There is one case where we may end up with no "supply" directory for the
OPPs in debugfs. That happens when the OPP core isn't managing the
regulators for the device and the device's OPP do have microvolt
property. It happens because the opp_table->regulator_count remains set
to 0 and the debugfs routines don't add any supply directory in such a
case.
This commit fixes that by setting opp_table->regulator_count to 1 in
that particular case. But to make everything work nicely and not break
other parts of the core, regulator_count is defined as "int" now instead
of "unsigned int" and it can have different special values now. It is
set to -1 initially to mark it "uninitialized" and later only we set it
to 0 or positive values after checking how many supplies are there.
This also helps in finding the bugs where only few of the OPPs have the
"opp-microvolt" property set and not all.
Fixes:
1fae788ed640 ("PM / OPP: Don't create debugfs "supply-0" directory unnecessarily")
Reported-by: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
mutex_init(&opp_table->lock);
INIT_LIST_HEAD(&opp_table->dev_list);
+ /* Mark regulator count uninitialized */
+ opp_table->regulator_count = -1;
+
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
kfree(opp_table);
int count, supply_size;
/* Allocate space for at least one supply */
- count = table->regulator_count ? table->regulator_count : 1;
+ count = table->regulator_count > 0 ? table->regulator_count : 1;
supply_size = sizeof(*opp->supplies) * count;
/* allocate new OPP node and supplies structures */
kfree(opp_table->regulators);
opp_table->regulators = NULL;
- opp_table->regulator_count = 0;
+ opp_table->regulator_count = -1;
err:
dev_pm_opp_put_opp_table(opp_table);
kfree(opp_table->regulators);
opp_table->regulators = NULL;
- opp_table->regulator_count = 0;
+ opp_table->regulator_count = -1;
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
if (!opp_table)
return -ENOMEM;
+ /* Fix regulator count for dynamic OPPs */
+ opp_table->regulator_count = 1;
+
ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
if (ret)
dev_pm_opp_put_opp_table(opp_table);
struct opp_table *opp_table)
{
u32 *microvolt, *microamp = NULL;
- int supplies, vcount, icount, ret, i, j;
+ int supplies = opp_table->regulator_count, vcount, icount, ret, i, j;
struct property *prop = NULL;
char name[NAME_MAX];
- supplies = opp_table->regulator_count ? opp_table->regulator_count : 1;
-
/* Search for "opp-microvolt-<name>" */
if (opp_table->prop_name) {
snprintf(name, sizeof(name), "opp-microvolt-%s",
/* Missing property isn't a problem, but an invalid entry is */
if (!prop) {
- if (!opp_table->regulator_count)
+ if (unlikely(supplies == -1)) {
+ /* Initialize regulator_count */
+ opp_table->regulator_count = 0;
+ return 0;
+ }
+
+ if (!supplies)
return 0;
dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
}
}
+ if (unlikely(supplies == -1)) {
+ /* Initialize regulator_count */
+ supplies = opp_table->regulator_count = 1;
+ } else if (unlikely(!supplies)) {
+ dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__);
+ return -EINVAL;
+ }
+
vcount = of_property_count_u32_elems(opp->np, name);
if (vcount < 0) {
dev_err(dev, "%s: Invalid %s property (%d)\n",
* @prop_name: A name to postfix to many DT properties, while parsing them.
* @clk: Device's clock handle
* @regulators: Supply regulators
- * @regulator_count: Number of power supply regulators
+ * @regulator_count: Number of power supply regulators. Its value can be -1
+ * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
+ * property).
* @genpd_performance_state: Device's power domain support performance state.
* @set_opp: Platform specific set_opp callback
* @set_opp_data: Data to be passed to set_opp callback
const char *prop_name;
struct clk *clk;
struct regulator **regulators;
- unsigned int regulator_count;
+ int regulator_count;
bool genpd_performance_state;
int (*set_opp)(struct dev_pm_set_opp_data *data);