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

[Viresh Kumar]

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

Reported-by: Sibi Sankar <si...@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
@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