[PATCH 01/26] drm: modeset-helper: Export dev_pm_ops for simple drivers

[Paul Cercueil]

Export a dev_pm_ops meant to be used with simple drivers, which have
their struct drm_device registered as their struct device's drvdata, and
only call drm_mode_config_pm_{suspend,resume}.

The symbol is conditionally exported if IS_ENABLED(CONFIG_PM_SLEEP), and
therefore it should always be referenced using the pm_sleep_ptr() macro.

Signed-off-by: Paul Cercueil <paul at crapouillou.net>
---
 drivers/gpu/drm/drm_modeset_helper.c | 32 ++++++++++++++++++++++++++++
 include/drm/drm_modeset_helper.h     |  4 ++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_modeset_helper.c
index f858dfedf2cf..0bc9f9228a60 100644
--- a/drivers/gpu/drm/drm_modeset_helper.c
+++ b/drivers/gpu/drm/drm_modeset_helper.c
@@ -20,6 +20,9 @@
  * OF THIS SOFTWARE.
  */
 
+#include <linux/device.h>
+#include <linux/pm.h>
+
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
@@ -244,3 +247,32 @@ int drm_mode_config_helper_resume(struct drm_device *dev)
 	return ret;
 }
 EXPORT_SYMBOL(drm_mode_config_helper_resume);
+
+static int drm_mode_config_pm_suspend(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(drm);
+}
+
+static int drm_mode_config_pm_resume(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(drm);
+}
+
+/**
+ * drm_mode_config_pm_ops - Exported dev_pm_ops helper for simple drivers
+ *
+ * This dev_pm_ops can be used for simple drivers that would otherwise only call
+ * drm_mode_config_helper_suspend / drm_mode_config_helper_resume in their PM
+ * callbacks. It is only valid if the driver's drm_device has been registered as
+ * the struct device's drvdata.
+ *
+ * The exported symbol must always be used with the pm_sleep_ptr() macro, like
+ * this:
+ * .pm = pm_sleep_ptr(&drm_mode_config_pm_ops),
+ */
+EXPORT_SIMPLE_DEV_PM_OPS(drm_mode_config_pm_ops,
+			 drm_mode_config_pm_suspend, drm_mode_config_pm_resume);
diff --git a/include/drm/drm_modeset_helper.h b/include/drm/drm_modeset_helper.h
index 995fd981cab0..85f29637e9c1 100644
--- a/include/drm/drm_modeset_helper.h
+++ b/include/drm/drm_modeset_helper.h
@@ -23,6 +23,8 @@
 #ifndef __DRM_KMS_HELPER_H__
 #define __DRM_KMS_HELPER_H__
 
+#include <linux/pm.h>
+
 struct drm_crtc;
 struct drm_crtc_funcs;
 struct drm_device;
@@ -41,4 +43,6 @@ int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 int drm_mode_config_helper_suspend(struct drm_device *dev);
 int drm_mode_config_helper_resume(struct drm_device *dev);
 
+extern const struct dev_pm_ops drm_mode_config_pm_ops;
+
 #endif
-- 
2.35.1