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add a patch for improved transmit signal strength in madwifi

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10264 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd 2008-01-26 03:21:12 +00:00
parent ed9100bcbc
commit 2d4bb468ba
1 changed files with 39 additions and 0 deletions
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package/madwifi/patches/315-power_drop_PR1695.patch Normal file
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@ -0,0 +1,39 @@
The attached patch fixes the problem of very weak packets being send out
after periodic calibration
Signed-off-by: Karol Kowalik <karol.kowalik@cnri.dit.ie>
Index: madwifi-dfs-r3252/ath/if_ath.c
===================================================================
--- madwifi-dfs-r3252.orig/ath/if_ath.c 2008-01-26 03:56:26.461576124 +0100
+++ madwifi-dfs-r3252/ath/if_ath.c 2008-01-26 03:58:50.628969172 +0100
@@ -8875,6 +8875,9 @@
struct ieee80211com *ic = &sc->sc_ic;
/* u_int32_t nchans; */
HAL_BOOL isIQdone = AH_FALSE;
+ u_int8_t papd_probe_power;
+ u_int8_t papd_probe_power_max = 63;
+ u_int16_t crnt_power_hdBm = sc->sc_curtxpow;
sc->sc_stats.ast_per_cal++;
DPRINTF(sc, ATH_DEBUG_CALIBRATE,
@@ -8912,6 +8915,20 @@
sc->sc_stats.ast_per_calfail++;
}
+ /*
+ * After calibration is done we need to update AR5K_PHY_PAPD_PROBE
+ * register with the probe_tx_power equal to current tx_power
+ * otherwise a power drop may be observed
+ */
+ crnt_power_hdBm = crnt_power_hdBm <= ic->ic_txpowlimit ? crnt_power_hdBm : ic->ic_txpowlimit;
+ papd_probe_power = papd_probe_power_max - (ic->ic_txpowlimit - crnt_power_hdBm);
+#define AR5K_PHY_PAPD_PROBE_TX_NEXT 0x00008000
+#define AR5K_PHY_PAPD_PROBE 0x9930
+ OS_REG_WRITE(ah, AR5K_PHY_PAPD_PROBE,
+ AR5K_PHY_PAPD_PROBE_TX_NEXT | (papd_probe_power << 9));
+#undef AR5K_PHY_PAPD_PROBE_TX_NEXT
+#undef AR5K_PHY_PAPD_PROBE
+
ath_hal_process_noisefloor(ah);
if (isIQdone == AH_TRUE) {
/* Unless user has overridden calibration interval,