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drm/panthor: Use existing OPP table if present

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On SoCs where the GPU's power-domain is in charge of setting performance
levels, the OPP table of the GPU node will have already been populated
during said power-domain's attach_dev operation.

To avoid initialising an OPP table twice, only set the OPP regulator and
the OPPs from DT if there's no OPP table present.

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://patch.msgid.link/20251017-mt8196-gpufreq-v8-4-98fc1cc566a1@collabora.com
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
This commit is contained in:
Nicolas Frattaroli
2025-10-17 17:31:11 +02:00
committed by Liviu Dudau
parent 3dd4844ba0
commit 3668133e11
1 changed files with 23 additions and 9 deletions
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32
drivers/gpu/drm/panthor/panthor_devfreq.c
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@@ -142,6 +142,7 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
struct thermal_cooling_device *cooling;
struct device *dev = ptdev->base.dev;
struct panthor_devfreq *pdevfreq;
struct opp_table *table;
struct dev_pm_opp *opp;
unsigned long cur_freq;
unsigned long freq = ULONG_MAX;
@@ -153,16 +154,29 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
ptdev->devfreq = pdevfreq;
ret = devm_pm_opp_set_regulators(dev, reg_names);
if (ret && ret != -ENODEV) {
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
return ret;
}
/*
* The power domain associated with the GPU may have already added an
* OPP table, complete with OPPs, as part of the platform bus
* initialization. If this is the case, the power domain is in charge of
* also controlling the performance, with a set_performance callback.
* Only add a new OPP table from DT if there isn't such a table present
* already.
*/
table = dev_pm_opp_get_opp_table(dev);
if (IS_ERR_OR_NULL(table)) {
ret = devm_pm_opp_set_regulators(dev, reg_names);
if (ret && ret != -ENODEV) {
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
return ret;
}
ret = devm_pm_opp_of_add_table(dev);
if (ret)
return ret;
ret = devm_pm_opp_of_add_table(dev);
if (ret)
return ret;
} else {
dev_pm_opp_put_opp_table(table);
}
spin_lock_init(&pdevfreq->lock);