Commit Graph

69 Commits

Author SHA1 Message Date
Viresh Kumar 25419de1b8 PM / OPP: Fix shared OPP table support in dev_pm_opp_set_supported_hw()
It should be fine to call dev_pm_opp_set_supported_hw() for all possible
CPUs, even if some of them share the OPP table as the caller may not be
aware of sharing policy.

Lets increment the reference count of the OPP table and return its
pointer. The caller need to call dev_pm_opp_put_supported_hw() the same
number of times later on to drop all the references.

To avoid adding another counter to count how many times
dev_pm_opp_set_supported_hw() is called for the same OPP table,
dev_pm_opp_put_supported_hw() frees the resources on the very first call
made to it, assuming that the caller would be calling it sequentially
for all the CPUs. We can revisit that if that assumption is broken in
the future.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2018-05-22 17:00:09 +05:30
Dan Carpenter 6a89e012aa PM / OPP: silence an uninitialized variable warning
Smatch complains that it's possible we print "rate" in the debug output
when it hasn't been initialized.  It should be zero on that path.

Fixes: a1e8c13600 ("PM / OPP: "opp-hz" is optional for power domains")
[ Viresh: Added the Fixes tag ]
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2018-05-16 15:25:44 +05:30
Viresh Kumar 28fa4aca26 PM / OPP: Remove dev_pm_opp_{un}register_get_pstate_helper()
These helpers aren't used anymore, remove them.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:21 +05:30
Viresh Kumar 3ba98324e8 PM / OPP: Get performance state using genpd helper
The genpd core provides an API now to retrieve the performance state
from DT, use that instead of the ->get_pstate() callback.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:20 +05:30
Viresh Kumar e2f4b5f8dc PM / OPP: Implement dev_pm_opp_get_of_node()
This adds a new helper to let the power domain drivers to access
opp->np, so that they can read platform specific properties from the
node.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:19 +05:30
Viresh Kumar a88bd2a51e PM / OPP: Implement of_dev_pm_opp_find_required_opp()
A device's DT node or its OPP nodes can contain a phandle to other
device's OPP node, in the "required-opps" property.

This patch implements a routine to find that required OPP from the node
that contains the "required-opps" property.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:19 +05:30
Viresh Kumar fa9b274f8a PM / OPP: Implement dev_pm_opp_of_add_table_indexed()
The "operating-points-v2" property can contain a list of phandles now,
specifically for the power domain providers that provide multiple
domains.

Add support to parse that.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:18 +05:30
Viresh Kumar a1e8c13600 PM / OPP: "opp-hz" is optional for power domains
"opp-hz" property is optional for power domains now and we shouldn't
error out if it is missing for power domains.

This patch creates two new routines, _get_opp_count() and
_opp_is_duplicate(), by separating existing code from their parent
functions. Also skip duplicate OPP check for power domain OPPs as they
may not have any the "opp-hz" field, but a platform specific performance
state binding to uniquely identify OPP nodes.

By default the debugfs OPP nodes are named using the "rate" value, but
that isn't possible for the power domain OPP nodes and hence they use
the index of the OPP node in the OPP node list instead.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-05-09 10:15:18 +05:30
Jia-Ju Bai 4a823c0be8 opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table
After checking all possible call chains to
dev_pm_opp_init_cpufreq_table() here,
my tool finds that this function is never called in atomic context,
namely never in an interrupt handler or holding a spinlock.
And dev_pm_opp_init_cpufreq_table() calls dev_pm_opp_get_opp_count(),
which calls mutex_lock that can sleep.
It indicates that atmtcp_v_send() can call functions which may sleep.
Thus GFP_ATOMIC is not necessary, and it can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2018-02-12 15:07:46 +05:30
Wei Yongjun 3eff5f67a2 PM / OPP: Make local function ti_opp_supply_set_opp() static
Fixes the following sparse warning:

drivers/opp/ti-opp-supply.c:276:5: warning:
 symbol 'ti_opp_supply_set_opp' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-12-28 12:48:16 +01:00
Dave Gerlach 9a835fa6e4 PM / OPP: Add ti-opp-supply driver
Introduce a ti-opp-supply driver that will use new multiple regulator
support that is part of the OPP core This is needed on TI platforms like
DRA7/AM57 in order to control both CPU regulator and Adaptive Body Bias
(ABB) regulator. These regulators must be scaled in sequence during an
OPP transition depending on whether or not the frequency is being scaled
up or down.

This driver also implements AVS Class0 for these parts by looking up the
required values from registers in the SoC and programming adjusted
optimal voltage values for each OPP.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-12-17 19:17:44 +01:00
Viresh Kumar b6aa98364f PM / OPP: Add dev_pm_opp_{un}register_get_pstate_helper()
This adds the dev_pm_opp_{un}register_get_pstate_helper() helper
routines which will be used to set the get_pstate() callback for a
device. This callback will be later called internally by the OPP core to
get performance state corresponding to an OPP.

This is required temporarily until the time we have proper DT bindings
to include the performance state information.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-14 00:54:41 +02:00
Viresh Kumar 009acd196f PM / OPP: Support updating performance state of device's power domain
The genpd framework now provides an API to request device's power
domain to update its performance state.  Use that interface from the
OPP core for devices whose power domains support performance states.

Note that this commit doesn't add any mechanism by which performance
states are made available to the OPP core. That would be done by a
later commit.

Note that the current implementation is restricted to the case where
the device doesn't have separate regulators for itself. We shouldn't
over engineer the code before we have real use case for them. We can
always come back and add more code to support such cases later on.

Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-14 00:54:40 +02:00
Sudeep Holla 9867999f3a PM / OPP: add missing of_node_put() for of_get_cpu_node()
Commit 762792913f (PM / OPP: Fix get sharing CPUs when hotplug
is used) moved away from using cpu_dev->of_node because of some
limitations.

However, commit 7467c9d959 (of: return of_get_cpu_node from
of_cpu_device_node_get if CPUs are not registered) added support to
fall back to of_get_cpu_node() if called if CPUs are not registered
yet.

Add the missing of_node_put() for the CPU device nodes. Also go back
to using of_cpu_device_node_get() in dev_pm_opp_of_get_sharing_cpus()
to avoid scanning the device tree again.

Acked-by: Viresh Kumar <vireshk@kernel.org>
Fixes: 762792913f (PM / OPP: Fix get sharing CPUs when hotplug is used)
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-14 00:49:41 +02:00
Viresh Kumar 604a7aeb43 PM / OPP: Rename dev_pm_opp_register_put_opp_helper()
The routine is named incorrectly since the first attempt as there is
nothing like a put_opp() helper. We wanted to unregister the set_opp()
helper here and so it should rather be named as
dev_pm_opp_unregister_set_opp_helper().

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11 01:54:18 +02:00
Tobias Jordan 7978db3447 PM / OPP: Add missing of_node_put(np)
The for_each_available_child_of_node() loop in _of_add_opp_table_v2()
doesn't drop the reference to "np" on errors. Fix that.

Fixes: 274659029c (PM / OPP: Add support to parse "operating-points-v2" bindings)
Cc: 4.3+ <stable@vger.kernel.org> # 4.3+
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
[ VK: Improved commit log. ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11 01:53:22 +02:00
Fabio Estevam 035ed07208 PM / OPP: Move error message to debug level
On some i.MX6 platforms which do not have speed grading
check, opp table will not be created in platform code,
so cpufreq driver prints the following error message:

cpu cpu0: dev_pm_opp_get_opp_count: OPP table not found (-19)

However, this is not really an error in this case because the
imx6q-cpufreq driver first calls dev_pm_opp_get_opp_count()
and if it fails, it means that platform code does not provide
OPP and then dev_pm_opp_of_add_table() will be called.

In order to avoid such confusing error message, move it to
debug level.

It is up to the caller of dev_pm_opp_get_opp_count() to check its
return value and decide if it will print an error or not.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11 01:51:15 +02:00
Arvind Yadav d741029a23 PM / OPP: Use snprintf() to avoid kasprintf() and kfree()
Use snprintf() to avoid unnecessary initializations, avoid calling
kfree().

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11 01:49:17 +02:00
Viresh Kumar 7813dd6fc7 PM / OPP: Move the OPP directory out of power/
The drivers/base/power/ directory is special and contains code related
to power management core like system suspend/resume, hibernation, etc.
It was fine to keep the OPP code inside it when we had just one file for
it, but it is growing now and already has a directory for itself.

Lets move it directly under drivers/ directory, just like cpufreq and
cpuidle.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-03 02:45:12 +02:00