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>

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.