ath5k: correct ath5k signal quality

This adjusts ath5k's signal quality reporting taking into
consideration received beacons at an RSSI of 35 should indicate
you can use of 54 Mbps on a single stream card (all ath5k cards)
reliably.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index c98380845fa7..b1e9a47c1c55 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -1778,7 +1778,17 @@ accept:
 
                 rxs.noise = sc->ah->ah_noise_floor;
                 rxs.signal = rxs.noise + rs.rs_rssi;
-                rxs.qual = rs.rs_rssi * 100 / 64;
+
+                /* An rssi of 35 indicates you should be able use
+                 * 54 Mbps reliably. A more elaborate scheme can be used
+                 * here but it requires a map of SNR/throughput for each
+                 * possible mode used */
+                rxs.qual = rs.rs_rssi * 100 / 35;
+
+                /* rssi can be more than 35 though, anything above that
+                 * should be considered at 100% */
+                if (rxs.qual > 100)
+                        rxs.qual = 100;
 
                 rxs.antenna = rs.rs_antenna;
                 rxs.rate_idx = ath5k_hw_to_driver_rix(sc, rs.rs_rate);