From 925141432fa4d8325b7156e88e53d740b12d0b0e Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 16 Nov 2023 15:59:35 +0530 Subject: [PATCH] OPP: Don't set OPP recursively for a parent genpd Like other frameworks (clk, regulator, etc.) genpd core too takes care of propagation to performance state to parent genpds. The OPP core shouldn't attempt the same, or it may result in undefined behavior. Add checks at various places to take care of the same. Reviewed-by: Ulf Hansson Tested-by: Stephan Gerhold Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 16 +++++++++++++++- drivers/opp/of.c | 7 +++++-- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index e08375ed50aa7..4f1ca84d9ed03 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2392,6 +2392,12 @@ static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev, return -EINVAL; } + /* Genpd core takes care of propagation to parent genpd */ + if (opp_table->is_genpd) { + dev_err(dev, "%s: Operation not supported for genpds\n", __func__); + return -EOPNOTSUPP; + } + /* Checking only the first one is enough ? */ if (opp_table->required_devs[0]) return 0; @@ -2453,8 +2459,16 @@ static int _opp_set_required_devs(struct opp_table *opp_table, if (opp_table->required_devs[0]) return 0; - for (i = 0; i < opp_table->required_opp_count; i++) + for (i = 0; i < opp_table->required_opp_count; i++) { + /* Genpd core takes care of propagation to parent genpd */ + if (required_devs[i] && opp_table->is_genpd && + opp_table->required_opp_tables[i]->is_genpd) { + dev_err(dev, "%s: Operation not supported for genpds\n", __func__); + return -EOPNOTSUPP; + } + opp_table->required_devs[i] = required_devs[i]; + } return 0; } diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 5a7e294e56b70..f9f0b22bccbb4 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -339,8 +339,11 @@ static int _link_required_opps(struct dev_pm_opp *opp, struct opp_table *opp_tab */ if (required_table->is_genpd && opp_table->required_opp_count == 1 && !opp_table->required_devs[0]) { - if (!WARN_ON(opp->level != OPP_LEVEL_UNSET)) - opp->level = opp->required_opps[0]->level; + /* Genpd core takes care of propagation to parent genpd */ + if (!opp_table->is_genpd) { + if (!WARN_ON(opp->level != OPP_LEVEL_UNSET)) + opp->level = opp->required_opps[0]->level; + } } return 0; -- 2.30.2