1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com> 4 * 5 * Based on panfrost_devfreq.c: 6 * Copyright 2019 Collabora ltd. 7 */ 8 #include <linux/clk.h> 9 #include <linux/devfreq.h> 10 #include <linux/devfreq_cooling.h> 11 #include <linux/device.h> 12 #include <linux/platform_device.h> 13 #include <linux/pm_opp.h> 14 #include <linux/property.h> 15 16 #include "lima_device.h" 17 #include "lima_devfreq.h" 18 19 static void lima_devfreq_update_utilization(struct lima_devfreq *devfreq) 20 { 21 ktime_t now, last; 22 23 now = ktime_get(); 24 last = devfreq->time_last_update; 25 26 if (devfreq->busy_count > 0) 27 devfreq->busy_time += ktime_sub(now, last); 28 else 29 devfreq->idle_time += ktime_sub(now, last); 30 31 devfreq->time_last_update = now; 32 } 33 34 static int lima_devfreq_target(struct device *dev, unsigned long *freq, 35 u32 flags) 36 { 37 struct dev_pm_opp *opp; 38 39 opp = devfreq_recommended_opp(dev, freq, flags); 40 if (IS_ERR(opp)) 41 return PTR_ERR(opp); 42 dev_pm_opp_put(opp); 43 44 return dev_pm_opp_set_rate(dev, *freq); 45 } 46 47 static void lima_devfreq_reset(struct lima_devfreq *devfreq) 48 { 49 devfreq->busy_time = 0; 50 devfreq->idle_time = 0; 51 devfreq->time_last_update = ktime_get(); 52 } 53 54 static int lima_devfreq_get_dev_status(struct device *dev, 55 struct devfreq_dev_status *status) 56 { 57 struct lima_device *ldev = dev_get_drvdata(dev); 58 struct lima_devfreq *devfreq = &ldev->devfreq; 59 unsigned long irqflags; 60 61 status->current_frequency = clk_get_rate(ldev->clk_gpu); 62 63 spin_lock_irqsave(&devfreq->lock, irqflags); 64 65 lima_devfreq_update_utilization(devfreq); 66 67 status->total_time = ktime_to_ns(ktime_add(devfreq->busy_time, 68 devfreq->idle_time)); 69 status->busy_time = ktime_to_ns(devfreq->busy_time); 70 71 lima_devfreq_reset(devfreq); 72 73 spin_unlock_irqrestore(&devfreq->lock, irqflags); 74 75 dev_dbg(ldev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", 76 status->busy_time, status->total_time, 77 status->busy_time / (status->total_time / 100), 78 status->current_frequency / 1000 / 1000); 79 80 return 0; 81 } 82 83 static struct devfreq_dev_profile lima_devfreq_profile = { 84 .polling_ms = 50, /* ~3 frames */ 85 .target = lima_devfreq_target, 86 .get_dev_status = lima_devfreq_get_dev_status, 87 }; 88 89 void lima_devfreq_fini(struct lima_device *ldev) 90 { 91 struct lima_devfreq *devfreq = &ldev->devfreq; 92 93 if (devfreq->cooling) { 94 devfreq_cooling_unregister(devfreq->cooling); 95 devfreq->cooling = NULL; 96 } 97 98 if (devfreq->devfreq) { 99 devm_devfreq_remove_device(ldev->dev, devfreq->devfreq); 100 devfreq->devfreq = NULL; 101 } 102 } 103 104 int lima_devfreq_init(struct lima_device *ldev) 105 { 106 struct thermal_cooling_device *cooling; 107 struct device *dev = ldev->dev; 108 struct devfreq *devfreq; 109 struct lima_devfreq *ldevfreq = &ldev->devfreq; 110 struct dev_pm_opp *opp; 111 unsigned long cur_freq; 112 int ret; 113 114 if (!device_property_present(dev, "operating-points-v2")) 115 /* Optional, continue without devfreq */ 116 return 0; 117 118 spin_lock_init(&ldevfreq->lock); 119 120 ret = devm_pm_opp_set_clkname(dev, "core"); 121 if (ret) 122 return ret; 123 124 ret = devm_pm_opp_set_regulators(dev, (const char *[]){ "mali" }, 1); 125 if (ret) { 126 /* Continue if the optional regulator is missing */ 127 if (ret != -ENODEV) 128 return ret; 129 } 130 131 ret = devm_pm_opp_of_add_table(dev); 132 if (ret) 133 return ret; 134 135 lima_devfreq_reset(ldevfreq); 136 137 cur_freq = clk_get_rate(ldev->clk_gpu); 138 139 opp = devfreq_recommended_opp(dev, &cur_freq, 0); 140 if (IS_ERR(opp)) 141 return PTR_ERR(opp); 142 143 lima_devfreq_profile.initial_freq = cur_freq; 144 dev_pm_opp_put(opp); 145 146 devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile, 147 DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL); 148 if (IS_ERR(devfreq)) { 149 dev_err(dev, "Couldn't initialize GPU devfreq\n"); 150 return PTR_ERR(devfreq); 151 } 152 153 ldevfreq->devfreq = devfreq; 154 155 cooling = of_devfreq_cooling_register(dev->of_node, devfreq); 156 if (IS_ERR(cooling)) 157 dev_info(dev, "Failed to register cooling device\n"); 158 else 159 ldevfreq->cooling = cooling; 160 161 return 0; 162 } 163 164 void lima_devfreq_record_busy(struct lima_devfreq *devfreq) 165 { 166 unsigned long irqflags; 167 168 if (!devfreq->devfreq) 169 return; 170 171 spin_lock_irqsave(&devfreq->lock, irqflags); 172 173 lima_devfreq_update_utilization(devfreq); 174 175 devfreq->busy_count++; 176 177 spin_unlock_irqrestore(&devfreq->lock, irqflags); 178 } 179 180 void lima_devfreq_record_idle(struct lima_devfreq *devfreq) 181 { 182 unsigned long irqflags; 183 184 if (!devfreq->devfreq) 185 return; 186 187 spin_lock_irqsave(&devfreq->lock, irqflags); 188 189 lima_devfreq_update_utilization(devfreq); 190 191 WARN_ON(--devfreq->busy_count < 0); 192 193 spin_unlock_irqrestore(&devfreq->lock, irqflags); 194 } 195 196 int lima_devfreq_resume(struct lima_devfreq *devfreq) 197 { 198 unsigned long irqflags; 199 200 if (!devfreq->devfreq) 201 return 0; 202 203 spin_lock_irqsave(&devfreq->lock, irqflags); 204 205 lima_devfreq_reset(devfreq); 206 207 spin_unlock_irqrestore(&devfreq->lock, irqflags); 208 209 return devfreq_resume_device(devfreq->devfreq); 210 } 211 212 int lima_devfreq_suspend(struct lima_devfreq *devfreq) 213 { 214 if (!devfreq->devfreq) 215 return 0; 216 217 return devfreq_suspend_device(devfreq->devfreq); 218 } 219