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 <[email protected]> Reviewed-by: AngeloGioacchino Del Regno <[email protected]> Signed-off-by: Nicolas Frattaroli <[email protected]> --- drivers/gpu/drm/panthor/panthor_devfreq.c | 32 ++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c index a6dca599f0a5..ec63e27f4883 100644 --- a/drivers/gpu/drm/panthor/panthor_devfreq.c +++ b/drivers/gpu/drm/panthor/panthor_devfreq.c @@ -141,6 +141,7 @@ 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; @@ -152,17 +153,30 @@ 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; + } else { + dev_pm_opp_put_opp_table(table); } - ret = devm_pm_opp_of_add_table(dev); - if (ret) - return ret; - spin_lock_init(&pdevfreq->lock); panthor_devfreq_reset(pdevfreq); -- 2.51.0
