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-rw-r--r--package/madwifi/patches/315-power_drop_PR1695.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/package/madwifi/patches/315-power_drop_PR1695.patch b/package/madwifi/patches/315-power_drop_PR1695.patch
new file mode 100644
index 000000000..6b512b564
--- /dev/null
+++ b/package/madwifi/patches/315-power_drop_PR1695.patch
@@ -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,