1 files changed, 116 insertions, 59 deletions

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 413987038fbf..8ab025d0035f 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -1,20 +1,29 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright 2019 Collabora ltd. */
+
+#include <linux/clk.h>
 #include <linux/devfreq.h>
 #include <linux/devfreq_cooling.h>
 #include <linux/platform_device.h>
 #include <linux/pm_opp.h>
-#include <linux/clk.h>
-#include <linux/regulator/consumer.h>
 
 #include "panfrost_device.h"
 #include "panfrost_devfreq.h"
-#include "panfrost_features.h"
-#include "panfrost_issues.h"
-#include "panfrost_gpu.h"
-#include "panfrost_regs.h"
 
-static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev);
+static void panfrost_devfreq_update_utilization(struct panfrost_devfreq *pfdevfreq)
+{
+	ktime_t now, last;
+
+	now = ktime_get();
+	last = pfdevfreq->time_last_update;
+
+	if (pfdevfreq->busy_count > 0)
+		pfdevfreq->busy_time += ktime_sub(now, last);
+	else
+		pfdevfreq->idle_time += ktime_sub(now, last);
+
+	pfdevfreq->time_last_update = now;
+}
 
 static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
 				   u32 flags)
@@ -34,30 +43,37 @@ static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
 	return 0;
 }
 
-static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
+static void panfrost_devfreq_reset(struct panfrost_devfreq *pfdevfreq)
 {
-	pfdev->devfreq.busy_time = 0;
-	pfdev->devfreq.idle_time = 0;
-	pfdev->devfreq.time_last_update = ktime_get();
+	pfdevfreq->busy_time = 0;
+	pfdevfreq->idle_time = 0;
+	pfdevfreq->time_last_update = ktime_get();
 }
 
 static int panfrost_devfreq_get_dev_status(struct device *dev,
 					   struct devfreq_dev_status *status)
 {
 	struct panfrost_device *pfdev = dev_get_drvdata(dev);
-
-	panfrost_devfreq_update_utilization(pfdev);
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+	unsigned long irqflags;
 
 	status->current_frequency = clk_get_rate(pfdev->clock);
-	status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.busy_time,
-						   pfdev->devfreq.idle_time));
 
-	status->busy_time = ktime_to_ns(pfdev->devfreq.busy_time);
+	spin_lock_irqsave(&pfdevfreq->lock, irqflags);
+
+	panfrost_devfreq_update_utilization(pfdevfreq);
+
+	status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
+						   pfdevfreq->idle_time));
+
+	status->busy_time = ktime_to_ns(pfdevfreq->busy_time);
+
+	panfrost_devfreq_reset(pfdevfreq);
 
-	panfrost_devfreq_reset(pfdev);
+	spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
 
-	dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
-		status->total_time,
+	dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
+		status->busy_time, status->total_time,
 		status->busy_time / (status->total_time / 100),
 		status->current_frequency / 1000 / 1000);
 
@@ -77,21 +93,43 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	unsigned long cur_freq;
 	struct device *dev = &pfdev->pdev->dev;
 	struct devfreq *devfreq;
+	struct opp_table *opp_table;
 	struct thermal_cooling_device *cooling;
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	opp_table = dev_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
+					      pfdev->comp->num_supplies);
+	if (IS_ERR(opp_table)) {
+		ret = PTR_ERR(opp_table);
+		/* Continue if the optional regulator is missing */
+		if (ret != -ENODEV) {
+			DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
+			goto err_fini;
+		}
+	} else {
+		pfdevfreq->regulators_opp_table = opp_table;
+	}
 
 	ret = dev_pm_opp_of_add_table(dev);
-	if (ret == -ENODEV) /* Optional, continue without devfreq */
-		return 0;
-	else if (ret)
-		return ret;
+	if (ret) {
+		/* Optional, continue without devfreq */
+		if (ret == -ENODEV)
+			ret = 0;
+		goto err_fini;
+	}
+	pfdevfreq->opp_of_table_added = true;
+
+	spin_lock_init(&pfdevfreq->lock);
 
-	panfrost_devfreq_reset(pfdev);
+	panfrost_devfreq_reset(pfdevfreq);
 
 	cur_freq = clk_get_rate(pfdev->clock);
 
 	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
-	if (IS_ERR(opp))
-		return PTR_ERR(opp);
+	if (IS_ERR(opp)) {
+		ret = PTR_ERR(opp);
+		goto err_fini;
+	}
 
 	panfrost_devfreq_profile.initial_freq = cur_freq;
 	dev_pm_opp_put(opp);
@@ -100,75 +138,94 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
 	if (IS_ERR(devfreq)) {
 		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
-		dev_pm_opp_of_remove_table(dev);
-		return PTR_ERR(devfreq);
+		ret = PTR_ERR(devfreq);
+		goto err_fini;
 	}
-	pfdev->devfreq.devfreq = devfreq;
+	pfdevfreq->devfreq = devfreq;
 
 	cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
 	if (IS_ERR(cooling))
 		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
 	else
-		pfdev->devfreq.cooling = cooling;
+		pfdevfreq->cooling = cooling;
 
 	return 0;
+
+err_fini:
+	panfrost_devfreq_fini(pfdev);
+	return ret;
 }
 
 void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 {
-	if (pfdev->devfreq.cooling)
-		devfreq_cooling_unregister(pfdev->devfreq.cooling);
-	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (pfdevfreq->cooling) {
+		devfreq_cooling_unregister(pfdevfreq->cooling);
+		pfdevfreq->cooling = NULL;
+	}
+
+	if (pfdevfreq->opp_of_table_added) {
+		dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
+		pfdevfreq->opp_of_table_added = false;
+	}
+
+	if (pfdevfreq->regulators_opp_table) {
+		dev_pm_opp_put_regulators(pfdevfreq->regulators_opp_table);
+		pfdevfreq->regulators_opp_table = NULL;
+	}
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
 {
-	if (!pfdev->devfreq.devfreq)
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (!pfdevfreq->devfreq)
 		return;
 
-	panfrost_devfreq_reset(pfdev);
+	panfrost_devfreq_reset(pfdevfreq);
 
-	devfreq_resume_device(pfdev->devfreq.devfreq);
+	devfreq_resume_device(pfdevfreq->devfreq);
 }
 
 void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
 {
-	if (!pfdev->devfreq.devfreq)
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (!pfdevfreq->devfreq)
 		return;
 
-	devfreq_suspend_device(pfdev->devfreq.devfreq);
+	devfreq_suspend_device(pfdevfreq->devfreq);
 }
 
-static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev)
+void panfrost_devfreq_record_busy(struct panfrost_devfreq *pfdevfreq)
 {
-	ktime_t now;
-	ktime_t last;
+	unsigned long irqflags;
 
-	if (!pfdev->devfreq.devfreq)
+	if (!pfdevfreq->devfreq)
 		return;
 
-	now = ktime_get();
-	last = pfdev->devfreq.time_last_update;
+	spin_lock_irqsave(&pfdevfreq->lock, irqflags);
 
-	if (atomic_read(&pfdev->devfreq.busy_count) > 0)
-		pfdev->devfreq.busy_time += ktime_sub(now, last);
-	else
-		pfdev->devfreq.idle_time += ktime_sub(now, last);
+	panfrost_devfreq_update_utilization(pfdevfreq);
 
-	pfdev->devfreq.time_last_update = now;
-}
+	pfdevfreq->busy_count++;
 
-void panfrost_devfreq_record_busy(struct panfrost_device *pfdev)
-{
-	panfrost_devfreq_update_utilization(pfdev);
-	atomic_inc(&pfdev->devfreq.busy_count);
+	spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
 }
 
-void panfrost_devfreq_record_idle(struct panfrost_device *pfdev)
+void panfrost_devfreq_record_idle(struct panfrost_devfreq *pfdevfreq)
 {
-	int count;
+	unsigned long irqflags;
+
+	if (!pfdevfreq->devfreq)
+		return;
+
+	spin_lock_irqsave(&pfdevfreq->lock, irqflags);
+
+	panfrost_devfreq_update_utilization(pfdevfreq);
+
+	WARN_ON(--pfdevfreq->busy_count < 0);
 
-	panfrost_devfreq_update_utilization(pfdev);
-	count = atomic_dec_if_positive(&pfdev->devfreq.busy_count);
-	WARN_ON(count < 0);
+	spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
 }