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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/drivers/thermal/imx_thermal.c
....@@ -3,25 +3,19 @@
33 // Copyright 2013 Freescale Semiconductor, Inc.
44 
55 #include <linux/clk.h>
6
-#include <linux/cpu.h>
76 #include <linux/cpufreq.h>
87 #include <linux/cpu_cooling.h>
98 #include <linux/delay.h>
10
-#include <linux/device.h>
11
-#include <linux/init.h>
129 #include <linux/interrupt.h>
1310 #include <linux/io.h>
14
-#include <linux/kernel.h>
1511 #include <linux/mfd/syscon.h>
1612 #include <linux/module.h>
1713 #include <linux/of.h>
1814 #include <linux/of_device.h>
19
-#include <linux/platform_device.h>
2015 #include <linux/regmap.h>
21
-#include <linux/slab.h>
2216 #include <linux/thermal.h>
23
-#include <linux/types.h>
2417 #include <linux/nvmem-consumer.h>
18
+#include <linux/pm_runtime.h>
2519 
2620 #define REG_SET		0x4
2721 #define REG_CLR		0x8
....@@ -201,10 +195,10 @@
201195 };
202196 
203197 struct imx_thermal_data {
198
+	struct device *dev;
204199 	struct cpufreq_policy *policy;
205200 	struct thermal_zone_device *tz;
206201 	struct thermal_cooling_device *cdev;
207
-	enum thermal_device_mode mode;
208202 	struct regmap *tempmon;
209203 	u32 c1, c2; /* See formula in imx_init_calib() */
210204 	int temp_passive;
....@@ -260,42 +254,14 @@
260254 	const struct thermal_soc_data *soc_data = data->socdata;
261255 	struct regmap *map = data->tempmon;
262256 	unsigned int n_meas;
263
-	bool wait;
264257 	u32 val;
258
+	int ret;
265259 
266
-	if (data->mode == THERMAL_DEVICE_ENABLED) {
267
-		/* Check if a measurement is currently in progress */
268
-		regmap_read(map, soc_data->temp_data, &val);
269
-		wait = !(val & soc_data->temp_valid_mask);
270
-	} else {
271
-		/*
272
-		 * Every time we measure the temperature, we will power on the
273
-		 * temperature sensor, enable measurements, take a reading,
274
-		 * disable measurements, power off the temperature sensor.
275
-		 */
276
-		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
277
-			    soc_data->power_down_mask);
278
-		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
279
-			    soc_data->measure_temp_mask);
280
-
281
-		wait = true;
282
-	}
283
-
284
-	/*
285
-	 * According to the temp sensor designers, it may require up to ~17us
286
-	 * to complete a measurement.
287
-	 */
288
-	if (wait)
289
-		usleep_range(20, 50);
260
+	ret = pm_runtime_resume_and_get(data->dev);
261
+	if (ret < 0)
262
+		return ret;
290263 
291264 	regmap_read(map, soc_data->temp_data, &val);
292
-
293
-	if (data->mode != THERMAL_DEVICE_ENABLED) {
294
-		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
295
-			     soc_data->measure_temp_mask);
296
-		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
297
-			     soc_data->power_down_mask);
298
-	}
299265 
300266 	if ((val & soc_data->temp_valid_mask) == 0) {
301267 		dev_dbg(&tz->device, "temp measurement never finished\n");
....@@ -335,56 +301,31 @@
335301 		enable_irq(data->irq);
336302 	}
337303 
338
-	return 0;
339
-}
340
-
341
-static int imx_get_mode(struct thermal_zone_device *tz,
342
-			enum thermal_device_mode *mode)
343
-{
344
-	struct imx_thermal_data *data = tz->devdata;
345
-
346
-	*mode = data->mode;
304
+	pm_runtime_put(data->dev);
347305 
348306 	return 0;
349307 }
350308 
351
-static int imx_set_mode(struct thermal_zone_device *tz,
352
-			enum thermal_device_mode mode)
309
+static int imx_change_mode(struct thermal_zone_device *tz,
310
+			   enum thermal_device_mode mode)
353311 {
354312 	struct imx_thermal_data *data = tz->devdata;
355
-	struct regmap *map = data->tempmon;
356
-	const struct thermal_soc_data *soc_data = data->socdata;
357313 
358314 	if (mode == THERMAL_DEVICE_ENABLED) {
359
-		tz->polling_delay = IMX_POLLING_DELAY;
360
-		tz->passive_delay = IMX_PASSIVE_DELAY;
361
-
362
-		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
363
-			     soc_data->power_down_mask);
364
-		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
365
-			     soc_data->measure_temp_mask);
315
+		pm_runtime_get(data->dev);
366316 
367317 		if (!data->irq_enabled) {
368318 			data->irq_enabled = true;
369319 			enable_irq(data->irq);
370320 		}
371321 	} else {
372
-		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
373
-			     soc_data->measure_temp_mask);
374
-		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
375
-			     soc_data->power_down_mask);
376
-
377
-		tz->polling_delay = 0;
378
-		tz->passive_delay = 0;
322
+		pm_runtime_put(data->dev);
379323 
380324 		if (data->irq_enabled) {
381325 			disable_irq(data->irq);
382326 			data->irq_enabled = false;
383327 		}
384328 	}
385
-
386
-	data->mode = mode;
387
-	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
388329 
389330 	return 0;
390331 }
....@@ -419,6 +360,11 @@
419360 			     int temp)
420361 {
421362 	struct imx_thermal_data *data = tz->devdata;
363
+	int ret;
364
+
365
+	ret = pm_runtime_resume_and_get(data->dev);
366
+	if (ret < 0)
367
+		return ret;
422368 
423369 	/* do not allow changing critical threshold */
424370 	if (trip == IMX_TRIP_CRITICAL)
....@@ -431,6 +377,8 @@
431377 	data->temp_passive = temp;
432378 
433379 	imx_set_alarm_temp(data, temp);
380
+
381
+	pm_runtime_put(data->dev);
434382 
435383 	return 0;
436384 }
....@@ -474,8 +422,7 @@
474422 	.bind = imx_bind,
475423 	.unbind = imx_unbind,
476424 	.get_temp = imx_get_temp,
477
-	.get_mode = imx_get_mode,
478
-	.set_mode = imx_set_mode,
425
+	.change_mode = imx_change_mode,
479426 	.get_trip_type = imx_get_trip_type,
480427 	.get_trip_temp = imx_get_trip_temp,
481428 	.get_crit_temp = imx_get_crit_temp,
....@@ -648,26 +595,54 @@
648595 };
649596 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
650597 
598
+#ifdef CONFIG_CPU_FREQ
651599 /*
652600  * Create cooling device in case no #cooling-cells property is available in
653601  * CPU node
654602  */
655603 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
656604 {
657
-	struct device_node *np = of_get_cpu_node(data->policy->cpu, NULL);
658
-	int ret;
605
+	struct device_node *np;
606
+	int ret = 0;
607
+
608
+	data->policy = cpufreq_cpu_get(0);
609
+	if (!data->policy) {
610
+		pr_debug("%s: CPUFreq policy not found\n", __func__);
611
+		return -EPROBE_DEFER;
612
+	}
613
+
614
+	np = of_get_cpu_node(data->policy->cpu, NULL);
659615 
660616 	if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
661617 		data->cdev = cpufreq_cooling_register(data->policy);
662618 		if (IS_ERR(data->cdev)) {
663619 			ret = PTR_ERR(data->cdev);
664620 			cpufreq_cpu_put(data->policy);
665
-			return ret;
666621 		}
667622 	}
668623 
624
+	of_node_put(np);
625
+
626
+	return ret;
627
+}
628
+
629
+static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
630
+{
631
+	cpufreq_cooling_unregister(data->cdev);
632
+	cpufreq_cpu_put(data->policy);
633
+}
634
+
635
+#else
636
+
637
+static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
638
+{
669639 	return 0;
670640 }
641
+
642
+static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
643
+{
644
+}
645
+#endif
671646 
672647 static int imx_thermal_probe(struct platform_device *pdev)
673648 {
....@@ -679,6 +654,8 @@
679654 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
680655 	if (!data)
681656 		return -ENOMEM;
657
+
658
+	data->dev = &pdev->dev;
682659 
683660 	map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
684661 	if (IS_ERR(map)) {
....@@ -715,17 +692,13 @@
715692 
716693 	if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
717694 		ret = imx_init_from_nvmem_cells(pdev);
718
-		if (ret == -EPROBE_DEFER)
719
-			return ret;
720
-		if (ret) {
721
-			dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
722
-				ret);
723
-			return ret;
724
-		}
695
+		if (ret)
696
+			return dev_err_probe(&pdev->dev, ret,
697
+					     "failed to init from nvmem\n");
725698 	} else {
726699 		ret = imx_init_from_tempmon_data(pdev);
727700 		if (ret) {
728
-			dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
701
+			dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
729702 			return ret;
730703 		}
731704 	}
....@@ -743,18 +716,10 @@
743716 	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
744717 		     data->socdata->power_down_mask);
745718 
746
-	data->policy = cpufreq_cpu_get(0);
747
-	if (!data->policy) {
748
-		pr_debug("%s: CPUFreq policy not found\n", __func__);
749
-		return -EPROBE_DEFER;
750
-	}
751
-
752719 	ret = imx_thermal_register_legacy_cooling(data);
753
-	if (ret) {
754
-		dev_err(&pdev->dev,
755
-			"failed to register cpufreq cooling device: %d\n", ret);
756
-		return ret;
757
-	}
720
+	if (ret)
721
+		return dev_err_probe(&pdev->dev, ret,
722
+				     "failed to register cpufreq cooling device\n");
758723 
759724 	data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
760725 	if (IS_ERR(data->thermal_clk)) {
....@@ -762,9 +727,7 @@
762727 		if (ret != -EPROBE_DEFER)
763728 			dev_err(&pdev->dev,
764729 				"failed to get thermal clk: %d\n", ret);
765
-		cpufreq_cooling_unregister(data->cdev);
766
-		cpufreq_cpu_put(data->policy);
767
-		return ret;
730
+		goto legacy_cleanup;
768731 	}
769732 
770733 	/*
....@@ -777,9 +740,7 @@
777740 	ret = clk_prepare_enable(data->thermal_clk);
778741 	if (ret) {
779742 		dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
780
-		cpufreq_cooling_unregister(data->cdev);
781
-		cpufreq_cpu_put(data->policy);
782
-		return ret;
743
+		goto legacy_cleanup;
783744 	}
784745 
785746 	data->tz = thermal_zone_device_register("imx_thermal_zone",
....@@ -792,10 +753,7 @@
792753 		ret = PTR_ERR(data->tz);
793754 		dev_err(&pdev->dev,
794755 			"failed to register thermal zone device %d\n", ret);
795
-		clk_disable_unprepare(data->thermal_clk);
796
-		cpufreq_cooling_unregister(data->cdev);
797
-		cpufreq_cpu_put(data->policy);
798
-		return ret;
756
+		goto clk_disable;
799757 	}
800758 
801759 	dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
....@@ -818,87 +776,148 @@
818776 		     data->socdata->power_down_mask);
819777 	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
820778 		     data->socdata->measure_temp_mask);
779
+	/* After power up, we need a delay before first access can be done. */
780
+	usleep_range(20, 50);
781
+
782
+	/* the core was configured and enabled just before */
783
+	pm_runtime_set_active(&pdev->dev);
784
+	pm_runtime_enable(data->dev);
785
+
786
+	ret = pm_runtime_resume_and_get(data->dev);
787
+	if (ret < 0)
788
+		goto disable_runtime_pm;
821789 
822790 	data->irq_enabled = true;
823
-	data->mode = THERMAL_DEVICE_ENABLED;
791
+	ret = thermal_zone_device_enable(data->tz);
792
+	if (ret)
793
+		goto thermal_zone_unregister;
824794 
825795 	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
826796 			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
827797 			0, "imx_thermal", data);
828798 	if (ret < 0) {
829799 		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
830
-		clk_disable_unprepare(data->thermal_clk);
831
-		thermal_zone_device_unregister(data->tz);
832
-		cpufreq_cooling_unregister(data->cdev);
833
-		cpufreq_cpu_put(data->policy);
834
-		return ret;
800
+		goto thermal_zone_unregister;
835801 	}
836802 
803
+	pm_runtime_put(data->dev);
804
+
837805 	return 0;
806
+
807
+thermal_zone_unregister:
808
+	thermal_zone_device_unregister(data->tz);
809
+disable_runtime_pm:
810
+	pm_runtime_put_noidle(data->dev);
811
+	pm_runtime_disable(data->dev);
812
+clk_disable:
813
+	clk_disable_unprepare(data->thermal_clk);
814
+legacy_cleanup:
815
+	imx_thermal_unregister_legacy_cooling(data);
816
+
817
+	return ret;
838818 }
839819 
840820 static int imx_thermal_remove(struct platform_device *pdev)
841821 {
842822 	struct imx_thermal_data *data = platform_get_drvdata(pdev);
843
-	struct regmap *map = data->tempmon;
844823 
845
-	/* Disable measurements */
846
-	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
847
-		     data->socdata->power_down_mask);
848
-	if (!IS_ERR(data->thermal_clk))
849
-		clk_disable_unprepare(data->thermal_clk);
824
+	pm_runtime_put_noidle(data->dev);
825
+	pm_runtime_disable(data->dev);
850826 
851827 	thermal_zone_device_unregister(data->tz);
852
-	cpufreq_cooling_unregister(data->cdev);
853
-	cpufreq_cpu_put(data->policy);
828
+	imx_thermal_unregister_legacy_cooling(data);
854829 
855830 	return 0;
856831 }
857832 
858
-#ifdef CONFIG_PM_SLEEP
859
-static int imx_thermal_suspend(struct device *dev)
833
+static int __maybe_unused imx_thermal_suspend(struct device *dev)
860834 {
861835 	struct imx_thermal_data *data = dev_get_drvdata(dev);
862
-	struct regmap *map = data->tempmon;
836
+	int ret;
863837 
864838 	/*
865839 	 * Need to disable thermal sensor, otherwise, when thermal core
866840 	 * try to get temperature before thermal sensor resume, a wrong
867841 	 * temperature will be read as the thermal sensor is powered
868
-	 * down.
842
+	 * down. This is done in change_mode() operation called from
843
+	 * thermal_zone_device_disable()
869844 	 */
870
-	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
871
-		     data->socdata->measure_temp_mask);
872
-	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
873
-		     data->socdata->power_down_mask);
874
-	data->mode = THERMAL_DEVICE_DISABLED;
845
+	ret = thermal_zone_device_disable(data->tz);
846
+	if (ret)
847
+		return ret;
848
+
849
+	return pm_runtime_force_suspend(data->dev);
850
+}
851
+
852
+static int __maybe_unused imx_thermal_resume(struct device *dev)
853
+{
854
+	struct imx_thermal_data *data = dev_get_drvdata(dev);
855
+	int ret;
856
+
857
+	ret = pm_runtime_force_resume(data->dev);
858
+	if (ret)
859
+		return ret;
860
+	/* Enabled thermal sensor after resume */
861
+	return thermal_zone_device_enable(data->tz);
862
+}
863
+
864
+static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev)
865
+{
866
+	struct imx_thermal_data *data = dev_get_drvdata(dev);
867
+	const struct thermal_soc_data *socdata = data->socdata;
868
+	struct regmap *map = data->tempmon;
869
+	int ret;
870
+
871
+	ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
872
+			   socdata->measure_temp_mask);
873
+	if (ret)
874
+		return ret;
875
+
876
+	ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
877
+			   socdata->power_down_mask);
878
+	if (ret)
879
+		return ret;
880
+
875881 	clk_disable_unprepare(data->thermal_clk);
876882 
877883 	return 0;
878884 }
879885 
880
-static int imx_thermal_resume(struct device *dev)
886
+static int __maybe_unused imx_thermal_runtime_resume(struct device *dev)
881887 {
882888 	struct imx_thermal_data *data = dev_get_drvdata(dev);
889
+	const struct thermal_soc_data *socdata = data->socdata;
883890 	struct regmap *map = data->tempmon;
884891 	int ret;
885892 
886893 	ret = clk_prepare_enable(data->thermal_clk);
887894 	if (ret)
888895 		return ret;
889
-	/* Enabled thermal sensor after resume */
890
-	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
891
-		     data->socdata->power_down_mask);
892
-	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
893
-		     data->socdata->measure_temp_mask);
894
-	data->mode = THERMAL_DEVICE_ENABLED;
896
+
897
+	ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,
898
+			   socdata->power_down_mask);
899
+	if (ret)
900
+		return ret;
901
+
902
+	ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,
903
+			   socdata->measure_temp_mask);
904
+	if (ret)
905
+		return ret;
906
+
907
+	/*
908
+	 * According to the temp sensor designers, it may require up to ~17us
909
+	 * to complete a measurement.
910
+	 */
911
+	usleep_range(20, 50);
895912 
896913 	return 0;
897914 }
898
-#endif
899915 
900
-static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
901
-			 imx_thermal_suspend, imx_thermal_resume);
916
+static const struct dev_pm_ops imx_thermal_pm_ops = {
917
+	SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)
918
+	SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend,
919
+			   imx_thermal_runtime_resume, NULL)
920
+};
902921 
903922 static struct platform_driver imx_thermal = {
904923 	.driver = {