diff options
Diffstat (limited to 'drivers/opp/of.c')
-rw-r--r-- | drivers/opp/of.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 85fad7ca0007..4cdeeab5ceee 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -296,7 +296,7 @@ void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp) of_node_put(opp->np); } -static int _link_required_opps(struct dev_pm_opp *opp, +static int _link_required_opps(struct dev_pm_opp *opp, struct opp_table *opp_table, struct opp_table *required_table, int index) { struct device_node *np; @@ -314,6 +314,31 @@ static int _link_required_opps(struct dev_pm_opp *opp, return -ENODEV; } + /* + * There are two genpd (as required-opp) cases that we need to handle, + * devices with a single genpd and ones with multiple genpds. + * + * The single genpd case requires special handling as we need to use the + * same `dev` structure (instead of a virtual one provided by genpd + * core) for setting the performance state. + * + * It doesn't make sense for a device's DT entry to have both + * "opp-level" and single "required-opps" entry pointing to a genpd's + * OPP, as that would make the OPP core call + * dev_pm_domain_set_performance_state() for two different values for + * the same device structure. Lets treat single genpd configuration as a + * case where the OPP's level is directly available without required-opp + * link in the DT. + * + * Just update the `level` with the right value, which + * dev_pm_opp_set_opp() will take care of in the normal path itself. + */ + if (required_table->is_genpd && opp_table->required_opp_count == 1 && + !opp_table->genpd_virt_devs) { + if (!WARN_ON(opp->level != OPP_LEVEL_UNSET)) + opp->level = opp->required_opps[0]->level; + } + return 0; } @@ -338,7 +363,7 @@ static int _of_opp_alloc_required_opps(struct opp_table *opp_table, if (IS_ERR_OR_NULL(required_table)) continue; - ret = _link_required_opps(opp, required_table, i); + ret = _link_required_opps(opp, opp_table, required_table, i); if (ret) goto free_required_opps; } @@ -359,7 +384,7 @@ static int lazy_link_required_opps(struct opp_table *opp_table, int ret; list_for_each_entry(opp, &opp_table->opp_list, node) { - ret = _link_required_opps(opp, new_table, index); + ret = _link_required_opps(opp, opp_table, new_table, index); if (ret) return ret; } |