drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c

   1 /*
   2  *
   3  * (C) COPYRIGHT 2014-2015 ARM Limited. All rights reserved.
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * A copy of the licence is included with the program, and can also be obtained
  11  * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  12  * Boston, MA  02110-1301, USA.
  13  *
  14  */
  15
  16
  17 #define ENABLE_DEBUG_LOG
  18 #include "../../platform/rk/custom_log.h"
  19
  20
  21 #include <mali_kbase.h>
  22 #include <mali_kbase_config_defaults.h>
  23 #include <backend/gpu/mali_kbase_pm_internal.h>
  24 #ifdef CONFIG_DEVFREQ_THERMAL
  25 #include <backend/gpu/mali_kbase_power_model_simple.h>
  26 #endif
  27
  28 #include <linux/clk.h>
  29 #include <linux/devfreq.h>
  30 #ifdef CONFIG_DEVFREQ_THERMAL
  31 #include <linux/devfreq_cooling.h>
  32 #endif
  33
  34 #include <linux/version.h>
  35 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)
  36 #include <linux/pm_opp.h>
  37 #else /* Linux >= 3.13 */
  38 /* In 3.13 the OPP include header file, types, and functions were all
  39  * renamed. Use the old filename for the include, and define the new names to
  40  * the old, when an old kernel is detected.
  41  */
  42 #include <linux/opp.h>
  43 #define dev_pm_opp opp
  44 #define dev_pm_opp_get_voltage opp_get_voltage
  45 #define dev_pm_opp_get_opp_count opp_get_opp_count
  46 #define dev_pm_opp_find_freq_ceil opp_find_freq_ceil
  47 #endif /* Linux >= 3.13 */
  48
  49
  50 static int
  51 kbase_devfreq_target(struct device *dev, unsigned long *target_freq, u32 flags)
  52 {
  53         struct kbase_device *kbdev = dev_get_drvdata(dev);
  54         struct dev_pm_opp *opp;
  55         unsigned long freq = 0;
  56         unsigned long voltage;
  57         int err;
  58
  59         freq = *target_freq;
  60
  61         rcu_read_lock();
  62         opp = devfreq_recommended_opp(dev, &freq, flags);
  63         voltage = dev_pm_opp_get_voltage(opp);
  64         rcu_read_unlock();
  65         if (IS_ERR_OR_NULL(opp)) {
  66                 dev_err(dev, "Failed to get opp (%ld)\n", PTR_ERR(opp));
  67                 return PTR_ERR(opp);
  68         }
  69
  70         /*
  71          * Only update if there is a change of frequency
  72          */
  73         if (kbdev->current_freq == freq) {
  74                 *target_freq = freq;
  75                 return 0;
  76         }
  77
  78 #ifdef CONFIG_REGULATOR
  79         if (kbdev->regulator && kbdev->current_voltage != voltage
  80                         && kbdev->current_freq < freq) {
  81                 err = regulator_set_voltage(kbdev->regulator, voltage, voltage);
  82                 if (err) {
  83                         dev_err(dev, "Failed to increase voltage (%d)\n", err);
  84                         return err;
  85                 }
  86         }
  87 #endif
  88
  89         err = clk_set_rate(kbdev->clock, freq);
  90         if (err) {
  91                 dev_err(dev, "Failed to set clock %lu (target %lu)\n",
  92                                 freq, *target_freq);
  93                 return err;
  94         }
  95
  96 #ifdef CONFIG_REGULATOR
  97         if (kbdev->regulator && kbdev->current_voltage != voltage
  98                         && kbdev->current_freq > freq) {
  99                 err = regulator_set_voltage(kbdev->regulator, voltage, voltage);
 100                 if (err) {
 101                         dev_err(dev, "Failed to decrease voltage (%d)\n", err);
 102                         return err;
 103                 }
 104         }
 105 #endif
 106
 107         *target_freq = freq;
 108         kbdev->current_voltage = voltage;
 109         kbdev->current_freq = freq;
 110
 111         kbase_pm_reset_dvfs_utilisation(kbdev);
 112
 113         return err;
 114 }
 115
 116 static int
 117 kbase_devfreq_cur_freq(struct device *dev, unsigned long *freq)
 118 {
 119         struct kbase_device *kbdev = dev_get_drvdata(dev);
 120
 121         *freq = kbdev->current_freq;
 122
 123         return 0;
 124 }
 125
 126 static int
 127 kbase_devfreq_status(struct device *dev, struct devfreq_dev_status *stat)
 128 {
 129         struct kbase_device *kbdev = dev_get_drvdata(dev);
 130
 131         stat->current_frequency = kbdev->current_freq;
 132
 133         kbase_pm_get_dvfs_utilisation(kbdev,
 134                         &stat->total_time, &stat->busy_time);
 135
 136         stat->private_data = NULL;
 137
 138         return 0;
 139 }
 140
 141 static int kbase_devfreq_init_freq_table(struct kbase_device *kbdev,
 142                 struct devfreq_dev_profile *dp)
 143 {
 144         int count;
 145         int i = 0;
 146         unsigned long freq = 0;
 147         struct dev_pm_opp *opp;
 148
 149         rcu_read_lock();
 150         count = dev_pm_opp_get_opp_count(kbdev->dev);
 151         if (count < 0) {
 152                 rcu_read_unlock();
 153                 return count;
 154         }
 155         rcu_read_unlock();
 156
 157         dp->freq_table = kmalloc_array(count, sizeof(dp->freq_table[0]),
 158                                 GFP_KERNEL);
 159         if (!dp->freq_table)
 160                 return -ENOMEM;
 161
 162         rcu_read_lock();
 163         for (i = 0; i < count; i++, freq++) {
 164                 opp = dev_pm_opp_find_freq_ceil(kbdev->dev, &freq);
 165                 if (IS_ERR(opp))
 166                         break;
 167
 168                 dp->freq_table[i] = freq;
 169         }
 170         rcu_read_unlock();
 171
 172         if (count != i)
 173                 dev_warn(kbdev->dev, "Unable to enumerate all OPPs (%d!=%d\n",
 174                                 count, i);
 175
 176         dp->max_state = i;
 177
 178         return 0;
 179 }
 180
 181 static void kbase_devfreq_term_freq_table(struct kbase_device *kbdev)
 182 {
 183         struct devfreq_dev_profile *dp = kbdev->devfreq->profile;
 184
 185         kfree(dp->freq_table);
 186 }
 187
 188 static void kbase_devfreq_exit(struct device *dev)
 189 {
 190         struct kbase_device *kbdev = dev_get_drvdata(dev);
 191
 192         kbase_devfreq_term_freq_table(kbdev);
 193 }
 194
 195 int kbase_devfreq_init(struct kbase_device *kbdev)
 196 {
 197         struct devfreq_dev_profile *dp;
 198         int err;
 199
 200         if (!kbdev->clock)
 201                 return -ENODEV;
 202
 203         kbdev->current_freq = clk_get_rate(kbdev->clock);
 204
 205         dp = &kbdev->devfreq_profile;
 206
 207         dp->initial_freq = kbdev->current_freq;
 208         /* .KP : set devfreq_dvfs_interval_in_ms */
 209         dp->polling_ms = 20;
 210         dp->target = kbase_devfreq_target;
 211         dp->get_dev_status = kbase_devfreq_status;
 212         dp->get_cur_freq = kbase_devfreq_cur_freq;
 213         dp->exit = kbase_devfreq_exit;
 214
 215         if (kbase_devfreq_init_freq_table(kbdev, dp))
 216                 return -EFAULT;
 217
 218         kbdev->devfreq = devfreq_add_device(kbdev->dev, dp,
 219                                 "simple_ondemand", NULL);
 220         if (IS_ERR(kbdev->devfreq)) {
 221                 kbase_devfreq_term_freq_table(kbdev);
 222                 return PTR_ERR(kbdev->devfreq);
 223         }
 224
 225         err = devfreq_register_opp_notifier(kbdev->dev, kbdev->devfreq);
 226         if (err) {
 227                 dev_err(kbdev->dev,
 228                         "Failed to register OPP notifier (%d)\n", err);
 229                 goto opp_notifier_failed;
 230         }
 231
 232 #ifdef CONFIG_DEVFREQ_THERMAL
 233         err = kbase_power_model_simple_init(kbdev);
 234         if (err && err != -ENODEV && err != -EPROBE_DEFER) {
 235                 dev_err(kbdev->dev,
 236                         "Failed to initialize simple power model (%d)\n",
 237                         err);
 238                 goto cooling_failed;
 239         }
 240         if (err == -EPROBE_DEFER)
 241                 goto cooling_failed;
 242         if (err != -ENODEV) {
 243                 kbdev->devfreq_cooling = of_devfreq_cooling_register_power(
 244                                 kbdev->dev->of_node,
 245                                 kbdev->devfreq,
 246                                 &power_model_simple_ops);
 247                 if (IS_ERR_OR_NULL(kbdev->devfreq_cooling)) {
 248                         err = PTR_ERR(kbdev->devfreq_cooling);
 249                         dev_err(kbdev->dev,
 250                                 "Failed to register cooling device (%d)\n",
 251                                 err);
 252                         goto cooling_failed;
 253                 }
 254         } else {
 255                 err = 0;
 256         }
 257         I("success initing power_model_simple.");
 258 #endif
 259
 260         return 0;
 261
 262 #ifdef CONFIG_DEVFREQ_THERMAL
 263 cooling_failed:
 264         devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
 265 #endif /* CONFIG_DEVFREQ_THERMAL */
 266 opp_notifier_failed:
 267         if (devfreq_remove_device(kbdev->devfreq))
 268                 dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
 269         else
 270                 kbdev->devfreq = NULL;
 271
 272         return err;
 273 }
 274
 275 void kbase_devfreq_term(struct kbase_device *kbdev)
 276 {
 277         int err;
 278
 279         dev_dbg(kbdev->dev, "Term Mali devfreq\n");
 280
 281 #ifdef CONFIG_DEVFREQ_THERMAL
 282         if (kbdev->devfreq_cooling)
 283                 devfreq_cooling_unregister(kbdev->devfreq_cooling);
 284 #endif
 285
 286         devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
 287
 288         err = devfreq_remove_device(kbdev->devfreq);
 289         if (err)
 290                 dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
 291         else
 292                 kbdev->devfreq = NULL;
 293 }