of_node_put needs to be called when the device node which is got
from of_parse_phandle has finished using.
[Commit updated to fix an error by MyungJoo]
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
of_node_put needs to be called when the device node which is got
from of_parse_phandle has finished using.
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
iounmap() needs to be called in case of memory allocation
(for devfreq-event devices) failure. Fix it.
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
In case of exynos_bus_parse_of() failure the code shouldn't
try to remove the OPP table and disable+unprepare bus->clk
as it has been already handled in exynos_bus_parse_of().
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The Kconfig currently controlling compilation of this code is:
config DEVFREQ_EVENT_EXYNOS_PPMU
bool "EXYNOS PPMU (Platform Performance Monitoring Unit) DEVFREQ event Driver"
...meaning that it currently is not being built as a module by anyone.
Rather than rip out the existing modular code, Chanwoo indicated
that he'd rather see the driver offered as tristate.
I don't have the hardware for runtime validation, so this change
is only validated for compile and modpost.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The Kconfig currently controlling compilation of this code is:
event/Kconfig:config DEVFREQ_EVENT_EXYNOS_NOCP
event/Kconfig: bool "EXYNOS NoC (Network On Chip) Probe DEVFREQ event Driver"
...meaning that it currently is not being built as a module by anyone.
Rather than rip out the existing modular code, Chanwoo indicated
that he'd rather see the driver offered as tristate.
I don't have the hardware for runtime validation, so this change
is only validated for compile and modpost.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The Kconfig currently controlling compilation of this code is:
devfreq/Kconfig:config ARM_EXYNOS_BUS_DEVFREQ
devfreq/Kconfig: bool "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
...meaning that it currently is not being built as a module by anyone.
Rather than rip out the existing modular code, Chanwoo indicated
that he'd rather see the driver offered as tristate.
I don't have the hardware for runtime validation, so this change
is only validated for compile and modpost.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The Kconfig currently controlling compilation of this code is:
menuconfig PM_DEVFREQ_EVENT
bool "DEVFREQ-Event device Support"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
This code wasn't using module_init, so we don't need to be concerned
with altering the initcall level here.
We don't replace module.h with init.h since the file already has that.
But we do add export.h since this file does export some symbols.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The Kconfig currently controlling compilation of this code is:
menuconfig PM_DEVFREQ
bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
This code wasn't using module_init, so we don't need to be concerned
with altering the initcall level here.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
We don't replace module.h with init.h since the file already has that.
But we do add export.h since this file does export some symbols.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch sends the DEVFREQ_POSTCHANGE notification when
devfreq->profile->targer() is failed. The PRECHANGE/POSTCHANGE
should be paired.
Fixes: 0fe3a66410 (PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier)
Reported-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Some systems need current frequency from last_status for calculation
but it is zeroed during initialization. When the device starts there is
no history, but we can assume that the last frequency was the
same as the initial frequency (which is also used in 'previous_freq').
The log shows the result of this misinterpreted value.
[ 2.042847] ... Failed to get voltage for frequency 0: -34
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Smatch complains because platform_get_resource() returns NULL on error
and not an error pointer so the check is wrong. Julia Lawall pointed
out that normally we don't check these, because devm_ioremap_resource()
has a check for NULL.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
When device_register() returns with error, it has already
done put_device() on the input device pointer.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
devm_kzalloc of devfreq's statistics data structure has been
using its parent device as the dev allocated for.
If a device's devfreq is disabled in run-time,
such allocated memory won't be freed.
Desginating more precisely with the devfreq device
pointer fixes the issue.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch use the phandle to find the instance of devfreq-event device in
Device Tree when calling the devfreq_event_get_edev_by_phandle() because there
is two type devfreq-event devices as following:
First case, exynos-ppmu.c driver provides the maximum four event of each PPMU.
So, when getting the instance of devfreq-event device, using the unique name of
struct devfreq_event_desc.
Second case, exynos-nocp.c driver provide the only one event of each NoC Probe
device. So, when getting the instance of devfreq-event device, using the
phandle of each NoC probe device.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch adds NoC (Network on Chip) Probe driver which provides
the primitive values to get the performance data. The packets that the Network
on Chip (NoC) probes detects are transported over the network infrastructure.
Exynos542x bus has multiple NoC probes to provide bandwidth information about
behavior of the SoC that you can use while analyzing system performance.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch removes the unused exynos4/5 busfreq driver. Instead,
generic exynos-bus frequency driver support the all Exynos SoCs.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch adds the support of bus frequency feature for sub-blocks which share
the one power line. If each bus depends on the power line, each bus is not able
to change the voltage by oneself. To optimize the power-consumption on runtime,
some buses using the same power line should change the source clock and
regulator at the same time. So, this patch uses the passive governor to support
the bus frequency for all buses which sharing the one power line.
For example,
Exynos3250 include the two power line for AXI buses as following:
: VDD_MIF : MIF (Memory Interface) provide the DMC (Dynamic Memory Controller)
with the power (regulator).
: VDD_INT : INT (Internal) provide the various sub-blocks with the power
(regulator).
Each bus is included in as follwoing block. In the case of VDD_MIF, only DMC bus
use the power line. So, there is no any depencency between buese. But, in the
case of VDD_INT, various buses share the one power line of VDD_INT. We need to
make the depenency between buses. When using passive governor, there is no
problem to support the bus frequency as DVFS for all buses. One bus should be
operated as the parent bus device which gathering the current load of INT block
and then decides the new frequency with some governors except of passive
governor. After deciding the new frequency by the parent bus device, the rest
bus devices will change the each source clock according to new frequency of the
parent bus device.
- MIF (Memory Interface) block
: VDD_MIF |--- DMC
- INT (Internal) block
: VDD_INT |--- LEFTBUS (parent)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[tjakobi: Reported debugfs error during booting and cw00.choi fix it.]
Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch adds the new passive governor for DEVFREQ framework. The following
governors are already present and used for DVFS (Dynamic Voltage and Frequency
Scaling) drivers. The following governors are independently used for one device
driver which don't give the influence to other device drviers and also don't
receive the effect from other device drivers.
- ondemand / performance / powersave / userspace
The passive governor depends on operation of parent driver with specific
governos extremely and is not able to decide the new frequency by oneself.
According to the decided new frequency of parent driver with governor,
the passive governor uses it to decide the appropriate frequency for own
device driver. The passive governor must need the following information
from device tree:
- the source clock and OPP tables
- the instance of parent device
For exameple,
there are one more devfreq device drivers which need to change their source
clock according to their utilization on runtime. But, they share the same
power line (e.g., regulator). So, specific device driver is operated as parent
with ondemand governor and then the rest device driver with passive governor
is influenced by parent device.
Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[tjakobi: Reported RCU locking issue and cw00.choi fix it]
Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
[linux.amoon: Reported possible recursive locking and cw00.choi fix it]
Reported-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch adds the new DEVFREQ_TRANSITION_NOTIFIER notifier to send
the notification when the frequency of device is changed.
This notifier has two state as following:
- DEVFREQ_PRECHANGE : Notify it before chaning the frequency of device
- DEVFREQ_POSTCHANGE : Notify it after changed the frequency of device
And this patch adds the resourced-managed function to release the resource
automatically when error happen.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch adds the new devfreq_get_devfreq_by_phandle() OF helper function
which can find the instance of devfreq device by using phandle ("devfreq").
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This patch adds the generic exynos bus frequency driver for AMBA AXI bus
of sub-blocks in exynos SoC with DEVFREQ framework. The Samsung Exynos SoC
have the common architecture for bus between DRAM and sub-blocks in SoC.
This driver can support the generic bus frequency driver for Exynos SoCs.
In devicetree, Each bus block has a bus clock, regulator, operation-point
and devfreq-event devices which measure the utilization of each bus block.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
As per the documentation of the devfreq_dev_profile.target callback, set
the freq argument to the new frequency before returning.
This caused endless messages like this after recent changes in the core:
devfreq 6000c800.actmon: Couldn't update frequency transition information.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reported-by: Tyler Baker <tyler.baker@linaro.org>
Tested-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Before this patch for a device without statistics support,
$ cat trans_stat
From : To
: time(ms)
Total transitions : 0
$
After this patch applied for such a device,
$ cat trans_stat
Not Supported.
$
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch initialize the freq_table array of each devfreq device by using
the devfreq_set_freq_table(). If freq_table is NULL, the devfreq framework
is not able to support the frequency transtion information through sysfs.
The OPP core uses the integer type for the number of opps in the opp list
and uses the 'unsigned long' type for each frequency. So, this patch
modifies the type of some variable as following:
- the type of freq_table : unsigned int -> unsigned long
- the type of max_state : unsigned int -> int
- Corrected types, format strings, mutex usages by MyungJoo
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch adds the 'show_one' macro to simplify the duplicate code
of both max_freq_show() and min_freq_show().
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch just fixes following error and warning by using
scripts/checkpatch.pl.
- Follwoing issue from checkpatch.pl:
ERROR: space prohibited before that close parenthesis ')'
+ if (count < 0 ) {
WARNING: line over 80 characters
+ ptr = devres_alloc(devm_devfreq_event_release, sizeof(*ptr), GFP_KERNEL);
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch just removes the error log when
devfreq_event_get_edev_by_phandle() fail to get the instance of
devfreq-event device. It is related to sequence of the probe() of each
driver. So, this error log might show the always during kernel booting.
Each driver using this function can show the appropriate error log.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
When device_register() fails, kfree(devfreq) is called already in
devfreq_dev_release(), hence there is no need to call kfree(devfreq)
in err_dev again.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Writing the currently set governor into sysfs currently
seems to fail.
Fix this by setting the return code to zero before
leaving governor_store().
Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
time_in_state in struct devfreq is defined as unsigned long, so
devm_kzalloc should use sizeof(unsigned long) as argument instead
of sizeof(unsigned int), otherwise it will cause unexpected result
in 64bit system.
Signed-off-by: Xiaolong Ye <yexl@marvell.com>
Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The thermal infrastructure should use the devfreq cooling device, which
uses the OPP library to disable OPPs as necessary.
Fix a couple of typos in the same comment while we are at it.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
The return value of get_dev_status() can be reused. Cache it so that
other parts of the kernel can reuse it instead of having to call the
same function again.
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
IS_ERR(_OR_NULL) already contain an 'unlikely' compiler flag and there
is no need to do that again from its callers. Drop it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch adds the support for PPMU (Platform Performance Monitoring Unit)
version 2.0 for Exynos5433 SoC. Exynos5433 SoC must need PPMUv2 which is
quite different from PPMUv1.1. The exynos-ppmu.c driver supports both PPMUv1.1
and PPMUv2.
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
To avoid a race in which the interrupt will be handled before the
drvdata has been set up.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
As the DT bindings don't have an operating-points property any more,
build the OPP table from the frequencies supported by the EMC clock.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Now that we have per-user clocks and the possibility to set constraints
in a clock, set a floor constraint on the EMC clock.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
There seemed to be some miscommunication and an old version of the
submitted patches was merged.
This commit updates the driver to v5, which had this changelog:
* Clarify the units of avg_dependency_threshold
* Remove unused references to platform_device
* Enable and disable interrupts on governor events
* Make sure we handle all interrupts for any of the devices we are sampling
* Move locking to be per-actmon-device
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
CC: Alex Frid <afrid@nvidia.com>
CC: Mikko Perttunen <mikko.perttunen@kapsi.fi>
[Added const to device ID by MyungJoo]
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
_remove_devfreq() does not have @skip anymore after 3.16.
The comment for _remove_devfreq() has been updated correspondingly.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This patch adds the const keyword for devfreq_event_ops structure
because the ops of devfreq_event_desc structure should not be changed
after initialization.
Cc: Myungjoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Peter Chen