Author: bschmidt
Date: Thu Jul 15 09:34:00 2010
New Revision: 210110
URL: http://svn.freebsd.org/changeset/base/210110
Log:
Detect active chains differently to work around a firmware bug which
would mark non-existing chains as active.
Obtained from: OpenBSD
MFC after: 1 week
Modified:
head/sys/dev/iwn/if_iwn.c
Modified: head/sys/dev/iwn/if_iwn.c
==============================================================================
--- head/sys/dev/iwn/if_iwn.c Thu Jul 15 09:30:54 2010 (r210109)
+++ head/sys/dev/iwn/if_iwn.c Thu Jul 15 09:34:00 2010 (r210110)
@@ -4134,10 +4134,14 @@ iwn_collect_noise(struct iwn_softc *sc,
val = MAX(calib->rssi[2], val);
/* Determine which antennas are connected. */
- sc->chainmask = 0;
+ sc->chainmask = sc->rxchainmask;
for (i = 0; i < 3; i++)
- if (val - calib->rssi[i] <= 15 * 20)
- sc->chainmask |= 1 << i;
+ if (val - calib->rssi[i] > 15 * 20)
+ sc->chainmask &= ~(1 << i);
+ DPRINTF(sc, IWN_DEBUG_CALIBRATE,
+ "%s: RX chains mask: theoretical=0x%x, actual=0x%x\n",
+ __func__, sc->rxchainmask, sc->chainmask);
+
/* If none of the TX antennas are connected, keep at least one. */
if ((sc->chainmask & sc->txchainmask) == 0)
sc->chainmask |= IWN_LSB(sc->txchainmask);
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