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authorSaravana Kannan <saravanak@google.com>2021-02-04 09:14:22 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2021-02-04 12:00:14 +0100
commit7d8658ef65a4f891d0cff6340fa717b378384642 (patch)
tree6d6d69f3d586c044b91d3eb2615ee6c0db7d183e /drivers/opp
parentopp: Replace ENOTSUPP with EOPNOTSUPP (diff)
downloadlinux-7d8658ef65a4f891d0cff6340fa717b378384642.tar.xz
linux-7d8658ef65a4f891d0cff6340fa717b378384642.zip
OPP: Add function to look up required OPP's for a given OPP
Add a function that allows looking up required OPPs given a source OPP table, destination OPP table and the source OPP. Signed-off-by: Saravana Kannan <saravanak@google.com> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> [ Viresh: Rearranged code, fixed return errors ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index dc95d29e94c1..c3f3d9249cc5 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2399,6 +2399,61 @@ devm_pm_opp_attach_genpd(struct device *dev, const char **names,
EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
/**
+ * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
+ * @src_table: OPP table which has @dst_table as one of its required OPP table.
+ * @dst_table: Required OPP table of the @src_table.
+ * @src_opp: OPP from the @src_table.
+ *
+ * This function returns the OPP (present in @dst_table) pointed out by the
+ * "required-opps" property of the @src_opp (present in @src_table).
+ *
+ * The callers are required to call dev_pm_opp_put() for the returned OPP after
+ * use.
+ *
+ * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise.
+ */
+struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
+ struct opp_table *dst_table,
+ struct dev_pm_opp *src_opp)
+{
+ struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV);
+ int i;
+
+ if (!src_table || !dst_table || !src_opp ||
+ !src_table->required_opp_tables)
+ return ERR_PTR(-EINVAL);
+
+ /* required-opps not fully initialized yet */
+ if (lazy_linking_pending(src_table))
+ return ERR_PTR(-EBUSY);
+
+ for (i = 0; i < src_table->required_opp_count; i++) {
+ if (src_table->required_opp_tables[i] == dst_table) {
+ mutex_lock(&src_table->lock);
+
+ list_for_each_entry(opp, &src_table->opp_list, node) {
+ if (opp == src_opp) {
+ dest_opp = opp->required_opps[i];
+ dev_pm_opp_get(dest_opp);
+ break;
+ }
+ }
+
+ mutex_unlock(&src_table->lock);
+ break;
+ }
+ }
+
+ if (IS_ERR(dest_opp)) {
+ pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__,
+ src_table, dst_table);
+ }
+
+ return dest_opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp);
+
+/**
* dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
* @src_table: OPP table which has dst_table as one of its required OPP table.
* @dst_table: Required OPP table of the src_table.