--- /dev/null
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING.
+ *
+ * Contact Information:
+ * Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#include <linux/slab.h>
+#include <net/mac80211.h>
+
+#include "iwl-trans.h"
+
+#include "dev.h"
+#include "calib.h"
+#include "agn.h"
+
+/*****************************************************************************
+ * INIT calibrations framework
+ *****************************************************************************/
+
+/* Opaque calibration results */
+struct iwl_calib_result {
+ struct list_head list;
+ size_t cmd_len;
+ struct iwl_calib_hdr hdr;
+ /* data follows */
+};
+
+struct statistics_general_data {
+ u32 beacon_silence_rssi_a;
+ u32 beacon_silence_rssi_b;
+ u32 beacon_silence_rssi_c;
+ u32 beacon_energy_a;
+ u32 beacon_energy_b;
+ u32 beacon_energy_c;
+};
+
+int iwl_send_calib_results(struct iwl_priv *priv)
+{
+ struct iwl_host_cmd hcmd = {
+ .id = REPLY_PHY_CALIBRATION_CMD,
+ };
+ struct iwl_calib_result *res;
+
+ list_for_each_entry(res, &priv->calib_results, list) {
+ int ret;
+
+ hcmd.len[0] = res->cmd_len;
+ hcmd.data[0] = &res->hdr;
+ hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
+ ret = iwl_dvm_send_cmd(priv, &hcmd);
+ if (ret) {
+ IWL_ERR(priv, "Error %d on calib cmd %d\n",
+ ret, res->hdr.op_code);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+int iwl_calib_set(struct iwl_priv *priv,
+ const struct iwl_calib_hdr *cmd, int len)
+{
+ struct iwl_calib_result *res, *tmp;
+
+ res = kmalloc(sizeof(*res) + len - sizeof(struct iwl_calib_hdr),
+ GFP_ATOMIC);
+ if (!res)
+ return -ENOMEM;
+ memcpy(&res->hdr, cmd, len);
+ res->cmd_len = len;
+
+ list_for_each_entry(tmp, &priv->calib_results, list) {
+ if (tmp->hdr.op_code == res->hdr.op_code) {
+ list_replace(&tmp->list, &res->list);
+ kfree(tmp);
+ return 0;
+ }
+ }
+
+ /* wasn't in list already */
+ list_add_tail(&res->list, &priv->calib_results);
+
+ return 0;
+}
+
+void iwl_calib_free_results(struct iwl_priv *priv)
+{
+ struct iwl_calib_result *res, *tmp;
+
+ list_for_each_entry_safe(res, tmp, &priv->calib_results, list) {
+ list_del(&res->list);
+ kfree(res);
+ }
+}
+
+/*****************************************************************************
+ * RUNTIME calibrations framework
+ *****************************************************************************/
+
+/* "false alarms" are signals that our DSP tries to lock onto,
+ * but then determines that they are either noise, or transmissions
+ * from a distant wireless network (also "noise", really) that get
+ * "stepped on" by stronger transmissions within our own network.
+ * This algorithm attempts to set a sensitivity level that is high
+ * enough to receive all of our own network traffic, but not so
+ * high that our DSP gets too busy trying to lock onto non-network
+ * activity/noise. */
+static int iwl_sens_energy_cck(struct iwl_priv *priv,
+ u32 norm_fa,
+ u32 rx_enable_time,
+ struct statistics_general_data *rx_info)
+{
+ u32 max_nrg_cck = 0;
+ int i = 0;
+ u8 max_silence_rssi = 0;
+ u32 silence_ref = 0;
+ u8 silence_rssi_a = 0;
+ u8 silence_rssi_b = 0;
+ u8 silence_rssi_c = 0;
+ u32 val;
+
+ /* "false_alarms" values below are cross-multiplications to assess the
+ * numbers of false alarms within the measured period of actual Rx
+ * (Rx is off when we're txing), vs the min/max expected false alarms
+ * (some should be expected if rx is sensitive enough) in a
+ * hypothetical listening period of 200 time units (TU), 204.8 msec:
+ *
+ * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
+ *
+ * */
+ u32 false_alarms = norm_fa * 200 * 1024;
+ u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
+ u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
+ struct iwl_sensitivity_data *data = NULL;
+ const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+ data = &(priv->sensitivity_data);
+
+ data->nrg_auto_corr_silence_diff = 0;
+
+ /* Find max silence rssi among all 3 receivers.
+ * This is background noise, which may include transmissions from other
+ * networks, measured during silence before our network's beacon */
+ silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
+ ALL_BAND_FILTER) >> 8);
+ silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
+ ALL_BAND_FILTER) >> 8);
+ silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
+ ALL_BAND_FILTER) >> 8);
+
+ val = max(silence_rssi_b, silence_rssi_c);
+ max_silence_rssi = max(silence_rssi_a, (u8) val);
+
+ /* Store silence rssi in 20-beacon history table */
+ data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
+ data->nrg_silence_idx++;
+ if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
+ data->nrg_silence_idx = 0;
+
+ /* Find max silence rssi across 20 beacon history */
+ for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
+ val = data->nrg_silence_rssi[i];
+ silence_ref = max(silence_ref, val);
+ }
+ IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
+ silence_rssi_a, silence_rssi_b, silence_rssi_c,
+ silence_ref);
+
+ /* Find max rx energy (min value!) among all 3 receivers,
+ * measured during beacon frame.
+ * Save it in 10-beacon history table. */
+ i = data->nrg_energy_idx;
+ val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
+ data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
+
+ data->nrg_energy_idx++;
+ if (data->nrg_energy_idx >= 10)
+ data->nrg_energy_idx = 0;
+
+ /* Find min rx energy (max value) across 10 beacon history.
+ * This is the minimum signal level that we want to receive well.
+ * Add backoff (margin so we don't miss slightly lower energy frames).
+ * This establishes an upper bound (min value) for energy threshold. */
+ max_nrg_cck = data->nrg_value[0];
+ for (i = 1; i < 10; i++)
+ max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
+ max_nrg_cck += 6;
+
+ IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
+ rx_info->beacon_energy_a, rx_info->beacon_energy_b,
+ rx_info->beacon_energy_c, max_nrg_cck - 6);
+
+ /* Count number of consecutive beacons with fewer-than-desired
+ * false alarms. */
+ if (false_alarms < min_false_alarms)
+ data->num_in_cck_no_fa++;
+ else
+ data->num_in_cck_no_fa = 0;
+ IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
+ data->num_in_cck_no_fa);
+
+ /* If we got too many false alarms this time, reduce sensitivity */
+ if ((false_alarms > max_false_alarms) &&
+ (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
+ IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
+ false_alarms, max_false_alarms);
+ IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
+ data->nrg_curr_state = IWL_FA_TOO_MANY;
+ /* Store for "fewer than desired" on later beacon */
+ data->nrg_silence_ref = silence_ref;
+
+ /* increase energy threshold (reduce nrg value)
+ * to decrease sensitivity */
+ data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
+ /* Else if we got fewer than desired, increase sensitivity */
+ } else if (false_alarms < min_false_alarms) {
+ data->nrg_curr_state = IWL_FA_TOO_FEW;
+
+ /* Compare silence level with silence level for most recent
+ * healthy number or too many false alarms */
+ data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
+ (s32)silence_ref;
+
+ IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
+ false_alarms, min_false_alarms,
+ data->nrg_auto_corr_silence_diff);
+
+ /* Increase value to increase sensitivity, but only if:
+ * 1a) previous beacon did *not* have *too many* false alarms
+ * 1b) AND there's a significant difference in Rx levels
+ * from a previous beacon with too many, or healthy # FAs
+ * OR 2) We've seen a lot of beacons (100) with too few
+ * false alarms */
+ if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
+ ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
+ (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
+
+ IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
+ /* Increase nrg value to increase sensitivity */
+ val = data->nrg_th_cck + NRG_STEP_CCK;
+ data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
+ } else {
+ IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
+ }
+
+ /* Else we got a healthy number of false alarms, keep status quo */
+ } else {
+ IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
+ data->nrg_curr_state = IWL_FA_GOOD_RANGE;
+
+ /* Store for use in "fewer than desired" with later beacon */
+ data->nrg_silence_ref = silence_ref;
+
+ /* If previous beacon had too many false alarms,
+ * give it some extra margin by reducing sensitivity again
+ * (but don't go below measured energy of desired Rx) */
+ if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
+ IWL_DEBUG_CALIB(priv, "... increasing margin\n");
+ if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
+ data->nrg_th_cck -= NRG_MARGIN;
+ else
+ data->nrg_th_cck = max_nrg_cck;
+ }
+ }
+
+ /* Make sure the energy threshold does not go above the measured
+ * energy of the desired Rx signals (reduced by backoff margin),
+ * or else we might start missing Rx frames.
+ * Lower value is higher energy, so we use max()!
+ */
+ data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
+ IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
+
+ data->nrg_prev_state = data->nrg_curr_state;
+
+ /* Auto-correlation CCK algorithm */
+ if (false_alarms > min_false_alarms) {
+
+ /* increase auto_corr values to decrease sensitivity
+ * so the DSP won't be disturbed by the noise
+ */
+ if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
+ data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
+ else {
+ val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
+ data->auto_corr_cck =
+ min((u32)ranges->auto_corr_max_cck, val);
+ }
+ val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
+ data->auto_corr_cck_mrc =
+ min((u32)ranges->auto_corr_max_cck_mrc, val);
+ } else if ((false_alarms < min_false_alarms) &&
+ ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
+ (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
+
+ /* Decrease auto_corr values to increase sensitivity */
+ val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
+ data->auto_corr_cck =
+ max((u32)ranges->auto_corr_min_cck, val);
+ val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
+ data->auto_corr_cck_mrc =
+ max((u32)ranges->auto_corr_min_cck_mrc, val);
+ }
+
+ return 0;
+}
+
+
+static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
+ u32 norm_fa,
+ u32 rx_enable_time)
+{
+ u32 val;
+ u32 false_alarms = norm_fa * 200 * 1024;
+ u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
+ u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
+ struct iwl_sensitivity_data *data = NULL;
+ const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+ data = &(priv->sensitivity_data);
+
+ /* If we got too many false alarms this time, reduce sensitivity */
+ if (false_alarms > max_false_alarms) {
+
+ IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
+ false_alarms, max_false_alarms);
+
+ val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm =
+ min((u32)ranges->auto_corr_max_ofdm, val);
+
+ val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_mrc =
+ min((u32)ranges->auto_corr_max_ofdm_mrc, val);
+
+ val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_x1 =
+ min((u32)ranges->auto_corr_max_ofdm_x1, val);
+
+ val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_mrc_x1 =
+ min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
+ }
+
+ /* Else if we got fewer than desired, increase sensitivity */
+ else if (false_alarms < min_false_alarms) {
+
+ IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
+ false_alarms, min_false_alarms);
+
+ val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm =
+ max((u32)ranges->auto_corr_min_ofdm, val);
+
+ val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_mrc =
+ max((u32)ranges->auto_corr_min_ofdm_mrc, val);
+
+ val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_x1 =
+ max((u32)ranges->auto_corr_min_ofdm_x1, val);
+
+ val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
+ data->auto_corr_ofdm_mrc_x1 =
+ max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
+ } else {
+ IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
+ min_false_alarms, false_alarms, max_false_alarms);
+ }
+ return 0;
+}
+
+static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
+ struct iwl_sensitivity_data *data,
+ __le16 *tbl)
+{
+ tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_ofdm);
+ tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
+ tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_ofdm_x1);
+ tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
+
+ tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_cck);
+ tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
+ cpu_to_le16((u16)data->auto_corr_cck_mrc);
+
+ tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
+ cpu_to_le16((u16)data->nrg_th_cck);
+ tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
+ cpu_to_le16((u16)data->nrg_th_ofdm);
+
+ tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
+ cpu_to_le16(data->barker_corr_th_min);
+ tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
+ cpu_to_le16(data->barker_corr_th_min_mrc);
+ tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
+ cpu_to_le16(data->nrg_th_cca);
+
+ IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
+ data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
+ data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
+ data->nrg_th_ofdm);
+
+ IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
+ data->auto_corr_cck, data->auto_corr_cck_mrc,
+ data->nrg_th_cck);
+}
+
+/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
+static int iwl_sensitivity_write(struct iwl_priv *priv)
+{
+ struct iwl_sensitivity_cmd cmd;
+ struct iwl_sensitivity_data *data = NULL;
+ struct iwl_host_cmd cmd_out = {
+ .id = SENSITIVITY_CMD,
+ .len = { sizeof(struct iwl_sensitivity_cmd), },
+ .flags = CMD_ASYNC,
+ .data = { &cmd, },
+ };
+
+ data = &(priv->sensitivity_data);
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
+
+ /* Update uCode's "work" table, and copy it to DSP */
+ cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
+
+ /* Don't send command to uCode if nothing has changed */
+ if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
+ sizeof(u16)*HD_TABLE_SIZE)) {
+ IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
+ return 0;
+ }
+
+ /* Copy table for comparison next time */
+ memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
+ sizeof(u16)*HD_TABLE_SIZE);
+
+ return iwl_dvm_send_cmd(priv, &cmd_out);
+}
+
+/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
+static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
+{
+ struct iwl_enhance_sensitivity_cmd cmd;
+ struct iwl_sensitivity_data *data = NULL;
+ struct iwl_host_cmd cmd_out = {
+ .id = SENSITIVITY_CMD,
+ .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },
+ .flags = CMD_ASYNC,
+ .data = { &cmd, },
+ };
+
+ data = &(priv->sensitivity_data);
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
+
+ if (priv->lib->hd_v2) {
+ cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
+ HD_INA_NON_SQUARE_DET_OFDM_DATA_V2;
+ cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
+ HD_INA_NON_SQUARE_DET_CCK_DATA_V2;
+ cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
+ HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V2;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V2;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V2;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+ HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+ HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
+ HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V2;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
+ HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V2;
+ } else {
+ cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
+ HD_INA_NON_SQUARE_DET_OFDM_DATA_V1;
+ cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
+ HD_INA_NON_SQUARE_DET_CCK_DATA_V1;
+ cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
+ HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V1;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V1;
+ cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
+ HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V1;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+ HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+ HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
+ HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V1;
+ cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
+ HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V1;
+ }
+
+ /* Update uCode's "work" table, and copy it to DSP */
+ cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
+
+ /* Don't send command to uCode if nothing has changed */
+ if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
+ sizeof(u16)*HD_TABLE_SIZE) &&
+ !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
+ &(priv->enhance_sensitivity_tbl[0]),
+ sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
+ IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
+ return 0;
+ }
+
+ /* Copy table for comparison next time */
+ memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
+ sizeof(u16)*HD_TABLE_SIZE);
+ memcpy(&(priv->enhance_sensitivity_tbl[0]),
+ &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
+ sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
+
+ return iwl_dvm_send_cmd(priv, &cmd_out);
+}
+
+void iwl_init_sensitivity(struct iwl_priv *priv)
+{
+ int ret = 0;
+ int i;
+ struct iwl_sensitivity_data *data = NULL;
+ const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+ if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)
+ return;
+
+ IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
+
+ /* Clear driver's sensitivity algo data */
+ data = &(priv->sensitivity_data);
+
+ if (ranges == NULL)
+ return;
+
+ memset(data, 0, sizeof(struct iwl_sensitivity_data));
+
+ data->num_in_cck_no_fa = 0;
+ data->nrg_curr_state = IWL_FA_TOO_MANY;
+ data->nrg_prev_state = IWL_FA_TOO_MANY;
+ data->nrg_silence_ref = 0;
+ data->nrg_silence_idx = 0;
+ data->nrg_energy_idx = 0;
+
+ for (i = 0; i < 10; i++)
+ data->nrg_value[i] = 0;
+
+ for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
+ data->nrg_silence_rssi[i] = 0;
+
+ data->auto_corr_ofdm = ranges->auto_corr_min_ofdm;
+ data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
+ data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;
+ data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
+ data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
+ data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
+ data->nrg_th_cck = ranges->nrg_th_cck;
+ data->nrg_th_ofdm = ranges->nrg_th_ofdm;
+ data->barker_corr_th_min = ranges->barker_corr_th_min;
+ data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
+ data->nrg_th_cca = ranges->nrg_th_cca;
+
+ data->last_bad_plcp_cnt_ofdm = 0;
+ data->last_fa_cnt_ofdm = 0;
+ data->last_bad_plcp_cnt_cck = 0;
+ data->last_fa_cnt_cck = 0;
+
+ if (priv->fw->enhance_sensitivity_table)
+ ret |= iwl_enhance_sensitivity_write(priv);
+ else
+ ret |= iwl_sensitivity_write(priv);
+ IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
+}
+
+void iwl_sensitivity_calibration(struct iwl_priv *priv)
+{
+ u32 rx_enable_time;
+ u32 fa_cck;
+ u32 fa_ofdm;
+ u32 bad_plcp_cck;
+ u32 bad_plcp_ofdm;
+ u32 norm_fa_ofdm;
+ u32 norm_fa_cck;
+ struct iwl_sensitivity_data *data = NULL;
+ struct statistics_rx_non_phy *rx_info;
+ struct statistics_rx_phy *ofdm, *cck;
+ struct statistics_general_data statis;
+
+ if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)
+ return;
+
+ data = &(priv->sensitivity_data);
+
+ if (!iwl_is_any_associated(priv)) {
+ IWL_DEBUG_CALIB(priv, "<< - not associated\n");
+ return;
+ }
+
+ spin_lock_bh(&priv->statistics.lock);
+ rx_info = &priv->statistics.rx_non_phy;
+ ofdm = &priv->statistics.rx_ofdm;
+ cck = &priv->statistics.rx_cck;
+ if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
+ IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
+ spin_unlock_bh(&priv->statistics.lock);
+ return;
+ }
+
+ /* Extract Statistics: */
+ rx_enable_time = le32_to_cpu(rx_info->channel_load);
+ fa_cck = le32_to_cpu(cck->false_alarm_cnt);
+ fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
+ bad_plcp_cck = le32_to_cpu(cck->plcp_err);
+ bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
+
+ statis.beacon_silence_rssi_a =
+ le32_to_cpu(rx_info->beacon_silence_rssi_a);
+ statis.beacon_silence_rssi_b =
+ le32_to_cpu(rx_info->beacon_silence_rssi_b);
+ statis.beacon_silence_rssi_c =
+ le32_to_cpu(rx_info->beacon_silence_rssi_c);
+ statis.beacon_energy_a =
+ le32_to_cpu(rx_info->beacon_energy_a);
+ statis.beacon_energy_b =
+ le32_to_cpu(rx_info->beacon_energy_b);
+ statis.beacon_energy_c =
+ le32_to_cpu(rx_info->beacon_energy_c);
+
+ spin_unlock_bh(&priv->statistics.lock);
+
+ IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
+
+ if (!rx_enable_time) {
+ IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
+ return;
+ }
+
+ /* These statistics increase monotonically, and do not reset
+ * at each beacon. Calculate difference from last value, or just
+ * use the new statistics value if it has reset or wrapped around. */
+ if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
+ data->last_bad_plcp_cnt_cck = bad_plcp_cck;
+ else {
+ bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
+ data->last_bad_plcp_cnt_cck += bad_plcp_cck;
+ }
+
+ if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
+ data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
+ else {
+ bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
+ data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
+ }
+
+ if (data->last_fa_cnt_ofdm > fa_ofdm)
+ data->last_fa_cnt_ofdm = fa_ofdm;
+ else {
+ fa_ofdm -= data->last_fa_cnt_ofdm;
+ data->last_fa_cnt_ofdm += fa_ofdm;
+ }
+
+ if (data->last_fa_cnt_cck > fa_cck)
+ data->last_fa_cnt_cck = fa_cck;
+ else {
+ fa_cck -= data->last_fa_cnt_cck;
+ data->last_fa_cnt_cck += fa_cck;
+ }
+
+ /* Total aborted signal locks */
+ norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
+ norm_fa_cck = fa_cck + bad_plcp_cck;
+
+ IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
+ bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
+
+ iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
+ iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
+ if (priv->fw->enhance_sensitivity_table)
+ iwl_enhance_sensitivity_write(priv);
+ else
+ iwl_sensitivity_write(priv);
+}
+
+static inline u8 find_first_chain(u8 mask)
+{
+ if (mask & ANT_A)
+ return CHAIN_A;
+ if (mask & ANT_B)
+ return CHAIN_B;
+ return CHAIN_C;
+}
+
+/**
+ * Run disconnected antenna algorithm to find out which antennas are
+ * disconnected.
+ */
+static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
+ struct iwl_chain_noise_data *data)
+{
+ u32 active_chains = 0;
+ u32 max_average_sig;
+ u16 max_average_sig_antenna_i;
+ u8 num_tx_chains;
+ u8 first_chain;
+ u16 i = 0;
+
+ average_sig[0] = data->chain_signal_a / IWL_CAL_NUM_BEACONS;
+ average_sig[1] = data->chain_signal_b / IWL_CAL_NUM_BEACONS;
+ average_sig[2] = data->chain_signal_c / IWL_CAL_NUM_BEACONS;
+
+ if (average_sig[0] >= average_sig[1]) {
+ max_average_sig = average_sig[0];
+ max_average_sig_antenna_i = 0;
+ active_chains = (1 << max_average_sig_antenna_i);
+ } else {
+ max_average_sig = average_sig[1];
+ max_average_sig_antenna_i = 1;
+ active_chains = (1 << max_average_sig_antenna_i);
+ }
+
+ if (average_sig[2] >= max_average_sig) {
+ max_average_sig = average_sig[2];
+ max_average_sig_antenna_i = 2;
+ active_chains = (1 << max_average_sig_antenna_i);
+ }
+
+ IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
+ average_sig[0], average_sig[1], average_sig[2]);
+ IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
+ max_average_sig, max_average_sig_antenna_i);
+
+ /* Compare signal strengths for all 3 receivers. */
+ for (i = 0; i < NUM_RX_CHAINS; i++) {
+ if (i != max_average_sig_antenna_i) {
+ s32 rssi_delta = (max_average_sig - average_sig[i]);
+
+ /* If signal is very weak, compared with
+ * strongest, mark it as disconnected. */
+ if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
+ data->disconn_array[i] = 1;
+ else
+ active_chains |= (1 << i);
+ IWL_DEBUG_CALIB(priv, "i = %d rssiDelta = %d "
+ "disconn_array[i] = %d\n",
+ i, rssi_delta, data->disconn_array[i]);
+ }
+ }
+
+ /*
+ * The above algorithm sometimes fails when the ucode
+ * reports 0 for all chains. It's not clear why that
+ * happens to start with, but it is then causing trouble
+ * because this can make us enable more chains than the
+ * hardware really has.
+ *
+ * To be safe, simply mask out any chains that we know
+ * are not on the device.
+ */
+ active_chains &= priv->nvm_data->valid_rx_ant;
+
+ num_tx_chains = 0;
+ for (i = 0; i < NUM_RX_CHAINS; i++) {
+ /* loops on all the bits of
+ * priv->hw_setting.valid_tx_ant */
+ u8 ant_msk = (1 << i);
+ if (!(priv->nvm_data->valid_tx_ant & ant_msk))
+ continue;
+
+ num_tx_chains++;
+ if (data->disconn_array[i] == 0)
+ /* there is a Tx antenna connected */
+ break;
+ if (num_tx_chains == priv->hw_params.tx_chains_num &&
+ data->disconn_array[i]) {
+ /*
+ * If all chains are disconnected
+ * connect the first valid tx chain
+ */
+ first_chain =
+ find_first_chain(priv->nvm_data->valid_tx_ant);
+ data->disconn_array[first_chain] = 0;
+ active_chains |= BIT(first_chain);
+ IWL_DEBUG_CALIB(priv,
+ "All Tx chains are disconnected W/A - declare %d as connected\n",
+ first_chain);
+ break;
+ }
+ }
+
+ if (active_chains != priv->nvm_data->valid_rx_ant &&
+ active_chains != priv->chain_noise_data.active_chains)
+ IWL_DEBUG_CALIB(priv,
+ "Detected that not all antennas are connected! "
+ "Connected: %#x, valid: %#x.\n",
+ active_chains,
+ priv->nvm_data->valid_rx_ant);
+
+ /* Save for use within RXON, TX, SCAN commands, etc. */
+ data->active_chains = active_chains;
+ IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
+ active_chains);
+}
+
+static void iwlagn_gain_computation(struct iwl_priv *priv,
+ u32 average_noise[NUM_RX_CHAINS],
+ u8 default_chain)
+{
+ int i;
+ s32 delta_g;
+ struct iwl_chain_noise_data *data = &priv->chain_noise_data;
+
+ /*
+ * Find Gain Code for the chains based on "default chain"
+ */
+ for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
+ if ((data->disconn_array[i])) {
+ data->delta_gain_code[i] = 0;
+ continue;
+ }
+
+ delta_g = (priv->lib->chain_noise_scale *
+ ((s32)average_noise[default_chain] -
+ (s32)average_noise[i])) / 1500;
+
+ /* bound gain by 2 bits value max, 3rd bit is sign */
+ data->delta_gain_code[i] =
+ min(abs(delta_g),
+ (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
+
+ if (delta_g < 0)
+ /*
+ * set negative sign ...
+ * note to Intel developers: This is uCode API format,
+ * not the format of any internal device registers.
+ * Do not change this format for e.g. 6050 or similar
+ * devices. Change format only if more resolution
+ * (i.e. more than 2 bits magnitude) is needed.
+ */
+ data->delta_gain_code[i] |= (1 << 2);
+ }
+
+ IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d ANT_C = %d\n",
+ data->delta_gain_code[1], data->delta_gain_code[2]);
+
+ if (!data->radio_write) {
+ struct iwl_calib_chain_noise_gain_cmd cmd;
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ iwl_set_calib_hdr(&cmd.hdr,
+ priv->phy_calib_chain_noise_gain_cmd);
+ cmd.delta_gain_1 = data->delta_gain_code[1];
+ cmd.delta_gain_2 = data->delta_gain_code[2];
+ iwl_dvm_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
+ CMD_ASYNC, sizeof(cmd), &cmd);
+
+ data->radio_write = 1;
+ data->state = IWL_CHAIN_NOISE_CALIBRATED;
+ }
+}
+
+/*
+ * Accumulate 16 beacons of signal and noise statistics for each of
+ * 3 receivers/antennas/rx-chains, then figure out:
+ * 1) Which antennas are connected.
+ * 2) Differential rx gain settings to balance the 3 receivers.
+ */
+void iwl_chain_noise_calibration(struct iwl_priv *priv)
+{
+ struct iwl_chain_noise_data *data = NULL;
+
+ u32 chain_noise_a;
+ u32 chain_noise_b;
+ u32 chain_noise_c;
+ u32 chain_sig_a;
+ u32 chain_sig_b;
+ u32 chain_sig_c;
+ u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
+ u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
+ u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
+ u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
+ u16 i = 0;
+ u16 rxon_chnum = INITIALIZATION_VALUE;
+ u16 stat_chnum = INITIALIZATION_VALUE;
+ u8 rxon_band24;
+ u8 stat_band24;
+ struct statistics_rx_non_phy *rx_info;
+
+ /*
+ * MULTI-FIXME:
+ * When we support multiple interfaces on different channels,
+ * this must be modified/fixed.
+ */
+ struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
+
+ if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
+ return;
+
+ data = &(priv->chain_noise_data);
+
+ /*
+ * Accumulate just the first "chain_noise_num_beacons" after
+ * the first association, then we're done forever.
+ */
+ if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
+ if (data->state == IWL_CHAIN_NOISE_ALIVE)
+ IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
+ return;
+ }
+
+ spin_lock_bh(&priv->statistics.lock);
+
+ rx_info = &priv->statistics.rx_non_phy;
+
+ if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
+ IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
+ spin_unlock_bh(&priv->statistics.lock);
+ return;
+ }
+
+ rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
+ rxon_chnum = le16_to_cpu(ctx->staging.channel);
+ stat_band24 =
+ !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
+ stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
+
+ /* Make sure we accumulate data for just the associated channel
+ * (even if scanning). */
+ if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
+ IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
+ rxon_chnum, rxon_band24);
+ spin_unlock_bh(&priv->statistics.lock);
+ return;
+ }
+
+ /*
+ * Accumulate beacon statistics values across
+ * "chain_noise_num_beacons"
+ */
+ chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
+ IN_BAND_FILTER;
+ chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
+ IN_BAND_FILTER;
+ chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
+ IN_BAND_FILTER;
+
+ chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
+ chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
+ chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
+
+ spin_unlock_bh(&priv->statistics.lock);
+
+ data->beacon_count++;
+
+ data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
+ data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
+ data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
+
+ data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
+ data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
+ data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
+
+ IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
+ rxon_chnum, rxon_band24, data->beacon_count);
+ IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
+ chain_sig_a, chain_sig_b, chain_sig_c);
+ IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
+ chain_noise_a, chain_noise_b, chain_noise_c);
+
+ /* If this is the "chain_noise_num_beacons", determine:
+ * 1) Disconnected antennas (using signal strengths)
+ * 2) Differential gain (using silence noise) to balance receivers */
+ if (data->beacon_count != IWL_CAL_NUM_BEACONS)
+ return;
+
+ /* Analyze signal for disconnected antenna */
+ if (priv->lib->bt_params &&
+ priv->lib->bt_params->advanced_bt_coexist) {
+ /* Disable disconnected antenna algorithm for advanced
+ bt coex, assuming valid antennas are connected */
+ data->active_chains = priv->nvm_data->valid_rx_ant;
+ for (i = 0; i < NUM_RX_CHAINS; i++)
+ if (!(data->active_chains & (1<<i)))
+ data->disconn_array[i] = 1;
+ } else
+ iwl_find_disconn_antenna(priv, average_sig, data);
+
+ /* Analyze noise for rx balance */
+ average_noise[0] = data->chain_noise_a / IWL_CAL_NUM_BEACONS;
+ average_noise[1] = data->chain_noise_b / IWL_CAL_NUM_BEACONS;
+ average_noise[2] = data->chain_noise_c / IWL_CAL_NUM_BEACONS;
+
+ for (i = 0; i < NUM_RX_CHAINS; i++) {
+ if (!(data->disconn_array[i]) &&
+ (average_noise[i] <= min_average_noise)) {
+ /* This means that chain i is active and has
+ * lower noise values so far: */
+ min_average_noise = average_noise[i];
+ min_average_noise_antenna_i = i;
+ }
+ }
+
+ IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
+ average_noise[0], average_noise[1],
+ average_noise[2]);
+
+ IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
+ min_average_noise, min_average_noise_antenna_i);
+
+ iwlagn_gain_computation(
+ priv, average_noise,
+ find_first_chain(priv->nvm_data->valid_rx_ant));
+
+ /* Some power changes may have been made during the calibration.
+ * Update and commit the RXON
+ */
+ iwl_update_chain_flags(priv);
+
+ data->state = IWL_CHAIN_NOISE_DONE;
+ iwl_power_update_mode(priv, false);
+}
+
+void iwl_reset_run_time_calib(struct iwl_priv *priv)
+{
+ int i;
+ memset(&(priv->sensitivity_data), 0,
+ sizeof(struct iwl_sensitivity_data));
+ memset(&(priv->chain_noise_data), 0,
+ sizeof(struct iwl_chain_noise_data));
+ for (i = 0; i < NUM_RX_CHAINS; i++)
+ priv->chain_noise_data.delta_gain_code[i] =
+ CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
+
+ /* Ask for statistics now, the uCode will send notification
+ * periodically after association */
+ iwl_send_statistics_request(priv, CMD_ASYNC, true);
+}
Code Review / kvmfornfv.git / blobdiff