ath10k: add support to configure BB timing over wmi

Add wmi configuration cmd to configure base band(BB) power amplifier(PA)
off timing values in hardware. The default PA off timings were fine tuned
to make proper DFS radar detection in QCA reference design. If ODM uses
different PA in their design, then the same default PA off timing values
cannot be used, it requires different settling time to detect radar pulses
very sooner and avoid radar detection problems. In that case it provides
provision to select proper PA off timing values based on the PA hardware used.
The PA component is part of FEM hardware and new device tree entry
"ext-fem-name" is used to indentify the FEM hardware. And this wmi configuration
cmd is enabled via wmi service flag "WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT".

Other way is to apply these values through calibration data, but recalibration
of all boards out there might not be feasible.

This change tested on firmware ver 10.2.4-1.0-00042 in QCA988X chipset.

Signed-off-by: Bhagavathi Perumal S <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>

Author: Bhagavathi Perumal S

drivers/net/wireless/ath/ath10k/mac.c

@@ -22,6 +22,7 @@
 #include <net/mac80211.h>
 #include <linux/etherdevice.h>
 #include <linux/acpi.h>
+#include <linux/of.h>
 
 #include "hif.h"
 #include "core.h"
@@ -4637,11 +4638,44 @@ static int ath10k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 	return ret;
 }
 
+static int __ath10k_fetch_bb_timing_dt(struct ath10k *ar,
+				       struct wmi_bb_timing_cfg_arg *bb_timing)
+{
+	struct device_node *node;
+	const char *fem_name;
+	int ret;
+
+	node = ar->dev->of_node;
+	if (!node)
+		return -ENOENT;
+
+	ret = of_property_read_string_index(node, "ext-fem-name", 0, &fem_name);
+	if (ret)
+		return -ENOENT;
+
+	/*
+	 * If external Front End module used in hardware, then default base band timing
+	 * parameter cannot be used since they were fine tuned for reference hardware,
+	 * so choosing different value suitable for that external FEM.
+	 */
+	if (!strcmp("microsemi-lx5586", fem_name)) {
+		bb_timing->bb_tx_timing = 0x00;
+		bb_timing->bb_xpa_timing = 0x0101;
+	} else {
+		return -ENOENT;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot bb_tx_timing 0x%x bb_xpa_timing 0x%x\n",
+		   bb_timing->bb_tx_timing, bb_timing->bb_xpa_timing);
+	return 0;
+}
+
 static int ath10k_start(struct ieee80211_hw *hw)
 {
 	struct ath10k *ar = hw->priv;
 	u32 param;
 	int ret = 0;
+	struct wmi_bb_timing_cfg_arg bb_timing = {0};
 
 	/*
 	 * This makes sense only when restarting hw. It is harmless to call
@@ -4796,6 +4830,19 @@ static int ath10k_start(struct ieee80211_hw *hw)
 		clear_bit(ATH10K_FLAG_BTCOEX, &ar->dev_flags);
 	}
 
+	if (test_bit(WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT, ar->wmi.svc_map)) {
+		ret = __ath10k_fetch_bb_timing_dt(ar, &bb_timing);
+		if (!ret) {
+			ret = ath10k_wmi_pdev_bb_timing(ar, &bb_timing);
+			if (ret) {
+				ath10k_warn(ar,
+					    "failed to set bb timings: %d\n",
+					    ret);
+				goto err_core_stop;
+			}
+		}
+	}
+
 	ar->num_started_vdevs = 0;
 	ath10k_regd_update(ar);
 

drivers/net/wireless/ath/ath10k/wmi-ops.h

@@ -219,6 +219,9 @@ struct wmi_ops {
 	struct sk_buff *(*gen_echo)(struct ath10k *ar, u32 value);
 	struct sk_buff *(*gen_pdev_get_tpc_table_cmdid)(struct ath10k *ar,
 							u32 param);
+	struct sk_buff *(*gen_bb_timing)
+			(struct ath10k *ar,
+			 const struct wmi_bb_timing_cfg_arg *arg);
 
 };
 
@@ -1576,4 +1579,21 @@ ath10k_wmi_report_radar_found(struct ath10k *ar,
 				   ar->wmi.cmd->radar_found_cmdid);
 }
 
+static inline int
+ath10k_wmi_pdev_bb_timing(struct ath10k *ar,
+			  const struct wmi_bb_timing_cfg_arg *arg)
+{
+	struct sk_buff *skb;
+
+	if (!ar->wmi.ops->gen_bb_timing)
+		return -EOPNOTSUPP;
+
+	skb = ar->wmi.ops->gen_bb_timing(ar, arg);
+
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	return ath10k_wmi_cmd_send(ar, skb,
+				   ar->wmi.cmd->set_bb_timing_cmdid);
+}
 #endif

drivers/net/wireless/ath/ath10k/wmi.c

@@ -539,6 +539,7 @@ static struct wmi_cmd_map wmi_10_2_4_cmd_map = {
 		WMI_10_2_PDEV_BSS_CHAN_INFO_REQUEST_CMDID,
 	.pdev_get_tpc_table_cmdid = WMI_CMD_UNSUPPORTED,
 	.radar_found_cmdid = WMI_CMD_UNSUPPORTED,
+	.set_bb_timing_cmdid = WMI_10_2_PDEV_SET_BB_TIMING_CONFIG_CMDID,
 };
 
 /* 10.4 WMI cmd track */
@@ -8843,6 +8844,27 @@ ath10k_wmi_barrier(struct ath10k *ar)
 	return 0;
 }
 
+static struct sk_buff *
+ath10k_wmi_10_2_4_op_gen_bb_timing(struct ath10k *ar,
+				   const struct wmi_bb_timing_cfg_arg *arg)
+{
+	struct wmi_pdev_bb_timing_cfg_cmd *cmd;
+	struct sk_buff *skb;
+
+	skb = ath10k_wmi_alloc_skb(ar, sizeof(*cmd));
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	cmd = (struct wmi_pdev_bb_timing_cfg_cmd *)skb->data;
+	cmd->bb_tx_timing = __cpu_to_le32(arg->bb_tx_timing);
+	cmd->bb_xpa_timing = __cpu_to_le32(arg->bb_xpa_timing);
+
+	ath10k_dbg(ar, ATH10K_DBG_WMI,
+		   "wmi pdev bb_tx_timing 0x%x bb_xpa_timing 0x%x\n",
+		   arg->bb_tx_timing, arg->bb_xpa_timing);
+	return skb;
+}
+
 static const struct wmi_ops wmi_ops = {
 	.rx = ath10k_wmi_op_rx,
 	.map_svc = wmi_main_svc_map,
@@ -9116,6 +9138,7 @@ static const struct wmi_ops wmi_10_2_4_ops = {
 	.gen_pdev_enable_adaptive_cca =
 		ath10k_wmi_op_gen_pdev_enable_adaptive_cca,
 	.get_vdev_subtype = ath10k_wmi_10_2_4_op_get_vdev_subtype,
+	.gen_bb_timing = ath10k_wmi_10_2_4_op_gen_bb_timing,
 	/* .gen_bcn_tmpl not implemented */
 	/* .gen_prb_tmpl not implemented */
 	/* .gen_p2p_go_bcn_ie not implemented */

drivers/net/wireless/ath/ath10k/wmi.h

@@ -206,6 +206,7 @@ enum wmi_service {
 	WMI_SERVICE_TX_DATA_ACK_RSSI,
 	WMI_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT,
 	WMI_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT,
+	WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT,
 
 	/* keep last */
 	WMI_SERVICE_MAX,
@@ -245,6 +246,9 @@ enum wmi_10x_service {
 	WMI_10X_SERVICE_PEER_STATS,
 	WMI_10X_SERVICE_RESET_CHIP,
 	WMI_10X_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS,
+	WMI_10X_SERVICE_VDEV_BCN_RATE_CONTROL,
+	WMI_10X_SERVICE_PER_PACKET_SW_ENCRYPT,
+	WMI_10X_SERVICE_BB_TIMING_CONFIG_SUPPORT,
 };
 
 enum wmi_main_service {
@@ -572,6 +576,8 @@ static inline void wmi_10x_svc_map(const __le32 *in, unsigned long *out,
 	       WMI_SERVICE_RESET_CHIP, len);
 	SVCMAP(WMI_10X_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS,
 	       WMI_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS, len);
+	SVCMAP(WMI_10X_SERVICE_BB_TIMING_CONFIG_SUPPORT,
+	       WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT, len);
 }
 
 static inline void wmi_main_svc_map(const __le32 *in, unsigned long *out,
@@ -992,6 +998,7 @@ struct wmi_cmd_map {
 	u32 pdev_wds_entry_list_cmdid;
 	u32 tdls_set_offchan_mode_cmdid;
 	u32 radar_found_cmdid;
+	u32 set_bb_timing_cmdid;
 };
 
 /*
@@ -1607,6 +1614,8 @@ enum wmi_10_2_cmd_id {
 	WMI_10_2_SET_LTEU_CONFIG_CMDID,
 	WMI_10_2_SET_CCA_PARAMS,
 	WMI_10_2_PDEV_BSS_CHAN_INFO_REQUEST_CMDID,
+	WMI_10_2_FWTEST_CMDID,
+	WMI_10_2_PDEV_SET_BB_TIMING_CONFIG_CMDID,
 	WMI_10_2_PDEV_UTF_CMDID = WMI_10_2_END_CMDID - 1,
 };
 
@@ -7173,6 +7182,23 @@ struct wmi_pdev_chan_info_req_cmd {
 	__le32 reserved;
 } __packed;
 
+/* bb timing register configurations */
+struct wmi_bb_timing_cfg_arg {
+	/* Tx_end to pa off timing */
+	u32 bb_tx_timing;
+
+	/* Tx_end to external pa off timing */
+	u32 bb_xpa_timing;
+};
+
+struct wmi_pdev_bb_timing_cfg_cmd {
+	/* Tx_end to pa off timing */
+	__le32 bb_tx_timing;
+
+	/* Tx_end to external pa off timing */
+	__le32 bb_xpa_timing;
+} __packed;
+
 struct ath10k;
 struct ath10k_vif;
 struct ath10k_fw_stats_pdev;