linux.git/drivers/base/power/opp.c, branch v3.8

PM / OPP: using kfree_rcu() to simplify the code

2012-11-14T23:36:10+00:00

The callback function of call_rcu() just calls a kfree(), so we
can use kfree_rcu() instead of call_rcu() + callback function.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun 
Signed-off-by: Rafael J. Wysocki

PM / OPP: predictable fail results for opp_find* functions, v2

2012-11-14T23:36:10+00:00

Currently the opp_find* functions return -ENODEV when:
a) it cant find a device (e.g. request for an OPP search on device
   which was not registered)
b) When it cant find a match for the search strategy used

This makes life a little in-efficient for users such as devfreq
to make reasonable judgement before switching search strategies.

So, standardize the return results as following:
 -EINVAL for bad pointer parameters
 -ENODEV when device cannot be found
 -ERANGE when search fails

This has the following benefit for devfreq implementation:
The search fails when an unregistered device pointer is provided.
This is a trigger to change the search direction and search for
a better fit, however, if we cannot differentiate between a valid
search range failure Vs an unregistered device, second search goes
through the same fail return condition. This can be avoided by
appropriate handling of error return code.

With this change, we also fix devfreq for the improved search
strategy with updated error code.

Signed-off-by: Nishanth Menon 
Reviewed-by: Kevin Hilman 
Acked-by: MyungJoo Ham 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Export symbols for module usage.

2012-11-14T23:36:10+00:00

Export the OPP functions for use by driver modules.

Cc: "Rafael J. Wysocki" 
Cc: Kevin Hilman 
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

[nm@ti.com: expansion of functions exported]
Signed-off-by: Nishanth Menon 
Signed-off-by: Liam Girdwood 
Acked-by: Kevin Hilman 
Signed-off-by: Rafael J. Wysocki

PM / OPP: RCU reclaim

2012-11-14T23:36:09+00:00

synchronize_rcu() blocks the caller of opp_enable/disbale
for a complete grace period. This blocking duration prevents
any intensive use of the functions. Replace synchronize_rcu()
by call_rcu() which will call our function for freeing the old
opp element.

The duration of opp_enable() and opp_disable() will be no more
dependant of the grace period.

Signed-off-by: Vincent Guittot 
Reviewed-by: Paul E. McKenney 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Initialize OPP table from device tree

2012-09-09T20:06:33+00:00

With a lot of devices booting from device tree nowadays, it requires
that OPP table can be initialized from device tree.  The patch adds
a helper function of_init_opp_table together with a binding doc for
that purpose.

Signed-off-by: Shawn Guo 
Acked-by: Rob Herring 
Signed-off-by: Rafael J. Wysocki

device.h: cleanup users outside of linux/include (C files)

2012-03-11T18:27:37+00:00

For files that are actively using linux/device.h, make sure
that they call it out.  This will allow us to clean up some
of the implicit uses of linux/device.h within include/*
without introducing build regressions.

Yes, this was created by "cheating" -- i.e. the headers were
cleaned up, and then the fallout was found and fixed, and then
the two commits were reordered.  This ensures we don't introduce
build regressions into the git history.

Signed-off-by: Paul Gortmaker

PM / OPP: Use ERR_CAST instead of ERR_PTR(PTR_ERR())

2011-11-08T21:34:00+00:00

Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...))

[The semantic patch that makes this change is available
 in scripts/coccinelle/api/err_cast.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/]

Signed-off-by: Thomas Meyer 
Signed-off-by: Rafael J. Wysocki

PM / OPP: Add OPP availability change notifier.

2011-09-30T20:35:12+00:00

The patch enables to register notifier_block for an OPP-device in order
to get notified for any changes in the availability of OPPs of the
device. For example, if a new OPP is inserted or enable/disable status
of an OPP is changed, the notifier is executed.

This enables the usage of opp_add, opp_enable, and opp_disable to
directly take effect with any connected entities such as cpufreq or
devfreq.

Signed-off-by: MyungJoo Ham 
Signed-off-by: Kyungmin Park 
Reviewed-by: Mike Turquette 
Reviewed-by: Kevin Hilman 
Signed-off-by: Rafael J. Wysocki

drivers/base/power/opp.c: fix dev_opp initial value

2011-07-26T23:49:41+00:00

Dev_opp initial value shoule be ERR_PTR(), IS_ERR() is used to check
error.

Signed-off-by: Jonghwan Choi 
Cc: "Rafael J. Wysocki" 
Cc: Greg KH 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

PM / OPP: Introduce function to free cpufreq table

2011-07-15T21:58:18+00:00

cpufreq table allocated by opp_init_cpufreq_table is better
freed by OPP layer itself. This allows future modifications to
the table handling to be transparent to the users.

Signed-off-by: Nishanth Menon 
Acked-by: Kevin Hilman 
Signed-off-by: Rafael J. Wysocki