diff options
| author | Christian Lamparter <chunkeey@googlemail.com> | 2010-08-25 01:29:05 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-08-25 22:34:56 +0400 |
| commit | 45f7e3116fad77e6dd15cb0e2eaccb7de7b806c9 (patch) | |
| tree | bd1b652a84a8bf37eb941aa50719b3aab833ee60 /drivers/net/wireless/p54 | |
| parent | 2c15a0cf27a74213a714cc7be31685b841f7c1ac (diff) | |
| download | linux-45f7e3116fad77e6dd15cb0e2eaccb7de7b806c9.tar.xz | |
p54: better rssi->dbm conversion for longbow phys
This patch should fix the dodgy signal and noise value
reports for most longbow (p54spi) users:
e.g.: (an older tcpdump extract)
> 2.0 Mb/s 2437 MHz (0x00a0) -49dB signal -41dB noise
> 1.0 Mb/s 2437 MHz (0x00a0) 4dB signal -41dB noise
The formula is taken from stlc45xx:
http://gitorious.org/stlc45xx/mainline/blobs/master/stlc45xx.c#line1199
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/p54')
| -rw-r--r-- | drivers/net/wireless/p54/txrx.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c index 34447d1ad80d..8f67db487f57 100644 --- a/drivers/net/wireless/p54/txrx.c +++ b/drivers/net/wireless/p54/txrx.c @@ -275,15 +275,15 @@ static int p54_rssi_to_dbm(struct p54_common *priv, int rssi) { int band = priv->hw->conf.channel->band; - if (priv->rxhw != 5) + if (priv->rxhw != 5) { return ((rssi * priv->rssical_db[band].mul) / 64 + priv->rssical_db[band].add) / 4; - else + } else { /* * TODO: find the correct formula */ - return ((rssi * priv->rssical_db[band].mul) / 64 + - priv->rssical_db[band].add) / 4; + return rssi / 2 - 110; + } } /* |