package/kernel/mac80211/patches/ath/980-ath10k-fix-max-antenna-gain-unit.patch

   1 From: Sven Eckelmann <seckelmann@datto.com>
   2 Date: Tue, 11 Jun 2019 13:58:35 +0200
   3 Subject: ath10k: fix max antenna gain unit
   4
   5 Most of the txpower for the ath10k firmware is stored as twicepower (0.5 dB
   6 steps). This isn't the case for max_antenna_gain - which is still expected
   7 by the firmware as dB.
   8
   9 The firmware is converting it from dB to the internal (twicepower)
  10 representation when it calculates the limits of a channel. This can be seen
  11 in tpc_stats when configuring "12" as max_antenna_gain. Instead of the
  12 expected 12 (6 dB), the tpc_stats shows 24 (12 dB).
  13
  14 Tested on QCA9888 and IPQ4019 with firmware 10.4-3.5.3-00057.
  15
  16 Fixes: 02256930d9b8 ("ath10k: use proper tx power unit")
  17 Signed-off-by: Sven Eckelmann <seckelmann@datto.com>
  18
  19 Forwarded: https://patchwork.kernel.org/patch/10986723/
  20
  21 --- a/drivers/net/wireless/ath/ath10k/mac.c
  22 +++ b/drivers/net/wireless/ath/ath10k/mac.c
  23 @@ -1042,7 +1042,7 @@ static int ath10k_monitor_vdev_start(str
  24         arg.channel.min_power = 0;
  25         arg.channel.max_power = channel->max_power * 2;
  26         arg.channel.max_reg_power = channel->max_reg_power * 2;
  27 -       arg.channel.max_antenna_gain = channel->max_antenna_gain * 2;
  28 +       arg.channel.max_antenna_gain = channel->max_antenna_gain;
  29
  30         reinit_completion(&ar->vdev_setup_done);
  31         reinit_completion(&ar->vdev_delete_done);
  32 @@ -1488,7 +1488,7 @@ static int ath10k_vdev_start_restart(str
  33         arg.channel.min_power = 0;
  34         arg.channel.max_power = chandef->chan->max_power * 2;
  35         arg.channel.max_reg_power = chandef->chan->max_reg_power * 2;
  36 -       arg.channel.max_antenna_gain = chandef->chan->max_antenna_gain * 2;
  37 +       arg.channel.max_antenna_gain = chandef->chan->max_antenna_gain;
  38
  39         if (arvif->vdev_type == WMI_VDEV_TYPE_AP) {
  40                 arg.ssid = arvif->u.ap.ssid;
  41 @@ -3169,7 +3169,7 @@ static int ath10k_update_channel_list(st
  42                         ch->min_power = 0;
  43                         ch->max_power = channel->max_power * 2;
  44                         ch->max_reg_power = channel->max_reg_power * 2;
  45 -                       ch->max_antenna_gain = channel->max_antenna_gain * 2;
  46 +                       ch->max_antenna_gain = channel->max_antenna_gain;
  47                         ch->reg_class_id = 0; /* FIXME */
  48
  49                         /* FIXME: why use only legacy modes, why not any