wl1271: Optimize scan duration

Currently then dwell times for each channel in scans is set to an overly
long value, and excessive number of probe-requests are transmitted on each
channel (for active scans.)

Based on testing, comparable results can be received with smaller dwell-time,
and, with fever probe-requests - in fact, reducing the number of probe-requests
to 2 seems to increase the number of found results.

Configure more optimal values for per channel dwell times. Comparison for the
different scan configurations (in my current office environment):

dwell-time 60000   3x probe-req == ~60 results
           40000   3x probe-req == ~50 results
           30000   3x probe-req == ~40 results

dwell-time 60000   2x probe-req == ~70 results
           40000   2x probe-req == ~60 results
           30000   2x probe-req == ~58 results

The above are results for a cumulative 3 scan run. For individual scans, the
number of results drop slightly more.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_conf.h b/drivers/net/wireless/wl12xx/wl1271_conf.h
index feb493ebe5bd..ab716f517553 100644
--- a/drivers/net/wireless/wl12xx/wl1271_conf.h
+++ b/drivers/net/wireless/wl12xx/wl1271_conf.h
@@ -1016,6 +1016,44 @@ struct conf_roam_trigger_settings {
         u8 avg_weight_snr_data;
 };
 
+struct conf_scan_settings {
+        /*
+         * The minimum time to wait on each channel for active scans
+         *
+         * Range: 0 - 65536 tu
+         */
+        u16 min_dwell_time_active;
+
+        /*
+         * The maximum time to wait on each channel for active scans
+         *
+         * Range: 0 - 65536 tu
+         */
+        u16 max_dwell_time_active;
+
+        /*
+         * The maximum time to wait on each channel for passive scans
+         *
+         * Range: 0 - 65536 tu
+         */
+        u16 min_dwell_time_passive;
+
+        /*
+         * The maximum time to wait on each channel for passive scans
+         *
+         * Range: 0 - 65536 tu
+         */
+        u16 max_dwell_time_passive;
+
+        /*
+         * Number of probe requests to transmit on each active scan channel
+         *
+         * Range: u8
+         */
+        u16 num_probe_reqs;
+
+};
+
 struct conf_drv_settings {
         struct conf_sg_settings sg;
         struct conf_rx_settings rx;
@@ -1024,6 +1062,7 @@ struct conf_drv_settings {
         struct conf_itrim_settings itrim;
         struct conf_pm_config_settings pm_config;
         struct conf_roam_trigger_settings roam_trigger;
+        struct conf_scan_settings scan;
 };
 
 #endif