Add support for per chain RSSI reporting w/smoothing.
Signed-off-by: Norik Dzhandzhapanyan [email protected]
--- 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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