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

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

v3:
  - drop useless include
  - drop xe_display_rpm_{get, put}_raw
v2:
  - move xe_display_rpm_interface code into xe_display_rpm.c
  - rename xe_rpm as xe_display_rpm

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patch.msgid.link/20251030202836.1815680-5-jouni.hogander@intel.com

drivers/gpu/drm/xe/display/xe_display.c

@@ -35,6 +35,7 @@
 #include "intel_hotplug.h"
 #include "intel_opregion.h"
 #include "skl_watermark.h"
+#include "xe_display_rpm.h"
 #include "xe_module.h"
 
 /* Ensure drm and display members are placed properly. */
@@ -517,6 +518,7 @@ static void display_device_remove(struct drm_device *dev, void *arg)
 }
 
 static const struct intel_display_parent_interface parent = {
+	.rpm = &xe_display_rpm_interface,
 };
 
 /**

drivers/gpu/drm/xe/display/xe_display_rpm.c

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: MIT
 /* Copyright © 2025 Intel Corporation */
 
+#include <drm/intel/display_parent_interface.h>
+
 #include "intel_display_core.h"
 #include "intel_display_rpm.h"
 #include "xe_device.h"
@@ -71,3 +73,67 @@ void intel_display_rpm_assert_unblock(struct intel_display *display)
 {
 	/* FIXME */
 }
+
+static struct ref_tracker *xe_display_rpm_get(const struct drm_device *drm)
+{
+	return xe_pm_runtime_resume_and_get(to_xe_device(drm)) ? INTEL_WAKEREF_DEF : NULL;
+}
+
+static struct ref_tracker *xe_display_rpm_get_if_in_use(const struct drm_device *drm)
+{
+	return xe_pm_runtime_get_if_in_use(to_xe_device(drm)) ? INTEL_WAKEREF_DEF : NULL;
+}
+
+static struct ref_tracker *xe_display_rpm_get_noresume(const struct drm_device *drm)
+{
+	xe_pm_runtime_get_noresume(to_xe_device(drm));
+
+	return INTEL_WAKEREF_DEF;
+}
+
+static void xe_display_rpm_put(const struct drm_device *drm, struct ref_tracker *wakeref)
+{
+	if (wakeref)
+		xe_pm_runtime_put(to_xe_device(drm));
+}
+
+static void xe_display_rpm_put_unchecked(const struct drm_device *drm)
+{
+	xe_pm_runtime_put(to_xe_device(drm));
+}
+
+static bool xe_display_rpm_suspended(const struct drm_device *drm)
+{
+	struct xe_device *xe = to_xe_device(drm);
+
+	return pm_runtime_suspended(xe->drm.dev);
+}
+
+static void xe_display_rpm_assert_held(const struct drm_device *drm)
+{
+	/* FIXME */
+}
+
+static void xe_display_rpm_assert_block(const struct drm_device *drm)
+{
+	/* FIXME */
+}
+
+static void xe_display_rpm_assert_unblock(const struct drm_device *drm)
+{
+	/* FIXME */
+}
+
+const struct intel_display_rpm_interface xe_display_rpm_interface = {
+	.get = xe_display_rpm_get,
+	.get_raw = xe_display_rpm_get,
+	.get_if_in_use = xe_display_rpm_get_if_in_use,
+	.get_noresume = xe_display_rpm_get_noresume,
+	.put = xe_display_rpm_put,
+	.put_raw = xe_display_rpm_put,
+	.put_unchecked = xe_display_rpm_put_unchecked,
+	.suspended = xe_display_rpm_suspended,
+	.assert_held = xe_display_rpm_assert_held,
+	.assert_block = xe_display_rpm_assert_block,
+	.assert_unblock = xe_display_rpm_assert_unblock
+};

drivers/gpu/drm/xe/display/xe_display_rpm.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef _XE_DISPLAY_RPM_H_
+#define _XE_DISPLAY_RPM_H_
+
+extern const struct intel_display_rpm_interface xe_display_rpm_interface;
+
+#endif /* _XE_DISPLAY_RPM_H_ */