From: Lukasz Luba <l.luba@partner.samsung.com>
To: linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org
Cc: tjakobi@math.uni-bielefeld.de, myungjoo.ham@samsung.com,
kyungmin.park@samsung.com, cw00.choi@samsung.com,
rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz,
gregkh@linuxfoundation.org, keescook@chromium.org,
anton@enomsg.org, ccross@android.com, tony.luck@intel.com,
robh+dt@kernel.org, mark.rutland@arm.com, kgene@kernel.org,
krzk@kernel.org, m.szyprowski@samsung.com,
b.zolnierkie@samsung.com,
Lukasz Luba <l.luba@partner.samsung.com>
Subject: [PATCH v3 3/5] devfreq: add devfreq_suspend/resume() functions
Date: Wed, 5 Dec 2018 12:05:54 +0100 [thread overview]
Message-ID: <1544007956-28889-4-git-send-email-l.luba@partner.samsung.com> (raw)
In-Reply-To: <1544007956-28889-1-git-send-email-l.luba@partner.samsung.com>
This patch adds implementation for global suspend/resume for
devfreq framework. System suspend will next use these functions.
Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/devfreq.h | 6 ++++++
2 files changed, 50 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 46517b6..0ae3de7 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -935,6 +935,50 @@ int devfreq_resume_device(struct devfreq *devfreq)
EXPORT_SYMBOL(devfreq_resume_device);
/**
+ * devfreq_suspend() - Suspend devfreq governors and devices
+ *
+ * Called during system wide Suspend/Hibernate cycles for suspending governors
+ * and devices preserving the state for resume. On some platforms the devfreq
+ * device must have precise state (frequency) after resume in order to provide
+ * fully operating setup.
+ */
+void devfreq_suspend(void)
+{
+ struct devfreq *devfreq;
+ int ret;
+
+ mutex_lock(&devfreq_list_lock);
+ list_for_each_entry(devfreq, &devfreq_list, node) {
+ ret = devfreq_suspend_device(devfreq);
+ if (ret)
+ dev_err(&devfreq->dev,
+ "failed to suspend devfreq device\n");
+ }
+ mutex_unlock(&devfreq_list_lock);
+}
+
+/**
+ * devfreq_resume() - Resume devfreq governors and devices
+ *
+ * Called during system wide Suspend/Hibernate cycle for resuming governors and
+ * devices that are suspended with devfreq_suspend().
+ */
+void devfreq_resume(void)
+{
+ struct devfreq *devfreq;
+ int ret;
+
+ mutex_lock(&devfreq_list_lock);
+ list_for_each_entry(devfreq, &devfreq_list, node) {
+ ret = devfreq_resume_device(devfreq);
+ if (ret)
+ dev_warn(&devfreq->dev,
+ "failed to resume devfreq device\n");
+ }
+ mutex_unlock(&devfreq_list_lock);
+}
+
+/**
* devfreq_add_governor() - Add devfreq governor
* @governor: the devfreq governor to be added
*/
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index d985199..fbffa74 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev,
extern int devfreq_suspend_device(struct devfreq *devfreq);
extern int devfreq_resume_device(struct devfreq *devfreq);
+extern void devfreq_suspend(void);
+extern void devfreq_resume(void);
+
/**
* update_devfreq() - Reevaluate the device and configure frequency
* @devfreq: the devfreq device
@@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq)
return 0;
}
+static inline void devfreq_suspend(void) {}
+static inline void devfreq_resume(void) {}
+
static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags)
{
--
2.7.4
next prev parent reply other threads:[~2018-12-05 11:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20181205110616eucas1p1e0e17b0c6a96c3b6d77516d4b02de8b1@eucas1p1.samsung.com>
2018-12-05 11:05 ` [PATCH v3 0/5] devfreq: handle suspend/resume Lukasz Luba
[not found] ` <CGME20181205110619eucas1p2eb8553c60b4e23b07c76f02b3867827c@eucas1p2.samsung.com>
2018-12-05 11:05 ` [PATCH v3 1/5] devfreq: refactor set_target frequency function Lukasz Luba
[not found] ` <CGME20181205110620eucas1p14de70dc092580b684a0304b5ce771605@eucas1p1.samsung.com>
2018-12-05 11:05 ` [PATCH v3 2/5] devfreq: add support for suspend/resume of a devfreq device Lukasz Luba
2018-12-06 1:17 ` Chanwoo Choi
2018-12-06 10:13 ` Lukasz Luba
[not found] ` <CGME20181205110620eucas1p14de70dc092580b684a0304b5ce771605@epcms1p1>
2018-12-11 1:43 ` MyungJoo Ham
2018-12-11 8:26 ` Lukasz Luba
[not found] ` <CGME20181205110622eucas1p23d788afd54ad34c0a2663efac8734648@eucas1p2.samsung.com>
2018-12-05 11:05 ` Lukasz Luba [this message]
2018-12-06 1:30 ` [PATCH v3 3/5] devfreq: add devfreq_suspend/resume() functions Chanwoo Choi
[not found] ` <CGME20181205110622eucas1p23d788afd54ad34c0a2663efac8734648@epcms1p3>
2018-12-11 2:45 ` MyungJoo Ham
[not found] ` <CGME20181205110623eucas1p120f9d8b38822bf856a5b7d427d00e49f@eucas1p1.samsung.com>
2018-12-05 11:05 ` [PATCH v3 4/5] drivers: power: suspend: call devfreq suspend/resume Lukasz Luba
2018-12-13 14:35 ` Lukasz Luba
[not found] ` <CGME20181205110623eucas1p120f9d8b38822bf856a5b7d427d00e49f@epcms1p7>
2018-12-21 0:33 ` MyungJoo Ham
2019-01-02 15:08 ` Lukasz Luba
2019-01-03 10:08 ` Rafael J. Wysocki
[not found] ` <CGME20181205110625eucas1p10c7b3137fb77ae51a211c4f040c4eb6f@eucas1p1.samsung.com>
2018-12-05 11:05 ` [PATCH v3 5/5] arm: dts: exynos4: opp-suspend in DMC and leftbus Lukasz Luba
2018-12-05 11:12 ` Krzysztof Kozlowski
2018-12-05 11:45 ` Lukasz Luba
[not found] ` <CGME20181205110619eucas1p2eb8553c60b4e23b07c76f02b3867827c@epcms1p7>
2018-12-11 2:08 ` [PATCH v3 1/5] devfreq: refactor set_target frequency function MyungJoo Ham
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