel_mismatch) {
scan_params->rssi_raw = scan_entry->rssi_raw;
scan_params->avg_rssi = scan_entry->avg_rssi;
scan_params->rssi_timestamp =
scan_entry->rssi_timestamp;
} else {
/* If elapsed time since last rssi update for this
* entry is smaller than a thresold, calculate a
* running average of the RSSI values.
* Otherwise last RSSI is more representive of the
* signal strength.
*/
time_gap =
scan_entry->rssi_timestamp -
scan_params->rssi_timestamp;
if (time_gap > WLAN_RSSI_AVERAGING_TIME)
scan_params->avg_rssi =
WLAN_RSSI_IN(scan_params->rssi_raw);
else
WLAN_RSSI_LPF(scan_params->avg_rssi,
scan_params->rssi_raw);
scan_params->rssi_timestamp = scan_params->scan_entry_time;
}
/* copy wsn ie from scan_entry to scan_params*/
scm_update_alt_wcn_ie(scan_entry, scan_params);
@ -542,6 +561,7 @@ QDF_STATUS scm_handle_bcn_probe(struct scheduler_msg *msg)
goto free_nbuf;
}
scm_info("Received %s from BSSID: %pM tsf_delta = %u Seq Num: %x ssid:%.*s",
(bcn->frm_type == MGMT_SUBTYPE_PROBE_RESP) ?
"Probe Rsp" : "Beacon", scan_entry->bssid.bytes,

2
umac/scan/dispatcher/inc/wlan_scan_public_structs.h
View file

@ -247,7 +247,7 @@ struct scan_cache_entry {
struct wlan_ssid ssid;
uint16_t seq_num;
enum wlan_phymode phy_mode;
int8_t avg_rssi;
int32_t avg_rssi;
int8_t rssi_raw;
uint16_t bcn_int;
union wlan_capability cap_info;

1
umac/scan/dispatcher/inc/wlan_scan_utils_api.h
View file

@ -181,6 +181,7 @@ util_scan_entry_reset_timestamp(struct scan_cache_entry *scan_entry)
/*
* Macros used for RSSI calculation.
*/
#define WLAN_RSSI_AVERAGING_TIME (5 * 1000) /* 5 seconds */
#define WLAN_RSSI_EP_MULTIPLIER (1<<7) /* pow2 to optimize out * and / */

7
umac/scan/dispatcher/src/wlan_scan_utils_api.c
View file

@ -575,6 +575,7 @@ util_scan_unpack_beacon_frame(uint8_t *frame,
(le16toh(*(uint16_t *)hdr->i_seq) >> WLAN_SEQ_SEQ_SHIFT);
scan_entry->rssi_raw = rx_param->rssi;
scan_entry->avg_rssi = WLAN_RSSI_DUMMY_MARKER;
scan_entry->tsf_delta = rx_param->tsf_delta;
/* store jiffies */
@ -593,10 +594,8 @@ util_scan_unpack_beacon_frame(uint8_t *frame,
bcn->timestamp, 8);
scan_entry->erp = ERP_NON_ERP_PRESENT;
scan_entry->rssi_timestamp =
scan_entry->scan_entry_time =
qdf_mc_timer_get_system_time();
scan_entry->scan_entry_time =
qdf_mc_timer_get_system_time();
scan_entry->raw_frame.len = frame_len;
qdf_mem_copy(scan_entry->raw_frame.ptr,