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authorViresh Kumar <viresh.kumar@linaro.org>2023-11-16 15:59:35 +0530
committerViresh Kumar <viresh.kumar@linaro.org>2023-11-28 16:03:25 +0530
commit925141432fa4d8325b7156e88e53d740b12d0b0e (patch)
tree16c7c6d5262f018ab15819f5f215fd3aef9867e5 /drivers/opp
parente37440e7e2c2760475d60c5556b59c8880a7fd63 (diff)
downloadlwn-925141432fa4d8325b7156e88e53d740b12d0b0e.tar.gz
lwn-925141432fa4d8325b7156e88e53d740b12d0b0e.zip
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 <ulf.hansson@linaro.org> Tested-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c16
-rw-r--r--drivers/opp/of.c7
2 files changed, 20 insertions, 3 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e08375ed50aa..4f1ca84d9ed0 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 5a7e294e56b7..f9f0b22bccbb 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;