linux.git/drivers/devfreq, branch v4.7-rc2

PM / devfreq: style/typo fixes

2016-05-03T02:22:10+00:00

- Typo in comments fixed
- Unnecessary return statement removed

Signed-off-by: MyungJoo Ham

PM / devfreq: event: Find the instance of devfreq-event device by using phandle

2016-05-03T02:21:51+00:00

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 
Acked-by: MyungJoo Ham

PM / devfreq: event: Add new Exynos NoC probe driver

2016-05-03T02:21:07+00:00

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 
Tested-by: Markus Reichl 
Tested-by: Anand Moon 
Reviewed-by: Krzysztof Kozlowski

PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver

2016-05-03T02:20:09+00:00

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 
Signed-off-by: MyungJoo Ham 
Acked-by: Krzysztof Kozlowski

PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor

2016-05-03T02:20:08+00:00

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 
[tjakobi: Reported debugfs error during booting and cw00.choi fix it.]
Reported-by: Tobias Jakobi 
Signed-off-by: MyungJoo Ham 
Acked-by: Krzysztof Kozlowski

PM / devfreq: Add new passive governor

2016-05-03T02:20:07+00:00

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 
Signed-off-by: Chanwoo Choi 
[tjakobi: Reported RCU locking issue and cw00.choi fix it]
Reported-by: Tobias Jakobi 
[linux.amoon: Reported possible recursive locking and cw00.choi fix it]
Reported-by: Anand Moon 
Signed-off-by: MyungJoo Ham 
Acked-by: Krzysztof Kozlowski

PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier

2016-05-03T02:20:07+00:00

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 
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl 
Tested-by: Anand Moon 
Signed-off-by: MyungJoo Ham 
Acked-by: Krzysztof Kozlowski

PM / devfreq: Add devfreq_get_devfreq_by_phandle()

2016-05-03T02:20:06+00:00

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 
Signed-off-by: MyungJoo Ham 
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl 
Tested-by: Anand Moon 
Acked-by: Krzysztof Kozlowski

PM / devfreq: exynos: Add generic exynos bus frequency driver

2016-05-03T02:20:05+00:00

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 
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl 
Tested-by: Anand Moon 
Signed-off-by: MyungJoo Ham 
Acked-by: Krzysztof Kozlowski

PM / devfreq: Spelling s/frequnecy/frequency/

2016-03-17T01:30:16+00:00

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Chanwoo Choi 
Signed-off-by: Rafael J. Wysocki