core: pm: add unregister_pm_cb()

Add unregister_pm_cb() API function and its helper variants to
allow unregistering a PM callback entry. This can be needed for
example in the GPIO framework where gp

core: pm: add unregister_pm_cb()

Add unregister_pm_cb() API function and its helper variants to
allow unregistering a PM callback entry. This can be needed for
example in the GPIO framework where gpio_put() can release a GPIO
that a driver no more consumed. In case a PM callback was previously
registered for such a GPIO, consumer driver needs mean to unregister
it.

This change implies that the PM callbacks list is protected from
concurrent accesses hence add a lock for that purpose.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

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core: pm: fix incorrect flag check in pm_callback

Fix test error check that always return true with current
condition. The check must be done to identify if the
SUSPENDED flag has been set.

Fixes:

core: pm: fix incorrect flag check in pm_callback

Fix test error check that always return true with current
condition. The check must be done to identify if the
SUSPENDED flag has been set.

Fixes: 5920ec258f16 ("core: kernel: pm: refine suspend/resume sequence order")
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: kernel: pm: initialize local variables

Initialize local variables in pm_change_state().

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@

core: kernel: pm: initialize local variables

Initialize local variables in pm_change_state().

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: kernel: pm: refine suspend/resume sequence order

Change PM generic implementation to call handlers for suspend in the
reserve order in which they were registered and to call handlers for
resum

core: kernel: pm: refine suspend/resume sequence order

Change PM generic implementation to call handlers for suspend in the
reserve order in which they were registered and to call handlers for
resume in the opposite order, that is the order in which the handlers
where registered.

This change allows to reuse the driver initialization ordering which is
expected to match device drivers dependencies. This change will be even
more useful when using probe support and dependencies resolution.

The change does not affect the 2 PM registration levels: core and drivers.
Core handlers are still suspends after drivers and resumed before
drivers.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Gatien Chevallier <gatien.chevallier@st.com>

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core: pm: add a name to registered pm_callback_handle

Adds an argument to register a name (string debug identifier) for
PM handlers registered to PM framework.

Caller can provide a NULL reference o

core: pm: add a name to registered pm_callback_handle

Adds an argument to register a name (string debug identifier) for
PM handlers registered to PM framework.

Caller can provide a NULL reference or a valid string pointer. When pager
is enabled, the registration ensures the name lies in an unpaged section,
possibly allocating heap for that purpose.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Gatien Chevallier <gatien.chevallier@st.com>

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core: kernel: pm.c: add missing header stdlib.h

This commit explicitly includes stdlib.h to use realloc() function.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Jerome

core: kernel: pm.c: add missing header stdlib.h

This commit explicitly includes stdlib.h to use realloc() function.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: framework to register PM callbacks

Introduce a framework for power management callback registering.

Drivers and services can register a callback function for the platform
suspend and resume s

core: framework to register PM callbacks

Introduce a framework for power management callback registering.

Drivers and services can register a callback function for the platform
suspend and resume sequences. A private address handle can be registered
with the callback and retrieved from the callback. Callback can be
registered with a specific call order as defined per PM_CB_ORDER_*.

Callback shall return an error if failing to complete target transition.
This information may be used by the platform to resume a platform on
non-fatal failure to suspend.

Callbacks are related to a callback level. It defines the callbacks
call ordering, allowing core low level drivers (as clocks or the GIC)
to be suspended after all drivers and resume before these.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Cedric Neveux <cedric.neveux@nxp.com>

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