drm/i915/display: Runtime pm wrappers for display parent interface

Implement runtime pm wrappers for i915 driver and add them into display
parent interface.

v2:
  - move i915 display rpm interface implementation to intel_runtime_pm.c
  - rename intel_display as i915_display

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patch.msgid.link/20251030202836.1815680-4-jouni.hogander@intel.com

Author: hogander

drivers/gpu/drm/i915/i915_driver.c

@@ -740,6 +740,7 @@ static void i915_welcome_messages(struct drm_i915_private *dev_priv)
 }
 
 static const struct intel_display_parent_interface parent = {
+	.rpm = &i915_display_rpm_interface,
 };
 
 const struct intel_display_parent_interface *i915_driver_parent_interface(void)

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -29,6 +29,7 @@
 #include <linux/pm_runtime.h>
 
 #include <drm/drm_print.h>
+#include <drm/intel/display_parent_interface.h>
 
 #include "i915_drv.h"
 #include "i915_trace.h"
@@ -177,6 +178,82 @@ static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm,
 	return track_intel_runtime_pm_wakeref(rpm);
 }
 
+static struct intel_runtime_pm *drm_to_rpm(const struct drm_device *drm)
+{
+	struct drm_i915_private *i915 = to_i915(drm);
+
+	return &i915->runtime_pm;
+}
+
+static struct ref_tracker *i915_display_rpm_get(const struct drm_device *drm)
+{
+	return intel_runtime_pm_get(drm_to_rpm(drm));
+}
+
+static struct ref_tracker *i915_display_rpm_get_raw(const struct drm_device *drm)
+{
+	return intel_runtime_pm_get_raw(drm_to_rpm(drm));
+}
+
+static struct ref_tracker *i915_display_rpm_get_if_in_use(const struct drm_device *drm)
+{
+	return intel_runtime_pm_get_if_in_use(drm_to_rpm(drm));
+}
+
+static struct ref_tracker *i915_display_rpm_get_noresume(const struct drm_device *drm)
+{
+	return intel_runtime_pm_get_noresume(drm_to_rpm(drm));
+}
+
+static void i915_display_rpm_put(const struct drm_device *drm, struct ref_tracker *wakeref)
+{
+	intel_runtime_pm_put(drm_to_rpm(drm), wakeref);
+}
+
+static void i915_display_rpm_put_raw(const struct drm_device *drm, struct ref_tracker *wakeref)
+{
+	intel_runtime_pm_put_raw(drm_to_rpm(drm), wakeref);
+}
+
+static void i915_display_rpm_put_unchecked(const struct drm_device *drm)
+{
+	intel_runtime_pm_put_unchecked(drm_to_rpm(drm));
+}
+
+static bool i915_display_rpm_suspended(const struct drm_device *drm)
+{
+	return intel_runtime_pm_suspended(drm_to_rpm(drm));
+}
+
+static void i915_display_rpm_assert_held(const struct drm_device *drm)
+{
+	assert_rpm_wakelock_held(drm_to_rpm(drm));
+}
+
+static void i915_display_rpm_assert_block(const struct drm_device *drm)
+{
+	disable_rpm_wakeref_asserts(drm_to_rpm(drm));
+}
+
+static void i915_display_rpm_assert_unblock(const struct drm_device *drm)
+{
+	enable_rpm_wakeref_asserts(drm_to_rpm(drm));
+}
+
+const struct intel_display_rpm_interface i915_display_rpm_interface = {
+	.get = i915_display_rpm_get,
+	.get_raw = i915_display_rpm_get_raw,
+	.get_if_in_use = i915_display_rpm_get_if_in_use,
+	.get_noresume = i915_display_rpm_get_noresume,
+	.put = i915_display_rpm_put,
+	.put_raw = i915_display_rpm_put_raw,
+	.put_unchecked = i915_display_rpm_put_unchecked,
+	.suspended = i915_display_rpm_suspended,
+	.assert_held = i915_display_rpm_assert_held,
+	.assert_block = i915_display_rpm_assert_block,
+	.assert_unblock = i915_display_rpm_assert_unblock
+};
+
 /**
  * intel_runtime_pm_get_raw - grab a raw runtime pm reference
  * @rpm: the intel_runtime_pm structure

drivers/gpu/drm/i915/intel_runtime_pm.h

@@ -14,6 +14,7 @@
 struct device;
 struct drm_i915_private;
 struct drm_printer;
+struct intel_display_rpm_interface;
 
 /*
  * This struct helps tracking the state needed for runtime PM, which puts the
@@ -226,4 +227,6 @@ static inline void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 }
 #endif
 
+extern const struct intel_display_rpm_interface i915_display_rpm_interface;
+
 #endif /* __INTEL_RUNTIME_PM_H__ */