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 .timer = DEVFREQ_TIMER_DELAYED, 85 .polling_ms = 50, /* ~3 frames */ 86 .target = lima_devfreq_target, 87 .get_dev_status = lima_devfreq_get_dev_status, 88 }; 89 90 void lima_devfreq_fini(struct lima_device *ldev) 91 { 92 struct lima_devfreq *devfreq = &ldev->devfreq; 93 94 if (devfreq->cooling) { 95 devfreq_cooling_unregister(devfreq->cooling); 96 devfreq->cooling = NULL; 97 } 98 99 if (devfreq->devfreq) { 100 devm_devfreq_remove_device(ldev->dev, devfreq->devfreq); 101 devfreq->devfreq = NULL; 102 } 103 } 104 105 int lima_devfreq_init(struct lima_device *ldev) 106 { 107 struct thermal_cooling_device *cooling; 108 struct device *dev = ldev->dev; 109 struct devfreq *devfreq; 110 struct lima_devfreq *ldevfreq = &ldev->devfreq; 111 struct dev_pm_opp *opp; 112 unsigned long cur_freq; 113 int ret; 114 115 if (!device_property_present(dev, "operating-points-v2")) 116 /* Optional, continue without devfreq */ 117 return 0; 118 119 spin_lock_init(&ldevfreq->lock); 120 121 ret = devm_pm_opp_set_clkname(dev, "core"); 122 if (ret) 123 return ret; 124 125 ret = devm_pm_opp_set_regulators(dev, (const char *[]){ "mali" }, 1); 126 if (ret) { 127 /* Continue if the optional regulator is missing */ 128 if (ret != -ENODEV) 129 return ret; 130 } 131 132 ret = devm_pm_opp_of_add_table(dev); 133 if (ret) 134 return ret; 135 136 lima_devfreq_reset(ldevfreq); 137 138 cur_freq = clk_get_rate(ldev->clk_gpu); 139 140 opp = devfreq_recommended_opp(dev, &cur_freq, 0); 141 if (IS_ERR(opp)) 142 return PTR_ERR(opp); 143 144 lima_devfreq_profile.initial_freq = cur_freq; 145 dev_pm_opp_put(opp); 146 147 /* 148 * Setup default thresholds for the simple_ondemand governor. 149 * The values are chosen based on experiments. 150 */ 151 ldevfreq->gov_data.upthreshold = 30; 152 ldevfreq->gov_data.downdifferential = 5; 153 154 devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile, 155 DEVFREQ_GOV_SIMPLE_ONDEMAND, 156 &ldevfreq->gov_data); 157 if (IS_ERR(devfreq)) { 158 dev_err(dev, "Couldn't initialize GPU devfreq\n"); 159 return PTR_ERR(devfreq); 160 } 161 162 ldevfreq->devfreq = devfreq; 163 164 cooling = of_devfreq_cooling_register(dev->of_node, devfreq); 165 if (IS_ERR(cooling)) 166 dev_info(dev, "Failed to register cooling device\n"); 167 else 168 ldevfreq->cooling = cooling; 169 170 return 0; 171 } 172 173 void lima_devfreq_record_busy(struct lima_devfreq *devfreq) 174 { 175 unsigned long irqflags; 176 177 if (!devfreq->devfreq) 178 return; 179 180 spin_lock_irqsave(&devfreq->lock, irqflags); 181 182 lima_devfreq_update_utilization(devfreq); 183 184 devfreq->busy_count++; 185 186 spin_unlock_irqrestore(&devfreq->lock, irqflags); 187 } 188 189 void lima_devfreq_record_idle(struct lima_devfreq *devfreq) 190 { 191 unsigned long irqflags; 192 193 if (!devfreq->devfreq) 194 return; 195 196 spin_lock_irqsave(&devfreq->lock, irqflags); 197 198 lima_devfreq_update_utilization(devfreq); 199 200 WARN_ON(--devfreq->busy_count < 0); 201 202 spin_unlock_irqrestore(&devfreq->lock, irqflags); 203 } 204 205 int lima_devfreq_resume(struct lima_devfreq *devfreq) 206 { 207 unsigned long irqflags; 208 209 if (!devfreq->devfreq) 210 return 0; 211 212 spin_lock_irqsave(&devfreq->lock, irqflags); 213 214 lima_devfreq_reset(devfreq); 215 216 spin_unlock_irqrestore(&devfreq->lock, irqflags); 217 218 return devfreq_resume_device(devfreq->devfreq); 219 } 220 221 int lima_devfreq_suspend(struct lima_devfreq *devfreq) 222 { 223 if (!devfreq->devfreq) 224 return 0; 225 226 return devfreq_suspend_device(devfreq->devfreq); 227 } 228