[PATCH] opp: Remove bandwidth votes when target_freq is zero

From: Viresh Kumar
Date: Wed May 27 2020 - 00:07:48 EST


We already drop several votes when target_freq is set to zero, drop
bandwidth votes as well.

Reported-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
@Georgi/Sibi: Sibi requested this change, please test this out.

drivers/opp/core.c | 47 +++++++++++++++++++++++++++++++++++-----------
1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 56d3022c1ca2..0c259d5ed232 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -725,6 +725,34 @@ static int _generic_set_opp_regulator(struct opp_table *opp_table,
return ret;
}

+static int _set_opp_bw(const struct opp_table *opp_table,
+ struct dev_pm_opp *opp, bool remove)
+{
+ u32 avg, peak;
+ int i, ret;
+
+ if (!opp_table->paths)
+ return 0;
+
+ for (i = 0; i < opp_table->path_count; i++) {
+ if (remove) {
+ avg = 0;
+ peak = 0;
+ } else {
+ avg = opp->bandwidth[i].avg;
+ peak = opp->bandwidth[i].peak;
+ }
+ ret = icc_set_bw(opp_table->paths[i], avg, peak);
+ if (ret) {
+ dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
+ remove ? "remove" : "set", i, ret);
+ retrun ret;
+ }
+ }
+
+ return 0;
+}
+
static int _set_opp_custom(const struct opp_table *opp_table,
struct device *dev, unsigned long old_freq,
unsigned long freq,
@@ -837,12 +865,17 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (!_get_opp_count(opp_table))
return 0;

- if (!opp_table->required_opp_tables && !opp_table->regulators) {
+ if (!opp_table->required_opp_tables && !opp_table->regulators &&
+ !opp_table->paths) {
dev_err(dev, "target frequency can't be 0\n");
ret = -EINVAL;
goto put_opp_table;
}

+ ret = _set_opp_bw(opp_table, opp, true);
+ if (ret)
+ return ret;
+
if (opp_table->regulator_enabled) {
regulator_disable(opp_table->regulators[0]);
opp_table->regulator_enabled = false;
@@ -932,16 +965,8 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
dev_err(dev, "Failed to set required opps: %d\n", ret);
}

- if (!ret && opp_table->paths) {
- for (i = 0; i < opp_table->path_count; i++) {
- ret = icc_set_bw(opp_table->paths[i],
- opp->bandwidth[i].avg,
- opp->bandwidth[i].peak);
- if (ret)
- dev_err(dev, "Failed to set bandwidth[%d]: %d\n",
- i, ret);
- }
- }
+ if (!ret)
+ ret = _set_opp_bw(opp_table, opp, false);

put_opp:
dev_pm_opp_put(opp);
--
2.25.0.rc1.19.g042ed3e048af