From: Hsin-Yi Wang <hsinyi@chromium.org>
To: Viresh Kumar <vireshk@kernel.org>, linux-pm@vger.kernel.org
Cc: Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@kernel.org>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
linux-kernel@vger.kernel.org,
"MyungJoo Ham )" <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Saravana Kannan <saravanak@google.com>
Subject: [PATCH v5 2/3] PM / devfreq: Cache OPP table reference in devfreq
Date: Wed, 3 Feb 2021 17:23:59 +0800 [thread overview]
Message-ID: <20210203092400.1791884-3-hsinyi@chromium.org> (raw)
In-Reply-To: <20210203092400.1791884-1-hsinyi@chromium.org>
From: Saravana Kannan <saravanak@google.com>
The OPP table can be used often in devfreq. Trying to get it each time can
be expensive, so cache it in the devfreq struct.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
drivers/devfreq/devfreq.c | 6 ++++++
include/linux/devfreq.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 6aa10de792b33..a5899c9ae16fc 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -757,6 +757,8 @@ static void devfreq_dev_release(struct device *dev)
if (devfreq->profile->exit)
devfreq->profile->exit(devfreq->dev.parent);
+ if (devfreq->opp_table)
+ dev_pm_opp_put_opp_table(devfreq->opp_table);
mutex_destroy(&devfreq->lock);
kfree(devfreq);
}
@@ -844,6 +846,10 @@ struct devfreq *devfreq_add_device(struct device *dev,
}
devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
+ devfreq->opp_table = dev_pm_opp_get_opp_table(dev);
+ if (IS_ERR(devfreq->opp_table))
+ devfreq->opp_table = NULL;
+
atomic_set(&devfreq->suspend_count, 0);
dev_set_name(&devfreq->dev, "%s", dev_name(dev));
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index b6d3bae1c74d8..26ea0850be9bb 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -137,6 +137,7 @@ struct devfreq_stats {
* using devfreq.
* @profile: device-specific devfreq profile
* @governor: method how to choose frequency based on the usage.
+ * @opp_table: Reference to OPP table of dev.parent, if one exists.
* @nb: notifier block used to notify devfreq object that it should
* reevaluate operable frequencies. Devfreq users may use
* devfreq.nb to the corresponding register notifier call chain.
@@ -173,6 +174,7 @@ struct devfreq {
struct device dev;
struct devfreq_dev_profile *profile;
const struct devfreq_governor *governor;
+ struct opp_table *opp_table;
struct notifier_block nb;
struct delayed_work work;
--
2.30.0.365.g02bc693789-goog
next prev parent reply other threads:[~2021-02-03 9:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210203092602epcas1p1550c96a2ed1b0b6d0a0f9f750cb76e45@epcas1p1.samsung.com>
2021-02-03 9:23 ` [PATCH v5 0/3] Add required-opps support to devfreq passive gov Hsin-Yi Wang
2021-02-03 9:23 ` [PATCH v5 1/3] OPP: Add function to look up required OPP's for a given OPP Hsin-Yi Wang
2021-02-04 5:46 ` Viresh Kumar
2021-02-03 9:23 ` Hsin-Yi Wang [this message]
2021-02-03 9:24 ` [PATCH v5 3/3] PM / devfreq: Add required OPPs support to passive governor Hsin-Yi Wang
2021-02-04 2:49 ` Viresh Kumar
2021-02-04 7:07 ` Hsin-Yi Wang
2021-02-03 10:12 ` [PATCH v5 0/3] Add required-opps support to devfreq passive gov Chanwoo Choi
2021-02-04 5:41 ` Viresh Kumar
2021-02-04 8:12 ` Hsin-Yi Wang
2021-02-04 8:53 ` Chanwoo Choi
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