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authorJonathan Marek <jonathan@marek.ca>2021-02-16 23:10:29 +0300
committerViresh Kumar <viresh.kumar@linaro.org>2021-02-18 10:01:08 +0300
commitde04241ab87afcaac26f15fcc32a7bd27294dd47 (patch)
tree2f3771a6619683890f71a1b24fdeb476b2b07450 /drivers/opp
parent86ad9a24f21ea7aac7deed06fe9556392568d88a (diff)
downloadlinux-de04241ab87afcaac26f15fcc32a7bd27294dd47.tar.xz
opp: Don't skip freq update for different frequency
We skip the OPP update if the current and target OPPs are same. This is fine for the devices that don't support frequency but may cause issues for the ones that need to program frequency. An OPP entry doesn't really signify a single operating frequency but rather the highest frequency at which the other properties of the OPP entry apply. And we may reach here with different frequency values, while all of them would point to the same OPP entry in the OPP table. We just need to update the clock frequency in that case, though in order to not add special exit points we reuse the code flow from a normal path. While at it, rearrange the conditionals in the 'if' statement to check 'enabled' flag at the end. Fixes: 81c4d8a3c414 ("opp: Keep track of currently programmed OPP") Signed-off-by: Jonathan Marek <jonathan@marek.ca> [ Viresh: Improved commit log and subject, rename current_freq as current_rate, document it, remove local variable and rearrange code. ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c8
-rw-r--r--drivers/opp/opp.h2
2 files changed, 7 insertions, 3 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index c3f3d9249cc5..c2689386a906 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -998,14 +998,15 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table,
old_opp = opp_table->current_opp;
/* Return early if nothing to do */
- if (opp_table->enabled && old_opp == opp) {
+ if (old_opp == opp && opp_table->current_rate == freq &&
+ opp_table->enabled) {
dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__);
return 0;
}
dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
- __func__, old_opp->rate, freq, old_opp->level, opp->level,
- old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
+ __func__, opp_table->current_rate, freq, old_opp->level,
+ opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
opp->bandwidth ? opp->bandwidth[0].peak : 0);
scaling_down = _opp_compare_key(old_opp, opp);
@@ -1061,6 +1062,7 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table,
/* Make sure current_opp doesn't get freed */
dev_pm_opp_get(opp);
opp_table->current_opp = opp;
+ opp_table->current_rate = freq;
return ret;
}
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 9b9daf83b074..50fb9dced3c5 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -135,6 +135,7 @@ enum opp_table_access {
* @clock_latency_ns_max: Max clock latency in nanoseconds.
* @parsed_static_opps: Count of devices for which OPPs are initialized from DT.
* @shared_opp: OPP is shared between multiple devices.
+ * @current_rate: Currently configured frequency.
* @current_opp: Currently configured OPP for the table.
* @suspend_opp: Pointer to OPP to be used during device suspend.
* @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers.
@@ -184,6 +185,7 @@ struct opp_table {
unsigned int parsed_static_opps;
enum opp_table_access shared_opp;
+ unsigned long current_rate;
struct dev_pm_opp *current_opp;
struct dev_pm_opp *suspend_opp;