From 05d7ae15cfb18f9ce55eef85bb6bcd62d31acc57 Mon Sep 17 00:00:00 2001
From: Leonard Crestez <leonard.crestez@nxp.com>
Date: Thu, 5 Dec 2019 12:05:06 +0200
Subject: PM / devfreq: Add PM QoS support
Register notifiers with the PM QoS framework in order to respond to
requests for DEV_PM_QOS_MIN_FREQUENCY and DEV_PM_QOS_MAX_FREQUENCY.
No notifiers are added by this patch but PM QoS constraints can be
imposed externally (for example from other devices).
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
include/linux/devfreq.h | 5 +++++
1 file changed, 5 insertions(+)
(limited to 'include/linux/devfreq.h')
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 2bae9ed3c783..8b92ccbd1962 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -136,6 +136,8 @@ struct devfreq_dev_profile {
* @time_in_state: Statistics of devfreq states
* @last_stat_updated: The last time stat updated
* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
+ * @nb_min: Notifier block for DEV_PM_QOS_MIN_FREQUENCY
+ * @nb_max: Notifier block for DEV_PM_QOS_MAX_FREQUENCY
*
* This structure stores the devfreq information for a give device.
*
@@ -178,6 +180,9 @@ struct devfreq {
unsigned long last_stat_updated;
struct srcu_notifier_head transition_notifier_list;
+
+ struct notifier_block nb_min;
+ struct notifier_block nb_max;
};
struct devfreq_freqs {
--
cgit
From 27dbc542f651ed09de910f274b32634904103774 Mon Sep 17 00:00:00 2001
From: Leonard Crestez <leonard.crestez@nxp.com>
Date: Thu, 5 Dec 2019 12:05:07 +0200
Subject: PM / devfreq: Use PM QoS for sysfs min/max_freq
Switch the handling of min_freq and max_freq from sysfs to use the
dev_pm_qos_request interface.
Since PM QoS handles frequencies as kHz this change reduces the
precision of min_freq and max_freq. This shouldn't introduce problems
because frequencies which are not an integer number of kHz are likely
not an integer number of Hz either.
Try to ensure compatibility by rounding min values down and rounding
max values up.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
[cw00.choi: Return -EAGAIN instead of -EINVAL if dev_pm_qos is inactive]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
include/linux/devfreq.h | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
(limited to 'include/linux/devfreq.h')
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 8b92ccbd1962..fb376b5b7281 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/pm_opp.h>
+#include <linux/pm_qos.h>
#define DEVFREQ_NAME_LEN 16
@@ -123,8 +124,8 @@ struct devfreq_dev_profile {
* @previous_freq: previously configured frequency value.
* @data: Private data of the governor. The devfreq framework does not
* touch this.
- * @min_freq: Limit minimum frequency requested by user (0: none)
- * @max_freq: Limit maximum frequency requested by user (0: none)
+ * @user_min_freq_req: PM QoS minimum frequency request from user (via sysfs)
+ * @user_max_freq_req: PM QoS maximum frequency request from user (via sysfs)
* @scaling_min_freq: Limit minimum frequency requested by OPP interface
* @scaling_max_freq: Limit maximum frequency requested by OPP interface
* @stop_polling: devfreq polling status of a device.
@@ -163,8 +164,8 @@ struct devfreq {
void *data; /* private data for governors */
- unsigned long min_freq;
- unsigned long max_freq;
+ struct dev_pm_qos_request user_min_freq_req;
+ struct dev_pm_qos_request user_max_freq_req;
unsigned long scaling_min_freq;
unsigned long scaling_max_freq;
bool stop_polling;
--
cgit