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>
diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c
index 34447d1..8f67db4 100644
--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@@ -275,15 +275,15 @@
{
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;
+ }
}
/*