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authorLuis R. Rodriguez <lrodriguez@atheros.com>2008-10-13 14:08:09 -0700
committerJohn W. Linville <linville@tuxdriver.com>2008-10-31 19:00:20 -0400
commitc49d154a800c55b8948e6d34563e593b500b31b9 (patch)
tree3af13e2b6d95afffb067e7577dd79c20254c6872
parent4fe0657ed41590ea4c2d4920c76836cb4a483caf (diff)
ath9k: correct signal quality report
This adjusts ath9k's signal quality reporting taking into consideration received beacons at an RSSI of 45 should indicate you can use of MCS 15 rate (144 Mbps) reliably on dual stream card. Keep in mind mac80211 does not yet have aggregation fixed but this should still provide more accurate results. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/ath9k/main.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 7555c341338..32acaf7ff62 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -279,8 +279,15 @@ static void ath9k_rx_prepare(struct ath_softc *sc,
rx_status->rate_idx = ath_rate2idx(sc, (status->rateKbps / 100));
rx_status->antenna = status->antenna;
- /* XXX Fix me, 64 cannot be the max rssi value, rigure it out */
- rx_status->qual = status->rssi * 100 / 64;
+ /* at 45 you will be able to use MCS 15 reliably. A more elaborate
+ * scheme can be used here but it requires tables of SNR/throughput for
+ * each possible mode used. */
+ rx_status->qual = status->rssi * 100 / 45;
+
+ /* rssi can be more than 45 though, anything above that
+ * should be considered at 100% */
+ if (rx_status->qual > 100)
+ rx_status->qual = 100;
if (status->flags & ATH_RX_MIC_ERROR)
rx_status->flag |= RX_FLAG_MMIC_ERROR;