From 45f7e3116fad77e6dd15cb0e2eaccb7de7b806c9 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Tue, 24 Aug 2010 23:29:05 +0200 Subject: [PATCH] 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 Signed-off-by: John W. Linville --- drivers/net/wireless/p54/txrx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c index 34447d1ad80..8f67db487f5 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; + } } /* -- 2.11.4.GIT