drivers/gpu/drm/nouveau/core/subdev/therm/fan.c

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  *          Martin Peres
  24  */
  25
  26 #include "priv.h"
  27
  28 #include <core/object.h>
  29 #include <core/device.h>
  30
  31 #include <subdev/gpio.h>
  32 #include <subdev/timer.h>
  33
  34 static int
  35 nouveau_fan_update(struct nouveau_fan *fan, bool immediate, int target)
  36 {
  37         struct nouveau_therm *therm = fan->parent;
  38         struct nouveau_therm_priv *priv = (void *)therm;
  39         struct nouveau_timer *ptimer = nouveau_timer(priv);
  40         unsigned long flags;
  41         int ret = 0;
  42         int duty;
  43
  44         /* update target fan speed, restricting to allowed range */
  45         spin_lock_irqsave(&fan->lock, flags);
  46         if (target < 0)
  47                 target = fan->percent;
  48         target = max_t(u8, target, fan->bios.min_duty);
  49         target = min_t(u8, target, fan->bios.max_duty);
  50         if (fan->percent != target) {
  51                 nv_debug(therm, "FAN target: %d\n", target);
  52                 fan->percent = target;
  53         }
  54
  55         /* check that we're not already at the target duty cycle */
  56         duty = fan->get(therm);
  57         if (duty == target)
  58                 goto done;
  59
  60         /* smooth out the fanspeed increase/decrease */
  61         if (!immediate && duty >= 0) {
  62                 /* the constant "3" is a rough approximation taken from
  63                  * nvidia's behaviour.
  64                  * it is meant to bump the fan speed more incrementally
  65                  */
  66                 if (duty < target)
  67                         duty = min(duty + 3, target);
  68                 else if (duty > target)
  69                         duty = max(duty - 3, target);
  70         } else {
  71                 duty = target;
  72         }
  73
  74         nv_debug(therm, "FAN update: %d\n", duty);
  75         ret = fan->set(therm, duty);
  76         if (ret)
  77                 goto done;
  78
  79         /* schedule next fan update, if not at target speed already */
  80         if (list_empty(&fan->alarm.head) && target != duty) {
  81                 u16 bump_period = fan->bios.bump_period;
  82                 u16 slow_down_period = fan->bios.slow_down_period;
  83                 u64 delay;
  84
  85                 if (duty > target)
  86                         delay = slow_down_period;
  87                 else if (duty == target)
  88                         delay = min(bump_period, slow_down_period) ;
  89                 else
  90                         delay = bump_period;
  91
  92                 ptimer->alarm(ptimer, delay * 1000 * 1000, &fan->alarm);
  93         }
  94
  95 done:
  96         spin_unlock_irqrestore(&fan->lock, flags);
  97         return ret;
  98 }
  99
 100 static void
 101 nouveau_fan_alarm(struct nouveau_alarm *alarm)
 102 {
 103         struct nouveau_fan *fan = container_of(alarm, struct nouveau_fan, alarm);
 104         nouveau_fan_update(fan, false, -1);
 105 }
 106
 107 int
 108 nouveau_therm_fan_get(struct nouveau_therm *therm)
 109 {
 110         struct nouveau_therm_priv *priv = (void *)therm;
 111         return priv->fan->get(therm);
 112 }
 113
 114 int
 115 nouveau_therm_fan_set(struct nouveau_therm *therm, bool immediate, int percent)
 116 {
 117         struct nouveau_therm_priv *priv = (void *)therm;
 118         return nouveau_fan_update(priv->fan, immediate, percent);
 119 }
 120
 121 int
 122 nouveau_therm_fan_sense(struct nouveau_therm *therm)
 123 {
 124         struct nouveau_therm_priv *priv = (void *)therm;
 125         struct nouveau_timer *ptimer = nouveau_timer(therm);
 126         struct nouveau_gpio *gpio = nouveau_gpio(therm);
 127         u32 cycles, cur, prev;
 128         u64 start, end, tach;
 129
 130         if (priv->fan->tach.func == DCB_GPIO_UNUSED)
 131                 return -ENODEV;
 132
 133         /* Time a complete rotation and extrapolate to RPM:
 134          * When the fan spins, it changes the value of GPIO FAN_SENSE.
 135          * We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation.
 136          */
 137         start = ptimer->read(ptimer);
 138         prev = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line);
 139         cycles = 0;
 140         do {
 141                 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
 142
 143                 cur = gpio->get(gpio, 0, priv->fan->tach.func, priv->fan->tach.line);
 144                 if (prev != cur) {
 145                         if (!start)
 146                                 start = ptimer->read(ptimer);
 147                         cycles++;
 148                         prev = cur;
 149                 }
 150         } while (cycles < 5 && ptimer->read(ptimer) - start < 250000000);
 151         end = ptimer->read(ptimer);
 152
 153         if (cycles == 5) {
 154                 tach = (u64)60000000000ULL;
 155                 do_div(tach, (end - start));
 156                 return tach;
 157         } else
 158                 return 0;
 159 }
 160
 161 int
 162 nouveau_therm_fan_user_get(struct nouveau_therm *therm)
 163 {
 164         return nouveau_therm_fan_get(therm);
 165 }
 166
 167 int
 168 nouveau_therm_fan_user_set(struct nouveau_therm *therm, int percent)
 169 {
 170         struct nouveau_therm_priv *priv = (void *)therm;
 171
 172         if (priv->mode != NOUVEAU_THERM_CTRL_MANUAL)
 173                 return -EINVAL;
 174
 175         return nouveau_therm_fan_set(therm, true, percent);
 176 }
 177
 178 static void
 179 nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
 180 {
 181         struct nouveau_therm_priv *priv = (void *)therm;
 182
 183         priv->fan->bios.pwm_freq = 0;
 184         priv->fan->bios.min_duty = 0;
 185         priv->fan->bios.max_duty = 100;
 186         priv->fan->bios.bump_period = 500;
 187         priv->fan->bios.slow_down_period = 2000;
 188 /*XXX: talk to mupuf */
 189 #if 0
 190         priv->fan->bios.linear_min_temp = 40;
 191         priv->fan->bios.linear_max_temp = 85;
 192 #endif
 193 }
 194
 195 static void
 196 nouveau_therm_fan_safety_checks(struct nouveau_therm *therm)
 197 {
 198         struct nouveau_therm_priv *priv = (void *)therm;
 199
 200         if (priv->fan->bios.min_duty > 100)
 201                 priv->fan->bios.min_duty = 100;
 202         if (priv->fan->bios.max_duty > 100)
 203                 priv->fan->bios.max_duty = 100;
 204
 205         if (priv->fan->bios.min_duty > priv->fan->bios.max_duty)
 206                 priv->fan->bios.min_duty = priv->fan->bios.max_duty;
 207 }
 208
 209 int
 210 nouveau_therm_fan_init(struct nouveau_therm *therm)
 211 {
 212         return 0;
 213 }
 214
 215 int
 216 nouveau_therm_fan_fini(struct nouveau_therm *therm, bool suspend)
 217 {
 218         struct nouveau_therm_priv *priv = (void *)therm;
 219         struct nouveau_timer *ptimer = nouveau_timer(therm);
 220
 221         if (suspend)
 222                 ptimer->alarm_cancel(ptimer, &priv->fan->alarm);
 223         return 0;
 224 }
 225
 226 int
 227 nouveau_therm_fan_ctor(struct nouveau_therm *therm)
 228 {
 229         struct nouveau_therm_priv *priv = (void *)therm;
 230         struct nouveau_gpio *gpio = nouveau_gpio(therm);
 231         struct nouveau_bios *bios = nouveau_bios(therm);
 232         struct dcb_gpio_func func;
 233         int ret;
 234
 235         /* attempt to locate a drivable fan, and determine control method */
 236         ret = gpio->find(gpio, 0, DCB_GPIO_FAN, 0xff, &func);
 237         if (ret == 0) {
 238                 if (func.log[0] & DCB_GPIO_LOG_DIR_IN) {
 239                         nv_debug(therm, "GPIO_FAN is in input mode\n");
 240                         ret = -EINVAL;
 241                 } else {
 242                         ret = nouveau_fanpwm_create(therm, &func);
 243                         if (ret != 0)
 244                                 ret = nouveau_fantog_create(therm, &func);
 245                 }
 246         }
 247
 248         /* no controllable fan found, create a dummy fan module */
 249         if (ret != 0) {
 250                 ret = nouveau_fannil_create(therm);
 251                 if (ret)
 252                         return ret;
 253         }
 254
 255         nv_info(therm, "FAN control: %s\n", priv->fan->type);
 256
 257         /* read the current speed, it is useful when resuming */
 258         priv->fan->percent = nouveau_therm_fan_get(therm);
 259
 260         /* attempt to detect a tachometer connection */
 261         ret = gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &priv->fan->tach);
 262         if (ret)
 263                 priv->fan->tach.func = DCB_GPIO_UNUSED;
 264
 265         /* initialise fan bump/slow update handling */
 266         priv->fan->parent = therm;
 267         nouveau_alarm_init(&priv->fan->alarm, nouveau_fan_alarm);
 268         spin_lock_init(&priv->fan->lock);
 269
 270         /* other random init... */
 271         nouveau_therm_fan_set_defaults(therm);
 272         nvbios_perf_fan_parse(bios, &priv->fan->perf);
 273         if (nvbios_therm_fan_parse(bios, &priv->fan->bios))
 274                 nv_error(therm, "parsing the thermal table failed\n");
 275         nouveau_therm_fan_safety_checks(therm);
 276         return 0;
 277 }