ath10k: fill the channel survey results for WCN3990 correctly

The host driver currently expects the channel info event to be
received in pairs for all the channels, i.e. the first
chan_info event for a particular channel will not have the
COMPLETE flag set and the second chan_info event for the
same channel will have the COMPLETE flag set.

The HL2.0 firmware sends only one channel info event per channel
which is scanned without the COMPLETE flag set. After sending the
chan_info_event for all the channels, the HL2.0 firmware sends a
chan_info_event with COMPLETE flag set to indicate the completion
of the channel info event.

The firmware does not indicate this behavior with any service bitmap
and hence a new firmware feature flag is used to handle the modified
parsing of the channel info events, in the host driver, for the
firmware which sends single channel info event per scanned channel.

Tested HW: WCN3990
Tested FW: WLAN.HL.2.0-01188-QCAHLSWMTPLZ-1
Co-developed-by: Surabhi Vishnoi <svishnoi@codeaurora.org>
Signed-off-by: Surabhi Vishnoi <svishnoi@codeaurora.org>
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -594,6 +594,7 @@ static const char *const ath10k_core_fw_feature_str[] = {
 	[ATH10K_FW_FEATURE_NO_PS] = "no-ps",
 	[ATH10K_FW_FEATURE_MGMT_TX_BY_REF] = "mgmt-tx-by-reference",
 	[ATH10K_FW_FEATURE_NON_BMI] = "non-bmi",
+	[ATH10K_FW_FEATURE_SINGLE_CHAN_INFO_PER_CHANNEL] = "single-chan-info-per-channel",
 };
 
 static unsigned int ath10k_core_get_fw_feature_str(char *buf,

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

@@ -761,6 +761,9 @@ enum ath10k_fw_features {
 	/* Firmware load is done externally, not by bmi */
 	ATH10K_FW_FEATURE_NON_BMI = 19,
 
+	/* Firmware sends only one chan_info event per channel */
+	ATH10K_FW_FEATURE_SINGLE_CHAN_INFO_PER_CHANNEL = 20,
+
 	/* keep last */
 	ATH10K_FW_FEATURE_COUNT,
 };

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

@@ -762,6 +762,9 @@ static int ath10k_wmi_tlv_op_pull_ch_info_ev(struct ath10k *ar,
 	arg->noise_floor = ev->noise_floor;
 	arg->rx_clear_count = ev->rx_clear_count;
 	arg->cycle_count = ev->cycle_count;
+	if (test_bit(ATH10K_FW_FEATURE_SINGLE_CHAN_INFO_PER_CHANNEL,
+		     ar->running_fw->fw_file.fw_features))
+		arg->mac_clk_mhz = ev->mac_clk_mhz;
 
 	kfree(tb);
 	return 0;

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

@@ -1579,6 +1579,16 @@ struct ath10k_mgmt_tx_pkt_addr {
 	dma_addr_t paddr;
 };
 
+struct chan_info_params {
+	u32 err_code;
+	u32 freq;
+	u32 cmd_flags;
+	u32 noise_floor;
+	u32 rx_clear_count;
+	u32 cycle_count;
+	u32 mac_clk_mhz;
+};
+
 struct wmi_tlv_mgmt_tx_compl_ev {
 	__le32 desc_id;
 	__le32 status;

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

@@ -2554,60 +2554,69 @@ static int ath10k_wmi_10_4_op_pull_ch_info_ev(struct ath10k *ar,
 	return 0;
 }
 
-void ath10k_wmi_event_chan_info(struct ath10k *ar, struct sk_buff *skb)
+/*
+ * Handle the channel info event for firmware which only sends one
+ * chan_info event per scanned channel.
+ */
+static void ath10k_wmi_event_chan_info_unpaired(struct ath10k *ar,
+						struct chan_info_params *params)
 {
-	struct wmi_ch_info_ev_arg arg = {};
 	struct survey_info *survey;
-	u32 err_code, freq, cmd_flags, noise_floor, rx_clear_count, cycle_count;
-	int idx, ret;
+	int idx;
 
-	ret = ath10k_wmi_pull_ch_info(ar, skb, &arg);
-	if (ret) {
-		ath10k_warn(ar, "failed to parse chan info event: %d\n", ret);
+	if (params->cmd_flags & WMI_CHAN_INFO_FLAG_COMPLETE) {
+		ath10k_dbg(ar, ATH10K_DBG_WMI, "chan info report completed\n");
 		return;
 	}
 
-	err_code = __le32_to_cpu(arg.err_code);
-	freq = __le32_to_cpu(arg.freq);
-	cmd_flags = __le32_to_cpu(arg.cmd_flags);
-	noise_floor = __le32_to_cpu(arg.noise_floor);
-	rx_clear_count = __le32_to_cpu(arg.rx_clear_count);
-	cycle_count = __le32_to_cpu(arg.cycle_count);
+	idx = freq_to_idx(ar, params->freq);
+	if (idx >= ARRAY_SIZE(ar->survey)) {
+		ath10k_warn(ar, "chan info: invalid frequency %d (idx %d out of bounds)\n",
+			    params->freq, idx);
+		return;
+	}
 
-	ath10k_dbg(ar, ATH10K_DBG_WMI,
-		   "chan info err_code %d freq %d cmd_flags %d noise_floor %d rx_clear_count %d cycle_count %d\n",
-		   err_code, freq, cmd_flags, noise_floor, rx_clear_count,
-		   cycle_count);
+	survey = &ar->survey[idx];
 
-	spin_lock_bh(&ar->data_lock);
+	if (!params->mac_clk_mhz || !survey)
+		return;
 
-	switch (ar->scan.state) {
-	case ATH10K_SCAN_IDLE:
-	case ATH10K_SCAN_STARTING:
-		ath10k_warn(ar, "received chan info event without a scan request, ignoring\n");
-		goto exit;
-	case ATH10K_SCAN_RUNNING:
-	case ATH10K_SCAN_ABORTING:
-		break;
-	}
+	memset(survey, 0, sizeof(*survey));
 
-	idx = freq_to_idx(ar, freq);
+	survey->noise = params->noise_floor;
+	survey->time = (params->cycle_count / params->mac_clk_mhz) / 1000;
+	survey->time_busy = (params->rx_clear_count / params->mac_clk_mhz) / 1000;
+	survey->filled |= SURVEY_INFO_NOISE_DBM | SURVEY_INFO_TIME |
+			  SURVEY_INFO_TIME_BUSY;
+}
+
+/*
+ * Handle the channel info event for firmware which sends chan_info
+ * event in pairs(start and stop events) for every scanned channel.
+ */
+static void ath10k_wmi_event_chan_info_paired(struct ath10k *ar,
+					      struct chan_info_params *params)
+{
+	struct survey_info *survey;
+	int idx;
+
+	idx = freq_to_idx(ar, params->freq);
 	if (idx >= ARRAY_SIZE(ar->survey)) {
 		ath10k_warn(ar, "chan info: invalid frequency %d (idx %d out of bounds)\n",
-			    freq, idx);
-		goto exit;
+			    params->freq, idx);
+		return;
 	}
 
-	if (cmd_flags & WMI_CHAN_INFO_FLAG_COMPLETE) {
+	if (params->cmd_flags & WMI_CHAN_INFO_FLAG_COMPLETE) {
 		if (ar->ch_info_can_report_survey) {
 			survey = &ar->survey[idx];
-			survey->noise = noise_floor;
+			survey->noise = params->noise_floor;
 			survey->filled = SURVEY_INFO_NOISE_DBM;
 
 			ath10k_hw_fill_survey_time(ar,
 						   survey,
-						   cycle_count,
-						   rx_clear_count,
+						   params->cycle_count,
+						   params->rx_clear_count,
 						   ar->survey_last_cycle_count,
 						   ar->survey_last_rx_clear_count);
 		}
@@ -2617,11 +2626,56 @@ void ath10k_wmi_event_chan_info(struct ath10k *ar, struct sk_buff *skb)
 		ar->ch_info_can_report_survey = true;
 	}
 
-	if (!(cmd_flags & WMI_CHAN_INFO_FLAG_PRE_COMPLETE)) {
-		ar->survey_last_rx_clear_count = rx_clear_count;
-		ar->survey_last_cycle_count = cycle_count;
+	if (!(params->cmd_flags & WMI_CHAN_INFO_FLAG_PRE_COMPLETE)) {
+		ar->survey_last_rx_clear_count = params->rx_clear_count;
+		ar->survey_last_cycle_count = params->cycle_count;
+	}
+}
+
+void ath10k_wmi_event_chan_info(struct ath10k *ar, struct sk_buff *skb)
+{
+	struct chan_info_params ch_info_param;
+	struct wmi_ch_info_ev_arg arg = {};
+	int ret;
+
+	ret = ath10k_wmi_pull_ch_info(ar, skb, &arg);
+	if (ret) {
+		ath10k_warn(ar, "failed to parse chan info event: %d\n", ret);
+		return;
+	}
+
+	ch_info_param.err_code = __le32_to_cpu(arg.err_code);
+	ch_info_param.freq = __le32_to_cpu(arg.freq);
+	ch_info_param.cmd_flags = __le32_to_cpu(arg.cmd_flags);
+	ch_info_param.noise_floor = __le32_to_cpu(arg.noise_floor);
+	ch_info_param.rx_clear_count = __le32_to_cpu(arg.rx_clear_count);
+	ch_info_param.cycle_count = __le32_to_cpu(arg.cycle_count);
+	ch_info_param.mac_clk_mhz = __le32_to_cpu(arg.mac_clk_mhz);
+
+	ath10k_dbg(ar, ATH10K_DBG_WMI,
+		   "chan info err_code %d freq %d cmd_flags %d noise_floor %d rx_clear_count %d cycle_count %d\n",
+		   ch_info_param.err_code, ch_info_param.freq, ch_info_param.cmd_flags,
+		   ch_info_param.noise_floor, ch_info_param.rx_clear_count,
+		   ch_info_param.cycle_count);
+
+	spin_lock_bh(&ar->data_lock);
+
+	switch (ar->scan.state) {
+	case ATH10K_SCAN_IDLE:
+	case ATH10K_SCAN_STARTING:
+		ath10k_warn(ar, "received chan info event without a scan request, ignoring\n");
+		goto exit;
+	case ATH10K_SCAN_RUNNING:
+	case ATH10K_SCAN_ABORTING:
+		break;
 	}
 
+	if (test_bit(ATH10K_FW_FEATURE_SINGLE_CHAN_INFO_PER_CHANNEL,
+		     ar->running_fw->fw_file.fw_features))
+		ath10k_wmi_event_chan_info_unpaired(ar, &ch_info_param);
+	else
+		ath10k_wmi_event_chan_info_paired(ar, &ch_info_param);
+
 exit:
 	spin_unlock_bh(&ar->data_lock);
 }

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

@@ -6442,6 +6442,14 @@ struct wmi_chan_info_event {
 	__le32 noise_floor;
 	__le32 rx_clear_count;
 	__le32 cycle_count;
+	__le32 chan_tx_pwr_range;
+	__le32 chan_tx_pwr_tp;
+	__le32 rx_frame_count;
+	__le32 my_bss_rx_cycle_count;
+	__le32 rx_11b_mode_data_duration;
+	__le32 tx_frame_cnt;
+	__le32 mac_clk_mhz;
+
 } __packed;
 
 struct wmi_10_4_chan_info_event {
@@ -6670,6 +6678,10 @@ struct wmi_ch_info_ev_arg {
 	__le32 chan_tx_pwr_range;
 	__le32 chan_tx_pwr_tp;
 	__le32 rx_frame_count;
+	__le32 my_bss_rx_cycle_count;
+	__le32 rx_11b_mode_data_duration;
+	__le32 tx_frame_cnt;
+	__le32 mac_clk_mhz;
 };
 
 /* From 10.4 firmware, not sure all have the same values. */