Commit-ID: 45f7e3116fad77e6dd15cb0e2eaccb7de7b806c9
Gitweb: http://git.kernel.org/tip/45f7e3116fad77e6dd15cb0e2eaccb7de7b806c9
Author: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>
AuthorDate: Tue, 24 Aug 2010 23:29:05 +0200
Committer: John W. Linville <linville@xxxxxxxxxxxxx>
CommitDate: Wed, 25 Aug 2010 14:34:56 -0400
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@xxxxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
---
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 34447d1..8f67db4 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;
+ }
}
/*
--
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