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mac80211: ath10k: adjust tx power reduction for US regulatory domain
FCC allows maximum antenna gain of 6 dBi. 15.247(b)(4): > (4) The conducted output power limit > specified in paragraph (b) of this section > is based on the use of antennas > with directional gains that do not exceed > 6 dBi. Except as shown in paragraph > (c) of this section, if transmitting > antennas of directional gain greater > than 6 dBi are used, the conducted > output power from the intentional radiator > shall be reduced below the stated > values in paragraphs (b)(1), (b)(2), > and (b)(3) of this section, as appropriate, > by the amount in dB that the > directional gain of the antenna exceeds > 6 dBi. https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol1/pdf/CFR-2013-title47-vol1-sec15-247.pdf Signed-off-by: Sven Eckelmann <sven@narfation.org>master
Sven Eckelmann
Christian Lamparter
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From: Sven Eckelmann <seckelmann@datto.com>
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Date: Wed, 28 Nov 2018 16:16:27 +0100
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Subject: ath10k: adjust tx power reduction for US regulatory domain
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FCC allows maximum antenna gain of 6 dBi. 15.247(b)(4):
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> (4) The conducted output power limit
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> specified in paragraph (b) of this section
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> is based on the use of antennas
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> with directional gains that do not exceed
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> 6 dBi. Except as shown in paragraph
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> (c) of this section, if transmitting
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> antennas of directional gain greater
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> than 6 dBi are used, the conducted
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> output power from the intentional radiator
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> shall be reduced below the stated
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> values in paragraphs (b)(1), (b)(2),
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> and (b)(3) of this section, as appropriate,
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> by the amount in dB that the
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> directional gain of the antenna exceeds
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> 6 dBi.
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https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol1/pdf/CFR-2013-title47-vol1-sec15-247.pdf
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Signed-off-by: Sven Eckelmann <seckelmann@datto.com>
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Forwarded: no
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--- a/drivers/net/wireless/ath/ath10k/mac.c
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+++ b/drivers/net/wireless/ath/ath10k/mac.c
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@@ -988,6 +988,40 @@ static inline int ath10k_vdev_setup_sync
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return 0;
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}
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+static u32 ath10k_get_max_antenna_gain(struct ath10k *ar,
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+ u32 ch_max_antenna_gain)
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+{
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+ u32 max_antenna_gain;
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+
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+ if (ar->dfs_detector && ar->dfs_detector->region == NL80211_DFS_FCC) {
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+ /* FCC allows maximum antenna gain of 6 dBi. 15.247(b)(4):
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+ *
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+ * > (4) The conducted output power limit
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+ * > specified in paragraph (b) of this section
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+ * > is based on the use of antennas
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+ * > with directional gains that do not exceed
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+ * > 6 dBi. Except as shown in paragraph
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+ * > (c) of this section, if transmitting
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+ * > antennas of directional gain greater
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+ * > than 6 dBi are used, the conducted
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+ * > output power from the intentional radiator
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+ * > shall be reduced below the stated
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+ * > values in paragraphs (b)(1), (b)(2),
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+ * > and (b)(3) of this section, as appropriate,
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+ * > by the amount in dB that the
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+ * > directional gain of the antenna exceeds
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+ * > 6 dBi.
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+ *
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+ * https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol1/pdf/CFR-2013-title47-vol1-sec15-247.pdf
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+ */
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+ max_antenna_gain = 6;
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+ } else {
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+ max_antenna_gain = 0;
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+ }
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+
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+ return max(ch_max_antenna_gain, max_antenna_gain);
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+}
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+
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static int ath10k_monitor_vdev_start(struct ath10k *ar, int vdev_id)
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{
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struct cfg80211_chan_def *chandef = NULL;
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@@ -1020,7 +1054,8 @@ static int ath10k_monitor_vdev_start(str
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arg.channel.min_power = 0;
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arg.channel.max_power = channel->max_power * 2;
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arg.channel.max_reg_power = channel->max_reg_power * 2;
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- arg.channel.max_antenna_gain = channel->max_antenna_gain;
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+ arg.channel.max_antenna_gain = ath10k_get_max_antenna_gain(ar,
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+ channel->max_antenna_gain);
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reinit_completion(&ar->vdev_setup_done);
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@@ -1462,7 +1497,8 @@ static int ath10k_vdev_start_restart(str
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arg.channel.min_power = 0;
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arg.channel.max_power = chandef->chan->max_power * 2;
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arg.channel.max_reg_power = chandef->chan->max_reg_power * 2;
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- arg.channel.max_antenna_gain = chandef->chan->max_antenna_gain;
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+ arg.channel.max_antenna_gain = ath10k_get_max_antenna_gain(ar,
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+ chandef->chan->max_antenna_gain);
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if (arvif->vdev_type == WMI_VDEV_TYPE_AP) {
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arg.ssid = arvif->u.ap.ssid;
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@@ -3139,7 +3175,8 @@ static int ath10k_update_channel_list(st
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ch->min_power = 0;
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ch->max_power = channel->max_power * 2;
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ch->max_reg_power = channel->max_reg_power * 2;
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- ch->max_antenna_gain = channel->max_antenna_gain;
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+ ch->max_antenna_gain = ath10k_get_max_antenna_gain(ar,
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+ channel->max_antenna_gain);
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ch->reg_class_id = 0; /* FIXME */
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/* FIXME: why use only legacy modes, why not any
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