package/madwifi/patches/315-power_drop_PR1695.patch

   1 The attached patch fixes the problem of very weak packets being send out
   2 after periodic calibration
   3
   4 Signed-off-by: Karol Kowalik <karol.kowalik@cnri.dit.ie>
   5 Index: madwifi-dfs-r3252/ath/if_ath.c
   6 ===================================================================
   7 --- madwifi-dfs-r3252.orig/ath/if_ath.c 2008-01-26 03:56:26.461576124 +0100
   8 +++ madwifi-dfs-r3252/ath/if_ath.c      2008-01-26 03:58:50.628969172 +0100
   9 @@ -8875,6 +8875,9 @@
  10         struct ieee80211com *ic = &sc->sc_ic;
  11         /* u_int32_t nchans; */
  12         HAL_BOOL isIQdone = AH_FALSE;
  13 +       u_int8_t papd_probe_power;
  14 +       u_int8_t papd_probe_power_max = 63;
  15 +       u_int16_t crnt_power_hdBm = sc->sc_curtxpow;
  16
  17         sc->sc_stats.ast_per_cal++;
  18         DPRINTF(sc, ATH_DEBUG_CALIBRATE,
  19 @@ -8912,6 +8915,20 @@
  20                 sc->sc_stats.ast_per_calfail++;
  21         }
  22
  23 +       /*
  24 +       * After calibration is done we need to update AR5K_PHY_PAPD_PROBE
  25 +       * register with the probe_tx_power equal to current tx_power
  26 +       * otherwise a power drop may be observed
  27 +       */
  28 +       crnt_power_hdBm = crnt_power_hdBm <= ic->ic_txpowlimit ? crnt_power_hdBm : ic->ic_txpowlimit;
  29 +       papd_probe_power = papd_probe_power_max - (ic->ic_txpowlimit - crnt_power_hdBm);
  30 +#define AR5K_PHY_PAPD_PROBE_TX_NEXT 0x00008000
  31 +#define AR5K_PHY_PAPD_PROBE 0x9930
  32 +       OS_REG_WRITE(ah, AR5K_PHY_PAPD_PROBE,
  33 +       AR5K_PHY_PAPD_PROBE_TX_NEXT | (papd_probe_power << 9));
  34 +#undef AR5K_PHY_PAPD_PROBE_TX_NEXT
  35 +#undef AR5K_PHY_PAPD_PROBE
  36 +
  37         ath_hal_process_noisefloor(ah);
  38         if (isIQdone == AH_TRUE) {
  39                 /* Unless user has overridden calibration interval,