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authorRajendra Nayak <rnayak@codeaurora.org>2019-03-20 15:19:09 +0530
committerViresh Kumar <viresh.kumar@linaro.org>2019-06-17 09:51:31 +0530
commitcd7ea582866f43324f3d60f0d4daac05e08f0f41 (patch)
tree94e61b00cd519eb374ddc84c62daef7fbdef6738 /drivers/opp
parentb3e3759ee4abd72bedbf4b109ff1749d3aea6f21 (diff)
downloadlinux-cd7ea582866f43324f3d60f0d4daac05e08f0f41.tar.bz2
opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes
For devices with performance state, we use dev_pm_opp_set_rate() to set the appropriate clk rate and the performance state. We do need a way to remove the performance state vote when we idle the device and turn the clocks off. Use dev_pm_opp_set_rate() with freq = 0 to achieve this. Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> [ Viresh: Updated _set_required_opps() to handle the !opp case ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index bae94bfa1e96..9fda9a0ec016 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -711,7 +711,7 @@ static int _set_required_opps(struct device *dev,
/* Single genpd case */
if (!genpd_virt_devs) {
- pstate = opp->required_opps[0]->pstate;
+ pstate = likely(opp) ? opp->required_opps[0]->pstate : 0;
ret = dev_pm_genpd_set_performance_state(dev, pstate);
if (ret) {
dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",
@@ -729,7 +729,7 @@ static int _set_required_opps(struct device *dev,
mutex_lock(&opp_table->genpd_virt_dev_lock);
for (i = 0; i < opp_table->required_opp_count; i++) {
- pstate = opp->required_opps[i]->pstate;
+ pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
if (!genpd_virt_devs[i])
continue;
@@ -765,18 +765,23 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
struct clk *clk;
int ret;
- if (unlikely(!target_freq)) {
- dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
- target_freq);
- return -EINVAL;
- }
-
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__);
return PTR_ERR(opp_table);
}
+ if (unlikely(!target_freq)) {
+ if (opp_table->required_opp_tables) {
+ ret = _set_required_opps(dev, opp_table, NULL);
+ } else {
+ dev_err(dev, "target frequency can't be 0\n");
+ ret = -EINVAL;
+ }
+
+ goto put_opp_table;
+ }
+
clk = opp_table->clk;
if (IS_ERR(clk)) {
dev_err(dev, "%s: No clock available for the device\n",