[PATCH] Per chain RSSI reporting

[Norik Dzhandzhapanyan]

Add support for per chain RSSI reporting w/smoothing.

Signed-off-by: Norik Dzhandzhapanyan norikd at ethertronics.com


--- htt_rx.c.orig  2017-05-26 15:26:37.918504255 -0700
+++ htt_rx.c        2017-05-26 12:10:33.139809025 -0700
@@ -825,14 +825,71 @@ static bool ath10k_htt_rx_h_channel(stru
              return true;
}

+/*
+ * Signal data is somewhat glitchy. We smooth it out here with
+ * a 16 point moving average by storing samples in a buffer.
+ * As new samples come in, remove the oldest and add the newest
+ * to the running sum.  Avoids changes/impact to other generic averaging.
+ */
+
+/* Moving average buffer */
+#define MA_SAMPLES (16)
+
+struct ma_buffer
+{
+             int count;
+             int head;
+             int tail;
+             int sum;
+             int samps[MA_SAMPLES];
+};
+
+struct ma_buffer ma_buffers[IEEE80211_MAX_CHAINS] = {{ 0 }};
+
+static int ath_cb_moving_average(struct ma_buffer *mb, int8_t samp)
+{
+             if (mb->count < MA_SAMPLES) {
+                            mb->count++;
+                            mb->sum += samp;
+                            mb->tail = 0;
+             } else {
+                            int oldest = mb->samps[mb->tail];
+                            mb->tail = (mb->head == MA_SAMPLES - 1) ? 0 : mb->head + 1;
+                            mb->sum = mb->sum - oldest + samp;
+             }
+
+             mb->samps[mb->head] = samp;
+             mb->head = (mb->head == MA_SAMPLES - 1) ? 0 : mb->head + 1;
+
+             return (mb->sum / mb->count);
+}
+
static void ath10k_htt_rx_h_signal(struct ath10k *ar,
                                                              struct ieee80211_rx_status *status,
                                                              struct htt_rx_desc *rxd)
{
-              /* FIXME: Get real NF */
-              status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
-                                            rxd->ppdu_start.rssi_comb;
-              status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
+    int i;
+
+    for(i=0;i<IEEE80211_MAX_CHAINS;i++)
+    {
+        status->chains &= ~BIT(i);
+
+        if (rxd->ppdu_start.rssi_chains[i].pri20_mhz != 0x80)
+        {
+            int8_t rssi = ATH10K_DEFAULT_NOISE_FLOOR +
+                rxd->ppdu_start.rssi_chains[i].pri20_mhz;
+
+            status->chains |= BIT(i);
+
+            /* Compute the moving average of rssi */
+                                status->chain_signal[i] = ath_cb_moving_average(&ma_buffers[i], rssi);
+        }
+    }
+
+    /* FIXME: Get real NF */
+    status->signal = ATH10K_DEFAULT_NOISE_FLOOR +
+        rxd->ppdu_start.rssi_comb;
+    status->flag &= ~RX_FLAG_NO_SIGNAL_VAL;
}

 static void ath10k_htt_rx_h_mactime(struct ath10k *ar,
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