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linux/drivers/net/wireless/iwlwifi/iwl-agn-calib.c
Johannes Berg 0da0e5bf15 iwlagn: clean up & autodetect statistics 
There's no need to keep both normal and BT statistics
versions around all the time in memory when we only
use a subset of both. So keep only the subsets that
we need in memory, depending on the debug config).

Also, in doing so, we can remove all the calls to
iwl_bt_statistics() in the driver as we'll just
access the copied statistics now.

Finally, also remove this call from the one place
where it might still be needed and automatically
detect what kind of statistics the device is sending
based on their size. This way, we don't need to keep
track of which devices do what any more, which is
good since this is subject to change based on the
ucode version (as some ucode even for non-BT devices
will in fact use BT statistics).

Warn upon encountering a statistics command from the
ucode that isn't known, so we will find such issues
earlier in the future.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Tested-by: Don Fry <donald.h.fry@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
2011-04-08 08:19:00 -07:00

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/******************************************************************************
*
* 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 - 2011 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 LICENSE.GPL.
*
* 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 - 2011 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-dev.h"
#include "iwl-core.h"
#include "iwl-agn-calib.h"
/*****************************************************************************
* INIT calibrations framework
*****************************************************************************/
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)
{
int ret = 0;
int i = 0;
struct iwl_host_cmd hcmd = {
.id = REPLY_PHY_CALIBRATION_CMD,
.flags = CMD_SIZE_HUGE,
};
for (i = 0; i < IWL_CALIB_MAX; i++) {
if ((BIT(i) & priv->hw_params.calib_init_cfg) &&
priv->calib_results[i].buf) {
hcmd.len = priv->calib_results[i].buf_len;
hcmd.data = priv->calib_results[i].buf;
ret = iwl_send_cmd_sync(priv, &hcmd);
if (ret) {
IWL_ERR(priv, "Error %d iteration %d\n",
ret, i);
break;
}
}
}
return ret;
}
int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
{
if (res->buf_len != len) {
kfree(res->buf);
res->buf = kzalloc(len, GFP_ATOMIC);
}
if (unlikely(res->buf == NULL))
return -ENOMEM;
res->buf_len = len;
memcpy(res->buf, buf, len);
return 0;
}
void iwl_calib_free_results(struct iwl_priv *priv)
{
int i;
for (i = 0; i < IWL_CALIB_MAX; i++) {
kfree(priv->calib_results[i].buf);
priv->calib_results[i].buf = NULL;
priv->calib_results[i].buf_len = 0;
}
}
/*****************************************************************************
* 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_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]);
cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
HD_INA_NON_SQUARE_DET_OFDM_DATA;
cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
HD_INA_NON_SQUARE_DET_CCK_DATA;
cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA;
cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA;
cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
HD_OFDM_NON_SQUARE_DET_SLOPE_DATA;
cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA;
cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA;
cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
HD_CCK_NON_SQUARE_DET_SLOPE_DATA;
cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA;
/* 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_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->disable_sens_cal)
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->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;
unsigned long flags;
struct statistics_general_data statis;
if (priv->disable_sens_cal)
return;
data = &(priv->sensitivity_data);
if (!iwl_is_any_associated(priv)) {
IWL_DEBUG_CALIB(priv, "<< - not associated\n");
return;
}
spin_lock_irqsave(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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->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 /
priv->cfg->base_params->chain_noise_num_beacons;
average_sig[1] = data->chain_signal_b /
priv->cfg->base_params->chain_noise_num_beacons;
average_sig[2] = data->chain_signal_c /
priv->cfg->base_params->chain_noise_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->hw_params.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->hw_params.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->cfg->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->hw_params.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->hw_params.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);
}
/*
* 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;
unsigned long flags;
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->disable_chain_noise_cal)
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_irqsave(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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 !=
priv->cfg->base_params->chain_noise_num_beacons)
return;
/* Analyze signal for disconnected antenna */
if (priv->cfg->bt_params &&
priv->cfg->bt_params->advanced_bt_coexist) {
/* Disable disconnected antenna algorithm for advanced
bt coex, assuming valid antennas are connected */
data->active_chains = priv->hw_params.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 /
priv->cfg->base_params->chain_noise_num_beacons;
average_noise[1] = data->chain_noise_b /
priv->cfg->base_params->chain_noise_num_beacons;
average_noise[2] = data->chain_noise_c /
priv->cfg->base_params->chain_noise_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);
if (priv->cfg->ops->utils->gain_computation)
priv->cfg->ops->utils->gain_computation(priv, average_noise,
min_average_noise_antenna_i, min_average_noise,
find_first_chain(priv->cfg->valid_rx_ant));
/* Some power changes may have been made during the calibration.
* Update and commit the RXON
*/
if (priv->cfg->ops->lib->update_chain_flags)
priv->cfg->ops->lib->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);
}
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