ath10k: support get/set antenna configurations.

Verified that target's tx/rx chain register is set appropriately,
and that the tx rate goes down as number of chains
decrease, but I did not actually try to verify antenna
ceased to transmit when disabled.

kvalo: move ar->supp_*_chainmask initialisation to ath10k_mac_register()

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Avery Pennarun <apenwarr@gmail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

2 files changed, 86 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 2c1dfd719146..679b2a32331b 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -440,6 +440,12 @@ struct ath10k {
         bool radar_enabled;
         int num_started_vdevs;
 
+        /* Protected by conf-mutex */
+        u8 supp_tx_chainmask;
+        u8 supp_rx_chainmask;
+        u8 cfg_tx_chainmask;
+        u8 cfg_rx_chainmask;
+
         struct wmi_pdev_set_wmm_params_arg wmm_params;
         struct completion install_key_done;
 
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 12518047bd31..8c997626f45f 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2332,6 +2332,68 @@ void ath10k_halt(struct ath10k *ar)
         spin_unlock_bh(&ar->data_lock);
 }
 
+static int ath10k_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
+{
+        struct ath10k *ar = hw->priv;
+
+        mutex_lock(&ar->conf_mutex);
+
+        if (ar->cfg_tx_chainmask) {
+                *tx_ant = ar->cfg_tx_chainmask;
+                *rx_ant = ar->cfg_rx_chainmask;
+        } else {
+                *tx_ant = ar->supp_tx_chainmask;
+                *rx_ant = ar->supp_rx_chainmask;
+        }
+
+        mutex_unlock(&ar->conf_mutex);
+
+        return 0;
+}
+
+static int __ath10k_set_antenna(struct ath10k *ar, u32 tx_ant, u32 rx_ant)
+{
+        int ret;
+
+        lockdep_assert_held(&ar->conf_mutex);
+
+        ar->cfg_tx_chainmask = tx_ant;
+        ar->cfg_rx_chainmask = rx_ant;
+
+        if ((ar->state != ATH10K_STATE_ON) &&
+            (ar->state != ATH10K_STATE_RESTARTED))
+                return 0;
+
+        ret = ath10k_wmi_pdev_set_param(ar, ar->wmi.pdev_param->tx_chain_mask,
+                                        tx_ant);
+        if (ret) {
+                ath10k_warn("failed to set tx-chainmask: %d, req 0x%x\n",
+                            ret, tx_ant);
+                return ret;
+        }
+
+        ret = ath10k_wmi_pdev_set_param(ar, ar->wmi.pdev_param->rx_chain_mask,
+                                        rx_ant);
+        if (ret) {
+                ath10k_warn("failed to set rx-chainmask: %d, req 0x%x\n",
+                            ret, rx_ant);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int ath10k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
+{
+        struct ath10k *ar = hw->priv;
+        int ret;
+
+        mutex_lock(&ar->conf_mutex);
+        ret = __ath10k_set_antenna(ar, tx_ant, rx_ant);
+        mutex_unlock(&ar->conf_mutex);
+        return ret;
+}
+
 static int ath10k_start(struct ieee80211_hw *hw)
 {
         struct ath10k *ar = hw->priv;
@@ -2373,6 +2435,10 @@ static int ath10k_start(struct ieee80211_hw *hw)
         if (ret)
                 ath10k_warn("failed to enable dynamic BW: %d\n", ret);
 
+        if (ar->cfg_tx_chainmask)
+                __ath10k_set_antenna(ar, ar->cfg_tx_chainmask,
+                                     ar->cfg_rx_chainmask);
+
         /*
          * By default FW set ARP frames ac to voice (6). In that case ARP
          * exchange is not working properly for UAPSD enabled AP. ARP requests
@@ -4256,6 +4322,8 @@ static const struct ieee80211_ops ath10k_ops = {
         .set_frag_threshold             = ath10k_set_frag_threshold,
         .flush                          = ath10k_flush,
         .tx_last_beacon                 = ath10k_tx_last_beacon,
+        .set_antenna                    = ath10k_set_antenna,
+        .get_antenna                    = ath10k_get_antenna,
         .restart_complete               = ath10k_restart_complete,
         .get_survey                     = ath10k_get_survey,
         .set_bitrate_mask               = ath10k_set_bitrate_mask,
@@ -4605,6 +4673,18 @@ int ath10k_mac_register(struct ath10k *ar)
                 BIT(NL80211_IFTYPE_ADHOC) |
                 BIT(NL80211_IFTYPE_AP);
 
+        if (test_bit(ATH10K_FW_FEATURE_WMI_10X, ar->fw_features)) {
+                /* TODO:  Have to deal with 2x2 chips if/when the come out. */
+                ar->supp_tx_chainmask = TARGET_10X_TX_CHAIN_MASK;
+                ar->supp_rx_chainmask = TARGET_10X_RX_CHAIN_MASK;
+        } else {
+                ar->supp_tx_chainmask = TARGET_TX_CHAIN_MASK;
+                ar->supp_rx_chainmask = TARGET_RX_CHAIN_MASK;
+        }
+
+        ar->hw->wiphy->available_antennas_rx = ar->supp_rx_chainmask;
+        ar->hw->wiphy->available_antennas_tx = ar->supp_tx_chainmask;
+
         if (!test_bit(ATH10K_FW_FEATURE_NO_P2P, ar->fw_features))
                 ar->hw->wiphy->interface_modes |=
                         BIT(NL80211_IFTYPE_P2P_CLIENT) |