Commit 45f7e311 authored Aug 24, 2010 by Christian Lamparter Committed by John W. Linville Aug 25, 2010

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>

parent 2c15a0cf

drivers/net/wireless/p54/txrx.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}

		/*