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iwlwifi: support idle for 6000 series hw
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-power.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 *
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33
34 #include <net/mac80211.h>
35
36 #include "iwl-eeprom.h"
37 #include "iwl-dev.h"
38 #include "iwl-core.h"
39 #include "iwl-io.h"
40 #include "iwl-commands.h"
41 #include "iwl-debug.h"
42 #include "iwl-power.h"
43
44 /*
45 * Setting power level allows the card to go to sleep when not busy.
46 *
47 * We calculate a sleep command based on the required latency, which
48 * we get from mac80211. In order to handle thermal throttling, we can
49 * also use pre-defined power levels.
50 */
51
52 /*
53 * For now, keep using power level 1 instead of automatically
54 * adjusting ...
55 */
56 bool no_sleep_autoadjust = true;
57 module_param(no_sleep_autoadjust, bool, S_IRUGO);
58 MODULE_PARM_DESC(no_sleep_autoadjust,
59 "don't automatically adjust sleep level "
60 "according to maximum network latency");
61
62 /*
63 * This defines the old power levels. They are still used by default
64 * (level 1) and for thermal throttle (levels 3 through 5)
65 */
66
67 struct iwl_power_vec_entry {
68 struct iwl_powertable_cmd cmd;
69 u8 no_dtim;
70 };
71
72 #define IWL_DTIM_RANGE_0_MAX 2
73 #define IWL_DTIM_RANGE_1_MAX 10
74
75 #define NOSLP cpu_to_le16(0), 0, 0
76 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
77 #define TU_TO_USEC 1024
78 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
79 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
80 cpu_to_le32(X1), \
81 cpu_to_le32(X2), \
82 cpu_to_le32(X3), \
83 cpu_to_le32(X4)}
84 /* default power management (not Tx power) table values */
85 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
86 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
87 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
88 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
89 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
90 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
91 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
92 };
93
94
95 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
96 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
97 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
98 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
99 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
100 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
101 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
102 };
103
104 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
105 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
106 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
107 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
108 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
109 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
110 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
111 };
112
113 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
114 struct iwl_powertable_cmd *cmd,
115 enum iwl_power_level lvl, int period)
116 {
117 const struct iwl_power_vec_entry *table;
118 int max_sleep, i;
119 bool skip;
120
121 table = range_2;
122 if (period < IWL_DTIM_RANGE_1_MAX)
123 table = range_1;
124 if (period < IWL_DTIM_RANGE_0_MAX)
125 table = range_0;
126
127 BUG_ON(lvl < 0 || lvl >= IWL_POWER_NUM);
128
129 *cmd = table[lvl].cmd;
130
131 if (period == 0) {
132 skip = false;
133 period = 1;
134 } else {
135 skip = !!table[lvl].no_dtim;
136 }
137
138 if (skip) {
139 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
140 max_sleep = le32_to_cpu(slp_itrvl);
141 if (max_sleep == 0xFF)
142 max_sleep = period * (skip + 1);
143 else if (max_sleep > period)
144 max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
145 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
146 } else {
147 max_sleep = period;
148 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
149 }
150
151 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
152 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
153 cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
154
155 if (priv->power_data.pci_pm)
156 cmd->flags |= IWL_POWER_PCI_PM_MSK;
157 else
158 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
159
160 IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
161 }
162
163 /* default Thermal Throttling transaction table
164 * Current state | Throttling Down | Throttling Up
165 *=============================================================================
166 * Condition Nxt State Condition Nxt State Condition Nxt State
167 *-----------------------------------------------------------------------------
168 * IWL_TI_0 T >= 115 CT_KILL 115>T>=105 TI_1 N/A N/A
169 * IWL_TI_1 T >= 115 CT_KILL 115>T>=110 TI_2 T<=95 TI_0
170 * IWL_TI_2 T >= 115 CT_KILL T<=100 TI_1
171 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
172 *=============================================================================
173 */
174 static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
175 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
176 {IWL_TI_1, 105, CT_KILL_THRESHOLD},
177 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
178 };
179 static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
180 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
181 {IWL_TI_2, 110, CT_KILL_THRESHOLD},
182 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
183 };
184 static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
185 {IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
186 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
187 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
188 };
189 static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
190 {IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
191 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
192 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
193 };
194
195 /* Advance Thermal Throttling default restriction table */
196 static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
197 {IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
198 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
199 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
200 {IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
201 };
202
203
204 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
205 struct iwl_powertable_cmd *cmd)
206 {
207 memset(cmd, 0, sizeof(*cmd));
208
209 if (priv->power_data.pci_pm)
210 cmd->flags |= IWL_POWER_PCI_PM_MSK;
211
212 IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
213 }
214
215 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
216 struct iwl_powertable_cmd *cmd,
217 int dynps_ms, int wakeup_period)
218 {
219 /*
220 * These are the original power level 3 sleep successions. The
221 * device may behave better with such succession and was also
222 * only tested with that. Just like the original sleep commands,
223 * also adjust the succession here to the wakeup_period below.
224 * The ranges are the same as for the sleep commands, 0-2, 3-9
225 * and >10, which is selected based on the DTIM interval for
226 * the sleep index but here we use the wakeup period since that
227 * is what we need to do for the latency requirements.
228 */
229 static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
230 static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
231 static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
232 const u8 *slp_succ = slp_succ_r0;
233 int i;
234
235 if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
236 slp_succ = slp_succ_r1;
237 if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
238 slp_succ = slp_succ_r2;
239
240 memset(cmd, 0, sizeof(*cmd));
241
242 cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
243 IWL_POWER_FAST_PD; /* no use seeing frames for others */
244
245 if (priv->power_data.pci_pm)
246 cmd->flags |= IWL_POWER_PCI_PM_MSK;
247
248 cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
249 cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
250
251 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
252 cmd->sleep_interval[i] =
253 cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
254
255 IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
256 }
257
258 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
259 {
260 IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
261 IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
262 IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
263 IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
264 IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
265 le32_to_cpu(cmd->sleep_interval[0]),
266 le32_to_cpu(cmd->sleep_interval[1]),
267 le32_to_cpu(cmd->sleep_interval[2]),
268 le32_to_cpu(cmd->sleep_interval[3]),
269 le32_to_cpu(cmd->sleep_interval[4]));
270
271 return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
272 sizeof(struct iwl_powertable_cmd), cmd);
273 }
274
275
276 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
277 {
278 int ret = 0;
279 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
280 bool enabled = (priv->iw_mode == NL80211_IFTYPE_STATION) &&
281 (priv->hw->conf.flags & IEEE80211_CONF_PS);
282 bool update_chains;
283 struct iwl_powertable_cmd cmd;
284 int dtimper;
285
286 /* Don't update the RX chain when chain noise calibration is running */
287 update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
288 priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
289
290 if (priv->vif)
291 dtimper = priv->vif->bss_conf.dtim_period;
292 else
293 dtimper = 1;
294
295 if (priv->cfg->broken_powersave)
296 iwl_power_sleep_cam_cmd(priv, &cmd);
297 else if (priv->cfg->supports_idle &&
298 priv->hw->conf.flags & IEEE80211_CONF_IDLE)
299 iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_5, 20);
300 else if (tt->state >= IWL_TI_1)
301 iwl_static_sleep_cmd(priv, &cmd, tt->tt_power_mode, dtimper);
302 else if (!enabled)
303 iwl_power_sleep_cam_cmd(priv, &cmd);
304 else if (priv->power_data.debug_sleep_level_override >= 0)
305 iwl_static_sleep_cmd(priv, &cmd,
306 priv->power_data.debug_sleep_level_override,
307 dtimper);
308 else if (no_sleep_autoadjust)
309 iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_1, dtimper);
310 else
311 iwl_power_fill_sleep_cmd(priv, &cmd,
312 priv->hw->conf.dynamic_ps_timeout,
313 priv->hw->conf.max_sleep_period);
314
315 if (iwl_is_ready_rf(priv) &&
316 (memcmp(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd)) || force)) {
317 if (cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
318 set_bit(STATUS_POWER_PMI, &priv->status);
319
320 ret = iwl_set_power(priv, &cmd);
321 if (!ret) {
322 if (!(cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
323 clear_bit(STATUS_POWER_PMI, &priv->status);
324
325 if (priv->cfg->ops->lib->update_chain_flags &&
326 update_chains)
327 priv->cfg->ops->lib->update_chain_flags(priv);
328 else if (priv->cfg->ops->lib->update_chain_flags)
329 IWL_DEBUG_POWER(priv,
330 "Cannot update the power, chain noise "
331 "calibration running: %d\n",
332 priv->chain_noise_data.state);
333 memcpy(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd));
334 } else
335 IWL_ERR(priv, "set power fail, ret = %d", ret);
336 }
337
338 return ret;
339 }
340 EXPORT_SYMBOL(iwl_power_update_mode);
341
342 bool iwl_ht_enabled(struct iwl_priv *priv)
343 {
344 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
345 struct iwl_tt_restriction *restriction;
346
347 if (!priv->thermal_throttle.advanced_tt)
348 return true;
349 restriction = tt->restriction + tt->state;
350 return restriction->is_ht;
351 }
352 EXPORT_SYMBOL(iwl_ht_enabled);
353
354 enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
355 {
356 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
357 struct iwl_tt_restriction *restriction;
358
359 if (!priv->thermal_throttle.advanced_tt)
360 return IWL_ANT_OK_MULTI;
361 restriction = tt->restriction + tt->state;
362 return restriction->tx_stream;
363 }
364 EXPORT_SYMBOL(iwl_tx_ant_restriction);
365
366 enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
367 {
368 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
369 struct iwl_tt_restriction *restriction;
370
371 if (!priv->thermal_throttle.advanced_tt)
372 return IWL_ANT_OK_MULTI;
373 restriction = tt->restriction + tt->state;
374 return restriction->rx_stream;
375 }
376
377 #define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
378
379 /*
380 * toggle the bit to wake up uCode and check the temperature
381 * if the temperature is below CT, uCode will stay awake and send card
382 * state notification with CT_KILL bit clear to inform Thermal Throttling
383 * Management to change state. Otherwise, uCode will go back to sleep
384 * without doing anything, driver should continue the 5 seconds timer
385 * to wake up uCode for temperature check until temperature drop below CT
386 */
387 static void iwl_tt_check_exit_ct_kill(unsigned long data)
388 {
389 struct iwl_priv *priv = (struct iwl_priv *)data;
390 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
391 unsigned long flags;
392
393 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
394 return;
395
396 if (tt->state == IWL_TI_CT_KILL) {
397 if (priv->thermal_throttle.ct_kill_toggle) {
398 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
399 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
400 priv->thermal_throttle.ct_kill_toggle = false;
401 } else {
402 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
403 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
404 priv->thermal_throttle.ct_kill_toggle = true;
405 }
406 iwl_read32(priv, CSR_UCODE_DRV_GP1);
407 spin_lock_irqsave(&priv->reg_lock, flags);
408 if (!iwl_grab_nic_access(priv))
409 iwl_release_nic_access(priv);
410 spin_unlock_irqrestore(&priv->reg_lock, flags);
411
412 /* Reschedule the ct_kill timer to occur in
413 * CT_KILL_EXIT_DURATION seconds to ensure we get a
414 * thermal update */
415 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
416 CT_KILL_EXIT_DURATION * HZ);
417 }
418 }
419
420 static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
421 bool stop)
422 {
423 if (stop) {
424 IWL_DEBUG_POWER(priv, "Stop all queues\n");
425 if (priv->mac80211_registered)
426 ieee80211_stop_queues(priv->hw);
427 IWL_DEBUG_POWER(priv,
428 "Schedule 5 seconds CT_KILL Timer\n");
429 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
430 CT_KILL_EXIT_DURATION * HZ);
431 } else {
432 IWL_DEBUG_POWER(priv, "Wake all queues\n");
433 if (priv->mac80211_registered)
434 ieee80211_wake_queues(priv->hw);
435 }
436 }
437
438 #define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
439 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
440 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
441
442 /*
443 * Legacy thermal throttling
444 * 1) Avoid NIC destruction due to high temperatures
445 * Chip will identify dangerously high temperatures that can
446 * harm the device and will power down
447 * 2) Avoid the NIC power down due to high temperature
448 * Throttle early enough to lower the power consumption before
449 * drastic steps are needed
450 */
451 static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp)
452 {
453 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
454 enum iwl_tt_state old_state;
455
456 #ifdef CONFIG_IWLWIFI_DEBUG
457 if ((tt->tt_previous_temp) &&
458 (temp > tt->tt_previous_temp) &&
459 ((temp - tt->tt_previous_temp) >
460 IWL_TT_INCREASE_MARGIN)) {
461 IWL_DEBUG_POWER(priv,
462 "Temperature increase %d degree Celsius\n",
463 (temp - tt->tt_previous_temp));
464 }
465 #endif
466 old_state = tt->state;
467 /* in Celsius */
468 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
469 tt->state = IWL_TI_CT_KILL;
470 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
471 tt->state = IWL_TI_2;
472 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
473 tt->state = IWL_TI_1;
474 else
475 tt->state = IWL_TI_0;
476
477 #ifdef CONFIG_IWLWIFI_DEBUG
478 tt->tt_previous_temp = temp;
479 #endif
480 if (tt->state != old_state) {
481 switch (tt->state) {
482 case IWL_TI_0:
483 /*
484 * When the system is ready to go back to IWL_TI_0
485 * we only have to call iwl_power_update_mode() to
486 * do so.
487 */
488 break;
489 case IWL_TI_1:
490 tt->tt_power_mode = IWL_POWER_INDEX_3;
491 break;
492 case IWL_TI_2:
493 tt->tt_power_mode = IWL_POWER_INDEX_4;
494 break;
495 default:
496 tt->tt_power_mode = IWL_POWER_INDEX_5;
497 break;
498 }
499 mutex_lock(&priv->mutex);
500 if (iwl_power_update_mode(priv, true)) {
501 /* TT state not updated
502 * try again during next temperature read
503 */
504 tt->state = old_state;
505 IWL_ERR(priv, "Cannot update power mode, "
506 "TT state not updated\n");
507 } else {
508 if (tt->state == IWL_TI_CT_KILL)
509 iwl_perform_ct_kill_task(priv, true);
510 else if (old_state == IWL_TI_CT_KILL &&
511 tt->state != IWL_TI_CT_KILL)
512 iwl_perform_ct_kill_task(priv, false);
513 IWL_DEBUG_POWER(priv, "Temperature state changed %u\n",
514 tt->state);
515 IWL_DEBUG_POWER(priv, "Power Index change to %u\n",
516 tt->tt_power_mode);
517 }
518 mutex_unlock(&priv->mutex);
519 }
520 }
521
522 /*
523 * Advance thermal throttling
524 * 1) Avoid NIC destruction due to high temperatures
525 * Chip will identify dangerously high temperatures that can
526 * harm the device and will power down
527 * 2) Avoid the NIC power down due to high temperature
528 * Throttle early enough to lower the power consumption before
529 * drastic steps are needed
530 * Actions include relaxing the power down sleep thresholds and
531 * decreasing the number of TX streams
532 * 3) Avoid throughput performance impact as much as possible
533 *
534 *=============================================================================
535 * Condition Nxt State Condition Nxt State Condition Nxt State
536 *-----------------------------------------------------------------------------
537 * IWL_TI_0 T >= 115 CT_KILL 115>T>=105 TI_1 N/A N/A
538 * IWL_TI_1 T >= 115 CT_KILL 115>T>=110 TI_2 T<=95 TI_0
539 * IWL_TI_2 T >= 115 CT_KILL T<=100 TI_1
540 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
541 *=============================================================================
542 */
543 static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp)
544 {
545 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
546 int i;
547 bool changed = false;
548 enum iwl_tt_state old_state;
549 struct iwl_tt_trans *transaction;
550
551 old_state = tt->state;
552 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
553 /* based on the current TT state,
554 * find the curresponding transaction table
555 * each table has (IWL_TI_STATE_MAX - 1) entries
556 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
557 * will advance to the correct table.
558 * then based on the current temperature
559 * find the next state need to transaction to
560 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
561 * in the current table to see if transaction is needed
562 */
563 transaction = tt->transaction +
564 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
565 if (temp >= transaction->tt_low &&
566 temp <= transaction->tt_high) {
567 #ifdef CONFIG_IWLWIFI_DEBUG
568 if ((tt->tt_previous_temp) &&
569 (temp > tt->tt_previous_temp) &&
570 ((temp - tt->tt_previous_temp) >
571 IWL_TT_INCREASE_MARGIN)) {
572 IWL_DEBUG_POWER(priv,
573 "Temperature increase %d "
574 "degree Celsius\n",
575 (temp - tt->tt_previous_temp));
576 }
577 tt->tt_previous_temp = temp;
578 #endif
579 if (old_state !=
580 transaction->next_state) {
581 changed = true;
582 tt->state =
583 transaction->next_state;
584 }
585 break;
586 }
587 }
588 if (changed) {
589 struct iwl_rxon_cmd *rxon = &priv->staging_rxon;
590
591 if (tt->state >= IWL_TI_1) {
592 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
593 tt->tt_power_mode = IWL_POWER_INDEX_5;
594 if (!iwl_ht_enabled(priv))
595 /* disable HT */
596 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
597 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
598 RXON_FLG_HT40_PROT_MSK |
599 RXON_FLG_HT_PROT_MSK);
600 else {
601 /* check HT capability and set
602 * according to the system HT capability
603 * in case get disabled before */
604 iwl_set_rxon_ht(priv, &priv->current_ht_config);
605 }
606
607 } else {
608 /*
609 * restore system power setting -- it will be
610 * recalculated automatically.
611 */
612
613 /* check HT capability and set
614 * according to the system HT capability
615 * in case get disabled before */
616 iwl_set_rxon_ht(priv, &priv->current_ht_config);
617 }
618 mutex_lock(&priv->mutex);
619 if (iwl_power_update_mode(priv, true)) {
620 /* TT state not updated
621 * try again during next temperature read
622 */
623 IWL_ERR(priv, "Cannot update power mode, "
624 "TT state not updated\n");
625 tt->state = old_state;
626 } else {
627 IWL_DEBUG_POWER(priv,
628 "Thermal Throttling to new state: %u\n",
629 tt->state);
630 if (old_state != IWL_TI_CT_KILL &&
631 tt->state == IWL_TI_CT_KILL) {
632 IWL_DEBUG_POWER(priv, "Enter IWL_TI_CT_KILL\n");
633 iwl_perform_ct_kill_task(priv, true);
634
635 } else if (old_state == IWL_TI_CT_KILL &&
636 tt->state != IWL_TI_CT_KILL) {
637 IWL_DEBUG_POWER(priv, "Exit IWL_TI_CT_KILL\n");
638 iwl_perform_ct_kill_task(priv, false);
639 }
640 }
641 mutex_unlock(&priv->mutex);
642 }
643 }
644
645 /* Card State Notification indicated reach critical temperature
646 * if PSP not enable, no Thermal Throttling function will be performed
647 * just set the GP1 bit to acknowledge the event
648 * otherwise, go into IWL_TI_CT_KILL state
649 * since Card State Notification will not provide any temperature reading
650 * for Legacy mode
651 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
652 * for advance mode
653 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
654 */
655 static void iwl_bg_ct_enter(struct work_struct *work)
656 {
657 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
658 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
659
660 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
661 return;
662
663 if (!iwl_is_ready(priv))
664 return;
665
666 if (tt->state != IWL_TI_CT_KILL) {
667 IWL_ERR(priv, "Device reached critical temperature "
668 "- ucode going to sleep!\n");
669 if (!priv->thermal_throttle.advanced_tt)
670 iwl_legacy_tt_handler(priv,
671 IWL_MINIMAL_POWER_THRESHOLD);
672 else
673 iwl_advance_tt_handler(priv,
674 CT_KILL_THRESHOLD + 1);
675 }
676 }
677
678 /* Card State Notification indicated out of critical temperature
679 * since Card State Notification will not provide any temperature reading
680 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
681 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
682 */
683 static void iwl_bg_ct_exit(struct work_struct *work)
684 {
685 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
686 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
687
688 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
689 return;
690
691 if (!iwl_is_ready(priv))
692 return;
693
694 /* stop ct_kill_exit_tm timer */
695 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
696
697 if (tt->state == IWL_TI_CT_KILL) {
698 IWL_ERR(priv,
699 "Device temperature below critical"
700 "- ucode awake!\n");
701 if (!priv->thermal_throttle.advanced_tt)
702 iwl_legacy_tt_handler(priv,
703 IWL_REDUCED_PERFORMANCE_THRESHOLD_2);
704 else
705 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD);
706 }
707 }
708
709 void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
710 {
711 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
712 return;
713
714 IWL_DEBUG_POWER(priv, "Queueing critical temperature enter.\n");
715 queue_work(priv->workqueue, &priv->ct_enter);
716 }
717 EXPORT_SYMBOL(iwl_tt_enter_ct_kill);
718
719 void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
720 {
721 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
722 return;
723
724 IWL_DEBUG_POWER(priv, "Queueing critical temperature exit.\n");
725 queue_work(priv->workqueue, &priv->ct_exit);
726 }
727 EXPORT_SYMBOL(iwl_tt_exit_ct_kill);
728
729 static void iwl_bg_tt_work(struct work_struct *work)
730 {
731 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
732 s32 temp = priv->temperature; /* degrees CELSIUS except 4965 */
733
734 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
735 return;
736
737 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
738 temp = KELVIN_TO_CELSIUS(priv->temperature);
739
740 if (!priv->thermal_throttle.advanced_tt)
741 iwl_legacy_tt_handler(priv, temp);
742 else
743 iwl_advance_tt_handler(priv, temp);
744 }
745
746 void iwl_tt_handler(struct iwl_priv *priv)
747 {
748 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
749 return;
750
751 IWL_DEBUG_POWER(priv, "Queueing thermal throttling work.\n");
752 queue_work(priv->workqueue, &priv->tt_work);
753 }
754 EXPORT_SYMBOL(iwl_tt_handler);
755
756 /* Thermal throttling initialization
757 * For advance thermal throttling:
758 * Initialize Thermal Index and temperature threshold table
759 * Initialize thermal throttling restriction table
760 */
761 void iwl_tt_initialize(struct iwl_priv *priv)
762 {
763 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
764 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
765 struct iwl_tt_trans *transaction;
766
767 IWL_DEBUG_POWER(priv, "Initialize Thermal Throttling \n");
768
769 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
770
771 tt->state = IWL_TI_0;
772 init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
773 priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
774 priv->thermal_throttle.ct_kill_exit_tm.function = iwl_tt_check_exit_ct_kill;
775
776 /* setup deferred ct kill work */
777 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
778 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
779 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
780
781 switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
782 case CSR_HW_REV_TYPE_6x00:
783 case CSR_HW_REV_TYPE_6x50:
784 IWL_DEBUG_POWER(priv, "Advanced Thermal Throttling\n");
785 tt->restriction = kzalloc(sizeof(struct iwl_tt_restriction) *
786 IWL_TI_STATE_MAX, GFP_KERNEL);
787 tt->transaction = kzalloc(sizeof(struct iwl_tt_trans) *
788 IWL_TI_STATE_MAX * (IWL_TI_STATE_MAX - 1),
789 GFP_KERNEL);
790 if (!tt->restriction || !tt->transaction) {
791 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
792 priv->thermal_throttle.advanced_tt = false;
793 kfree(tt->restriction);
794 tt->restriction = NULL;
795 kfree(tt->transaction);
796 tt->transaction = NULL;
797 } else {
798 transaction = tt->transaction +
799 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
800 memcpy(transaction, &tt_range_0[0], size);
801 transaction = tt->transaction +
802 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
803 memcpy(transaction, &tt_range_1[0], size);
804 transaction = tt->transaction +
805 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
806 memcpy(transaction, &tt_range_2[0], size);
807 transaction = tt->transaction +
808 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
809 memcpy(transaction, &tt_range_3[0], size);
810 size = sizeof(struct iwl_tt_restriction) *
811 IWL_TI_STATE_MAX;
812 memcpy(tt->restriction,
813 &restriction_range[0], size);
814 priv->thermal_throttle.advanced_tt = true;
815 }
816 break;
817 default:
818 IWL_DEBUG_POWER(priv, "Legacy Thermal Throttling\n");
819 priv->thermal_throttle.advanced_tt = false;
820 break;
821 }
822 }
823 EXPORT_SYMBOL(iwl_tt_initialize);
824
825 /* cleanup thermal throttling management related memory and timer */
826 void iwl_tt_exit(struct iwl_priv *priv)
827 {
828 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
829
830 /* stop ct_kill_exit_tm timer if activated */
831 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
832 cancel_work_sync(&priv->tt_work);
833 cancel_work_sync(&priv->ct_enter);
834 cancel_work_sync(&priv->ct_exit);
835
836 if (priv->thermal_throttle.advanced_tt) {
837 /* free advance thermal throttling memory */
838 kfree(tt->restriction);
839 tt->restriction = NULL;
840 kfree(tt->transaction);
841 tt->transaction = NULL;
842 }
843 }
844 EXPORT_SYMBOL(iwl_tt_exit);
845
846 /* initialize to default */
847 void iwl_power_initialize(struct iwl_priv *priv)
848 {
849 u16 lctl = iwl_pcie_link_ctl(priv);
850
851 priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
852
853 priv->power_data.debug_sleep_level_override = -1;
854
855 memset(&priv->power_data.sleep_cmd, 0,
856 sizeof(priv->power_data.sleep_cmd));
857 }
858 EXPORT_SYMBOL(iwl_power_initialize);
Linux kernel - Deliverables
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