drm/gma500: Remove unnecessary suspend/resume wrappers

The psb_runtime_suspend/resume/thaw/freeze/restore functions are all
just 1:1 wrappers around gma_power_suspend/_resume.

Drop these wrappers and use the DEFINE_RUNTIME_DEV_PM_OPS() macro to
define the dev_pm_ops struct.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220909115646.99920-7-hdegoede@redhat.com

drm/gma500: Rewrite power management code

Rewrite the power.c code. For some reason this was doing locking +
refcounting + state (suspended or not) bookkeeping all by itself.

But there is no reason for this, this is all taken care of by
the runtime-pm core, through pm_runtime_get()/_put().

Besides this not being necessary the DIY code is also quite weird/
buggy in some places. E.g. power_begin() would manually do a resume
when not resumed already and force_on=true, followed by a
pm_runtime_get(), which will cause a call to gma_power_resume() to
get scheduled which would redo the entire resume again. Which can
all be replaced by a single pm_runtime_get_sync() call.

Note that this is just a cleanup, this does not actually fix
the (disabled through #if 0) runtime-pm support. It does now call
pm_runtime_enable(), but only after doing a pm_runtime_get() at
probe-time, so the device is never runtime suspended.

Doing this permanent get() + enable() instead of not calling
enable() at all is necessary for the pm_runtime_get_if_in_use() call
in gma_power_begin() to work properly.

Note this also removes the gma_power_is_on() call a check like this
without actually holding a reference is always racy, so it is a bad
idea (and therefor has no pm_runtime_foo() equivalent).

The 2 code paths which were using gma_power_is_on() are actually both
guaranteed to only run when the device is powered-on so the 2 checks
can simply be dropped.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220909115646.99920-6-hdegoede@redhat.com

drm/gma500: drop drmP.h from header files

Drop use of drmp.h from all header files in drm/gma500.
Fix fallout in all files.
In some cases moved include lines and sorted them too.
With drmP.h removed from all header files it can now be removed from
each .c file without any further dependencies

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190519195526.3422-3-sam@ravnborg.org

drm/gma500: Add hooks for hibernation

Currently we do whatever is done during suspend/resume but we might need some
more work for hibernation so keep them in separate functions.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

gma500: Add device framework

The devices have various internal differences so we have some abstractions
to hide the ugly differences and we then wrap them up in standard
interfaces. Add these bits

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>