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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[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 (tt->state >= IWL_TI_1)
298 iwl_static_sleep_cmd(priv, &cmd, tt->tt_power_mode, dtimper);
299 else if (!enabled)
300 iwl_power_sleep_cam_cmd(priv, &cmd);
301 else if (priv->power_data.debug_sleep_level_override >= 0)
302 iwl_static_sleep_cmd(priv, &cmd,
303 priv->power_data.debug_sleep_level_override,
304 dtimper);
305 else if (no_sleep_autoadjust)
306 iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_1, dtimper);
307 else
308 iwl_power_fill_sleep_cmd(priv, &cmd,
309 priv->hw->conf.dynamic_ps_timeout,
310 priv->hw->conf.max_sleep_period);
311
312 if (iwl_is_ready_rf(priv) &&
313 (memcmp(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd)) || force)) {
314 if (cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
315 set_bit(STATUS_POWER_PMI, &priv->status);
316
317 ret = iwl_set_power(priv, &cmd);
318 if (!ret) {
319 if (!(cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
320 clear_bit(STATUS_POWER_PMI, &priv->status);
321
322 if (priv->cfg->ops->lib->update_chain_flags &&
323 update_chains)
324 priv->cfg->ops->lib->update_chain_flags(priv);
325 else if (priv->cfg->ops->lib->update_chain_flags)
326 IWL_DEBUG_POWER(priv,
327 "Cannot update the power, chain noise "
328 "calibration running: %d\n",
329 priv->chain_noise_data.state);
330 memcpy(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd));
331 } else
332 IWL_ERR(priv, "set power fail, ret = %d", ret);
333 }
334
335 return ret;
336 }
337 EXPORT_SYMBOL(iwl_power_update_mode);
338
339 bool iwl_ht_enabled(struct iwl_priv *priv)
340 {
341 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
342 struct iwl_tt_restriction *restriction;
343
344 if (!priv->thermal_throttle.advanced_tt)
345 return true;
346 restriction = tt->restriction + tt->state;
347 return restriction->is_ht;
348 }
349 EXPORT_SYMBOL(iwl_ht_enabled);
350
351 enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
352 {
353 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
354 struct iwl_tt_restriction *restriction;
355
356 if (!priv->thermal_throttle.advanced_tt)
357 return IWL_ANT_OK_MULTI;
358 restriction = tt->restriction + tt->state;
359 return restriction->tx_stream;
360 }
361 EXPORT_SYMBOL(iwl_tx_ant_restriction);
362
363 enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
364 {
365 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
366 struct iwl_tt_restriction *restriction;
367
368 if (!priv->thermal_throttle.advanced_tt)
369 return IWL_ANT_OK_MULTI;
370 restriction = tt->restriction + tt->state;
371 return restriction->rx_stream;
372 }
373
374 #define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
375
376 /*
377 * toggle the bit to wake up uCode and check the temperature
378 * if the temperature is below CT, uCode will stay awake and send card
379 * state notification with CT_KILL bit clear to inform Thermal Throttling
380 * Management to change state. Otherwise, uCode will go back to sleep
381 * without doing anything, driver should continue the 5 seconds timer
382 * to wake up uCode for temperature check until temperature drop below CT
383 */
384 static void iwl_tt_check_exit_ct_kill(unsigned long data)
385 {
386 struct iwl_priv *priv = (struct iwl_priv *)data;
387 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
388 unsigned long flags;
389
390 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
391 return;
392
393 if (tt->state == IWL_TI_CT_KILL) {
394 if (priv->thermal_throttle.ct_kill_toggle) {
395 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
396 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
397 priv->thermal_throttle.ct_kill_toggle = false;
398 } else {
399 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
400 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
401 priv->thermal_throttle.ct_kill_toggle = true;
402 }
403 iwl_read32(priv, CSR_UCODE_DRV_GP1);
404 spin_lock_irqsave(&priv->reg_lock, flags);
405 if (!iwl_grab_nic_access(priv))
406 iwl_release_nic_access(priv);
407 spin_unlock_irqrestore(&priv->reg_lock, flags);
408
409 /* Reschedule the ct_kill timer to occur in
410 * CT_KILL_EXIT_DURATION seconds to ensure we get a
411 * thermal update */
412 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
413 CT_KILL_EXIT_DURATION * HZ);
414 }
415 }
416
417 static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
418 bool stop)
419 {
420 if (stop) {
421 IWL_DEBUG_POWER(priv, "Stop all queues\n");
422 if (priv->mac80211_registered)
423 ieee80211_stop_queues(priv->hw);
424 IWL_DEBUG_POWER(priv,
425 "Schedule 5 seconds CT_KILL Timer\n");
426 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
427 CT_KILL_EXIT_DURATION * HZ);
428 } else {
429 IWL_DEBUG_POWER(priv, "Wake all queues\n");
430 if (priv->mac80211_registered)
431 ieee80211_wake_queues(priv->hw);
432 }
433 }
434
435 #define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
436 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
437 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
438
439 /*
440 * Legacy thermal throttling
441 * 1) Avoid NIC destruction due to high temperatures
442 * Chip will identify dangerously high temperatures that can
443 * harm the device and will power down
444 * 2) Avoid the NIC power down due to high temperature
445 * Throttle early enough to lower the power consumption before
446 * drastic steps are needed
447 */
448 static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp)
449 {
450 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
451 enum iwl_tt_state old_state;
452
453 #ifdef CONFIG_IWLWIFI_DEBUG
454 if ((tt->tt_previous_temp) &&
455 (temp > tt->tt_previous_temp) &&
456 ((temp - tt->tt_previous_temp) >
457 IWL_TT_INCREASE_MARGIN)) {
458 IWL_DEBUG_POWER(priv,
459 "Temperature increase %d degree Celsius\n",
460 (temp - tt->tt_previous_temp));
461 }
462 #endif
463 old_state = tt->state;
464 /* in Celsius */
465 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
466 tt->state = IWL_TI_CT_KILL;
467 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
468 tt->state = IWL_TI_2;
469 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
470 tt->state = IWL_TI_1;
471 else
472 tt->state = IWL_TI_0;
473
474 #ifdef CONFIG_IWLWIFI_DEBUG
475 tt->tt_previous_temp = temp;
476 #endif
477 if (tt->state != old_state) {
478 switch (tt->state) {
479 case IWL_TI_0:
480 /*
481 * When the system is ready to go back to IWL_TI_0
482 * we only have to call iwl_power_update_mode() to
483 * do so.
484 */
485 break;
486 case IWL_TI_1:
487 tt->tt_power_mode = IWL_POWER_INDEX_3;
488 break;
489 case IWL_TI_2:
490 tt->tt_power_mode = IWL_POWER_INDEX_4;
491 break;
492 default:
493 tt->tt_power_mode = IWL_POWER_INDEX_5;
494 break;
495 }
496 mutex_lock(&priv->mutex);
497 if (iwl_power_update_mode(priv, true)) {
498 /* TT state not updated
499 * try again during next temperature read
500 */
501 tt->state = old_state;
502 IWL_ERR(priv, "Cannot update power mode, "
503 "TT state not updated\n");
504 } else {
505 if (tt->state == IWL_TI_CT_KILL)
506 iwl_perform_ct_kill_task(priv, true);
507 else if (old_state == IWL_TI_CT_KILL &&
508 tt->state != IWL_TI_CT_KILL)
509 iwl_perform_ct_kill_task(priv, false);
510 IWL_DEBUG_POWER(priv, "Temperature state changed %u\n",
511 tt->state);
512 IWL_DEBUG_POWER(priv, "Power Index change to %u\n",
513 tt->tt_power_mode);
514 }
515 mutex_unlock(&priv->mutex);
516 }
517 }
518
519 /*
520 * Advance thermal throttling
521 * 1) Avoid NIC destruction due to high temperatures
522 * Chip will identify dangerously high temperatures that can
523 * harm the device and will power down
524 * 2) Avoid the NIC power down due to high temperature
525 * Throttle early enough to lower the power consumption before
526 * drastic steps are needed
527 * Actions include relaxing the power down sleep thresholds and
528 * decreasing the number of TX streams
529 * 3) Avoid throughput performance impact as much as possible
530 *
531 *=============================================================================
532 * Condition Nxt State Condition Nxt State Condition Nxt State
533 *-----------------------------------------------------------------------------
534 * IWL_TI_0 T >= 115 CT_KILL 115>T>=105 TI_1 N/A N/A
535 * IWL_TI_1 T >= 115 CT_KILL 115>T>=110 TI_2 T<=95 TI_0
536 * IWL_TI_2 T >= 115 CT_KILL T<=100 TI_1
537 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
538 *=============================================================================
539 */
540 static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp)
541 {
542 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
543 int i;
544 bool changed = false;
545 enum iwl_tt_state old_state;
546 struct iwl_tt_trans *transaction;
547
548 old_state = tt->state;
549 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
550 /* based on the current TT state,
551 * find the curresponding transaction table
552 * each table has (IWL_TI_STATE_MAX - 1) entries
553 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
554 * will advance to the correct table.
555 * then based on the current temperature
556 * find the next state need to transaction to
557 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
558 * in the current table to see if transaction is needed
559 */
560 transaction = tt->transaction +
561 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
562 if (temp >= transaction->tt_low &&
563 temp <= transaction->tt_high) {
564 #ifdef CONFIG_IWLWIFI_DEBUG
565 if ((tt->tt_previous_temp) &&
566 (temp > tt->tt_previous_temp) &&
567 ((temp - tt->tt_previous_temp) >
568 IWL_TT_INCREASE_MARGIN)) {
569 IWL_DEBUG_POWER(priv,
570 "Temperature increase %d "
571 "degree Celsius\n",
572 (temp - tt->tt_previous_temp));
573 }
574 tt->tt_previous_temp = temp;
575 #endif
576 if (old_state !=
577 transaction->next_state) {
578 changed = true;
579 tt->state =
580 transaction->next_state;
581 }
582 break;
583 }
584 }
585 if (changed) {
586 struct iwl_rxon_cmd *rxon = &priv->staging_rxon;
587
588 if (tt->state >= IWL_TI_1) {
589 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
590 tt->tt_power_mode = IWL_POWER_INDEX_5;
591 if (!iwl_ht_enabled(priv))
592 /* disable HT */
593 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
594 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
595 RXON_FLG_HT40_PROT_MSK |
596 RXON_FLG_HT_PROT_MSK);
597 else {
598 /* check HT capability and set
599 * according to the system HT capability
600 * in case get disabled before */
601 iwl_set_rxon_ht(priv, &priv->current_ht_config);
602 }
603
604 } else {
605 /*
606 * restore system power setting -- it will be
607 * recalculated automatically.
608 */
609
610 /* check HT capability and set
611 * according to the system HT capability
612 * in case get disabled before */
613 iwl_set_rxon_ht(priv, &priv->current_ht_config);
614 }
615 mutex_lock(&priv->mutex);
616 if (iwl_power_update_mode(priv, true)) {
617 /* TT state not updated
618 * try again during next temperature read
619 */
620 IWL_ERR(priv, "Cannot update power mode, "
621 "TT state not updated\n");
622 tt->state = old_state;
623 } else {
624 IWL_DEBUG_POWER(priv,
625 "Thermal Throttling to new state: %u\n",
626 tt->state);
627 if (old_state != IWL_TI_CT_KILL &&
628 tt->state == IWL_TI_CT_KILL) {
629 IWL_DEBUG_POWER(priv, "Enter IWL_TI_CT_KILL\n");
630 iwl_perform_ct_kill_task(priv, true);
631
632 } else if (old_state == IWL_TI_CT_KILL &&
633 tt->state != IWL_TI_CT_KILL) {
634 IWL_DEBUG_POWER(priv, "Exit IWL_TI_CT_KILL\n");
635 iwl_perform_ct_kill_task(priv, false);
636 }
637 }
638 mutex_unlock(&priv->mutex);
639 }
640 }
641
642 /* Card State Notification indicated reach critical temperature
643 * if PSP not enable, no Thermal Throttling function will be performed
644 * just set the GP1 bit to acknowledge the event
645 * otherwise, go into IWL_TI_CT_KILL state
646 * since Card State Notification will not provide any temperature reading
647 * for Legacy mode
648 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
649 * for advance mode
650 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
651 */
652 static void iwl_bg_ct_enter(struct work_struct *work)
653 {
654 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
655 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
656
657 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
658 return;
659
660 if (!iwl_is_ready(priv))
661 return;
662
663 if (tt->state != IWL_TI_CT_KILL) {
664 IWL_ERR(priv, "Device reached critical temperature "
665 "- ucode going to sleep!\n");
666 if (!priv->thermal_throttle.advanced_tt)
667 iwl_legacy_tt_handler(priv,
668 IWL_MINIMAL_POWER_THRESHOLD);
669 else
670 iwl_advance_tt_handler(priv,
671 CT_KILL_THRESHOLD + 1);
672 }
673 }
674
675 /* Card State Notification indicated out of critical temperature
676 * since Card State Notification will not provide any temperature reading
677 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
678 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
679 */
680 static void iwl_bg_ct_exit(struct work_struct *work)
681 {
682 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
683 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
684
685 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
686 return;
687
688 if (!iwl_is_ready(priv))
689 return;
690
691 /* stop ct_kill_exit_tm timer */
692 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
693
694 if (tt->state == IWL_TI_CT_KILL) {
695 IWL_ERR(priv,
696 "Device temperature below critical"
697 "- ucode awake!\n");
698 if (!priv->thermal_throttle.advanced_tt)
699 iwl_legacy_tt_handler(priv,
700 IWL_REDUCED_PERFORMANCE_THRESHOLD_2);
701 else
702 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD);
703 }
704 }
705
706 void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
707 {
708 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
709 return;
710
711 IWL_DEBUG_POWER(priv, "Queueing critical temperature enter.\n");
712 queue_work(priv->workqueue, &priv->ct_enter);
713 }
714 EXPORT_SYMBOL(iwl_tt_enter_ct_kill);
715
716 void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
717 {
718 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
719 return;
720
721 IWL_DEBUG_POWER(priv, "Queueing critical temperature exit.\n");
722 queue_work(priv->workqueue, &priv->ct_exit);
723 }
724 EXPORT_SYMBOL(iwl_tt_exit_ct_kill);
725
726 static void iwl_bg_tt_work(struct work_struct *work)
727 {
728 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
729 s32 temp = priv->temperature; /* degrees CELSIUS except 4965 */
730
731 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
732 return;
733
734 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
735 temp = KELVIN_TO_CELSIUS(priv->temperature);
736
737 if (!priv->thermal_throttle.advanced_tt)
738 iwl_legacy_tt_handler(priv, temp);
739 else
740 iwl_advance_tt_handler(priv, temp);
741 }
742
743 void iwl_tt_handler(struct iwl_priv *priv)
744 {
745 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
746 return;
747
748 IWL_DEBUG_POWER(priv, "Queueing thermal throttling work.\n");
749 queue_work(priv->workqueue, &priv->tt_work);
750 }
751 EXPORT_SYMBOL(iwl_tt_handler);
752
753 /* Thermal throttling initialization
754 * For advance thermal throttling:
755 * Initialize Thermal Index and temperature threshold table
756 * Initialize thermal throttling restriction table
757 */
758 void iwl_tt_initialize(struct iwl_priv *priv)
759 {
760 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
761 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
762 struct iwl_tt_trans *transaction;
763
764 IWL_DEBUG_POWER(priv, "Initialize Thermal Throttling \n");
765
766 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
767
768 tt->state = IWL_TI_0;
769 init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
770 priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
771 priv->thermal_throttle.ct_kill_exit_tm.function = iwl_tt_check_exit_ct_kill;
772
773 /* setup deferred ct kill work */
774 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
775 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
776 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
777
778 switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
779 case CSR_HW_REV_TYPE_6x00:
780 case CSR_HW_REV_TYPE_6x50:
781 IWL_DEBUG_POWER(priv, "Advanced Thermal Throttling\n");
782 tt->restriction = kzalloc(sizeof(struct iwl_tt_restriction) *
783 IWL_TI_STATE_MAX, GFP_KERNEL);
784 tt->transaction = kzalloc(sizeof(struct iwl_tt_trans) *
785 IWL_TI_STATE_MAX * (IWL_TI_STATE_MAX - 1),
786 GFP_KERNEL);
787 if (!tt->restriction || !tt->transaction) {
788 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
789 priv->thermal_throttle.advanced_tt = false;
790 kfree(tt->restriction);
791 tt->restriction = NULL;
792 kfree(tt->transaction);
793 tt->transaction = NULL;
794 } else {
795 transaction = tt->transaction +
796 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
797 memcpy(transaction, &tt_range_0[0], size);
798 transaction = tt->transaction +
799 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
800 memcpy(transaction, &tt_range_1[0], size);
801 transaction = tt->transaction +
802 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
803 memcpy(transaction, &tt_range_2[0], size);
804 transaction = tt->transaction +
805 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
806 memcpy(transaction, &tt_range_3[0], size);
807 size = sizeof(struct iwl_tt_restriction) *
808 IWL_TI_STATE_MAX;
809 memcpy(tt->restriction,
810 &restriction_range[0], size);
811 priv->thermal_throttle.advanced_tt = true;
812 }
813 break;
814 default:
815 IWL_DEBUG_POWER(priv, "Legacy Thermal Throttling\n");
816 priv->thermal_throttle.advanced_tt = false;
817 break;
818 }
819 }
820 EXPORT_SYMBOL(iwl_tt_initialize);
821
822 /* cleanup thermal throttling management related memory and timer */
823 void iwl_tt_exit(struct iwl_priv *priv)
824 {
825 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
826
827 /* stop ct_kill_exit_tm timer if activated */
828 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
829 cancel_work_sync(&priv->tt_work);
830 cancel_work_sync(&priv->ct_enter);
831 cancel_work_sync(&priv->ct_exit);
832
833 if (priv->thermal_throttle.advanced_tt) {
834 /* free advance thermal throttling memory */
835 kfree(tt->restriction);
836 tt->restriction = NULL;
837 kfree(tt->transaction);
838 tt->transaction = NULL;
839 }
840 }
841 EXPORT_SYMBOL(iwl_tt_exit);
842
843 /* initialize to default */
844 void iwl_power_initialize(struct iwl_priv *priv)
845 {
846 u16 lctl = iwl_pcie_link_ctl(priv);
847
848 priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
849
850 priv->power_data.debug_sleep_level_override = -1;
851
852 memset(&priv->power_data.sleep_cmd, 0,
853 sizeof(priv->power_data.sleep_cmd));
854 }
855 EXPORT_SYMBOL(iwl_power_initialize);
Linux kernel - Deliverables
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