From: Sven Eckelmann Date: Tue, 11 Jun 2019 13:58:35 +0200 Subject: ath10k: fix max antenna gain unit Most of the txpower for the ath10k firmware is stored as twicepower (0.5 dB steps). This isn't the case for max_antenna_gain - which is still expected by the firmware as dB. The firmware is converting it from dB to the internal (twicepower) representation when it calculates the limits of a channel. This can be seen in tpc_stats when configuring "12" as max_antenna_gain. Instead of the expected 12 (6 dB), the tpc_stats shows 24 (12 dB). Tested on QCA9888 and IPQ4019 with firmware 10.4-3.5.3-00057. Fixes: 02256930d9b8 ("ath10k: use proper tx power unit") Signed-off-by: Sven Eckelmann Forwarded: https://patchwork.kernel.org/patch/10986723/ --- a/ath10k-4.19/mac.c +++ b/ath10k-4.19/mac.c @@ -1185,7 +1185,7 @@ static int ath10k_monitor_vdev_start(str arg.channel.min_power = 0; arg.channel.max_power = channel->max_power * 2; arg.channel.max_reg_power = channel->max_reg_power * 2; - arg.channel.max_antenna_gain = channel->max_antenna_gain * 2; + arg.channel.max_antenna_gain = channel->max_antenna_gain; reinit_completion(&ar->vdev_setup_done); @@ -1627,7 +1627,7 @@ static int ath10k_vdev_start_restart(str arg.channel.min_power = 0; arg.channel.max_power = chandef->chan->max_power * 2; arg.channel.max_reg_power = chandef->chan->max_reg_power * 2; - arg.channel.max_antenna_gain = chandef->chan->max_antenna_gain * 2; + arg.channel.max_antenna_gain = chandef->chan->max_antenna_gain; /* CT Firmware can support 32+ VDEVS, but can only support * beacon-ing devs with dev ids 0 - 31 due to firmware limitations. @@ -3799,7 +3799,7 @@ static int ath10k_update_channel_list(st ch->min_power = 0; ch->max_power = channel->max_power * 2; ch->max_reg_power = channel->max_reg_power * 2; - ch->max_antenna_gain = channel->max_antenna_gain * 2; + ch->max_antenna_gain = channel->max_antenna_gain; ch->reg_class_id = 0; /* FIXME */ /* FIXME: why use only legacy modes, why not any