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Subject[PATCH RFT v1 3/3] drm/panfrost: Use the mali-supply regulator for control again
Date
dev_pm_opp_set_rate() needs a reference to the regulator which should be
updated when updating the GPU frequency. The name of the regulator has
to be passed at initialization-time using dev_pm_opp_set_regulators().
Add the call to dev_pm_opp_set_regulators() so dev_pm_opp_set_rate()
will update the GPU regulator when updating the frequency (just like
we did this manually before when we open-coded dev_pm_opp_set_rate()).

Fixes: 221bc77914cbcc ("drm/panfrost: Use generic code for devfreq")
Reported-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
drivers/gpu/drm/panfrost/panfrost_devfreq.c | 22 ++++++++++++++++++++-
drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 170f6c8c9651..4f7999c7b44c 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -74,6 +74,7 @@ static struct devfreq_dev_profile panfrost_devfreq_profile = {
int panfrost_devfreq_init(struct panfrost_device *pfdev)
{
int ret;
+ struct opp_table *opp_table;
struct dev_pm_opp *opp;
unsigned long cur_freq;
struct device *dev = &pfdev->pdev->dev;
@@ -84,9 +85,24 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
/* Optional, continue without devfreq */
return 0;

+ opp_table = dev_pm_opp_set_regulators(dev,
+ (const char *[]){ "mali" },
+ 1);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+
+ /* Continue if the optional regulator is missing */
+ if (ret != -ENODEV)
+ return ret;
+ } else {
+ pfdev->devfreq.regulators_opp_table = opp_table;
+ }
+
ret = dev_pm_opp_of_add_table(dev);
- if (ret)
+ if (ret) {
+ dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
return ret;
+ }

panfrost_devfreq_reset(pfdev);

@@ -95,6 +111,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
opp = devfreq_recommended_opp(dev, &cur_freq, 0);
if (IS_ERR(opp)) {
dev_pm_opp_of_remove_table(dev);
+ dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
return PTR_ERR(opp);
}

@@ -106,6 +123,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
if (IS_ERR(devfreq)) {
DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
dev_pm_opp_of_remove_table(dev);
+ dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
return PTR_ERR(devfreq);
}
pfdev->devfreq.devfreq = devfreq;
@@ -124,6 +142,8 @@ 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);
+ if (pfdev->devfreq.regulators_opp_table)
+ dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
}

void panfrost_devfreq_resume(struct panfrost_device *pfdev)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 06713811b92c..4878b239e301 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -85,6 +85,7 @@ struct panfrost_device {

struct {
struct devfreq *devfreq;
+ struct opp_table *regulators_opp_table;
struct thermal_cooling_device *cooling;
ktime_t busy_time;
ktime_t idle_time;
--
2.24.1
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