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drm/panfrost: Fix incorrect updating of current device frequency

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It was noticed when setting the Panfrost's DVFS device to the performant
governor, GPU frequency as reported by fdinfo had dropped to 0 permamently.

There are two separate issues causing this behaviour:
 - Not initialising the device's current_frequency variable to its original
 value during device probe().
 - Updating said variable in Panfrost devfreq's get_dev_status() rather
 than after the new OPP's frequency had been retrieved in target(), which
 meant the old frequency would be assigned instead.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Fixes: f11b0417ee ("drm/panfrost: Add fdinfo support GPU load metrics")
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231125205438.375407-3-adrian.larumbe@collabora.com
This commit is contained in:
Adrián Larumbe 2023-11-25 20:52:03 +00:00 committed by Steven Price
parent 7701ce26c7
commit 64111a0e22
1 changed files with 15 additions and 2 deletions
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17
drivers/gpu/drm/panfrost/panfrost_devfreq.c
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@ -29,14 +29,20 @@ static void panfrost_devfreq_update_utilization(struct panfrost_devfreq *pfdevfr
static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct panfrost_device *ptdev = dev_get_drvdata(dev);
struct dev_pm_opp *opp;
int err;
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
return dev_pm_opp_set_rate(dev, *freq);
err = dev_pm_opp_set_rate(dev, *freq);
if (!err)
ptdev->pfdevfreq.current_frequency = *freq;
return err;
}
static void panfrost_devfreq_reset(struct panfrost_devfreq *pfdevfreq)
@ -58,7 +64,6 @@ static int panfrost_devfreq_get_dev_status(struct device *dev,
spin_lock_irqsave(&pfdevfreq->lock, irqflags);
panfrost_devfreq_update_utilization(pfdevfreq);
pfdevfreq->current_frequency = status->current_frequency;
status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
pfdevfreq->idle_time));
@ -164,6 +169,14 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
panfrost_devfreq_profile.initial_freq = cur_freq;
/*
* We could wait until panfrost_devfreq_target() to set this value, but
* since the simple_ondemand governor works asynchronously, there's a
* chance by the time someone opens the device's fdinfo file, current
* frequency hasn't been updated yet, so let's just do an early set.
*/
pfdevfreq->current_frequency = cur_freq;
/*
* Set the recommend OPP this will enable and configure the regulator
* if any and will avoid a switch off by regulator_late_cleanup()