drm: imx/dcss: Remove #ifdef guards for PM related functions

Use the EXPORT_GPL_DEV_PM_OPS() and pm_ptr() macros to handle the PM
callbacks.

These macros allow the PM functions to be automatically dropped by the
compiler when CONFIG_PM is disabled, without having to use #ifdef
guards.

This has the advantage of always compiling these functions in,
independently of any Kconfig option. Thanks to that, bugs and other
regressions are subsequently easier to catch.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Tested-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221129191733.137897-11-paul@crapouillou.net

drivers/gpu/drm/imx/dcss/dcss-dev.c

@@ -249,8 +249,7 @@ void dcss_dev_destroy(struct dcss_dev *dcss)
 	kfree(dcss);
 }
 
-#ifdef CONFIG_PM_SLEEP
-int dcss_dev_suspend(struct device *dev)
+static int dcss_dev_suspend(struct device *dev)
 {
 	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 	struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
@@ -273,7 +272,7 @@ int dcss_dev_suspend(struct device *dev)
 	return 0;
 }
 
-int dcss_dev_resume(struct device *dev)
+static int dcss_dev_resume(struct device *dev)
 {
 	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 	struct drm_device *ddev = dcss_drv_dev_to_drm(dev);
@@ -296,10 +295,8 @@ int dcss_dev_resume(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM_SLEEP */
 
-#ifdef CONFIG_PM
-int dcss_dev_runtime_suspend(struct device *dev)
+static int dcss_dev_runtime_suspend(struct device *dev)
 {
 	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 	int ret;
@@ -313,7 +310,7 @@ int dcss_dev_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-int dcss_dev_runtime_resume(struct device *dev)
+static int dcss_dev_runtime_resume(struct device *dev)
 {
 	struct dcss_dev *dcss = dcss_drv_dev_to_dcss(dev);
 
@@ -325,4 +322,8 @@ int dcss_dev_runtime_resume(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
+
+EXPORT_GPL_DEV_PM_OPS(dcss_dev_pm_ops) = {
+	RUNTIME_PM_OPS(dcss_dev_runtime_suspend, dcss_dev_runtime_resume, NULL)
+	SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)
+};

drivers/gpu/drm/imx/dcss/dcss-dev.h

@@ -9,6 +9,7 @@
 #include <drm/drm_fourcc.h>
 #include <drm/drm_plane.h>
 #include <linux/io.h>
+#include <linux/pm.h>
 #include <video/videomode.h>
 
 #define SET			0x04
@@ -95,13 +96,11 @@ struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev);
 struct drm_device *dcss_drv_dev_to_drm(struct device *dev);
 struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output);
 void dcss_dev_destroy(struct dcss_dev *dcss);
-int dcss_dev_runtime_suspend(struct device *dev);
-int dcss_dev_runtime_resume(struct device *dev);
-int dcss_dev_suspend(struct device *dev);
-int dcss_dev_resume(struct device *dev);
 void dcss_enable_dtg_and_ss(struct dcss_dev *dcss);
 void dcss_disable_dtg_and_ss(struct dcss_dev *dcss);
 
+extern const struct dev_pm_ops dcss_dev_pm_ops;
+
 /* BLKCTL */
 int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base);
 void dcss_blkctl_cfg(struct dcss_blkctl *blkctl);

drivers/gpu/drm/imx/dcss/dcss-drv.c

@@ -117,19 +117,13 @@ static const struct of_device_id dcss_of_match[] = {
 
 MODULE_DEVICE_TABLE(of, dcss_of_match);
 
-static const struct dev_pm_ops dcss_dev_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(dcss_dev_suspend, dcss_dev_resume)
-	SET_RUNTIME_PM_OPS(dcss_dev_runtime_suspend,
-			   dcss_dev_runtime_resume, NULL)
-};
-
 static struct platform_driver dcss_platform_driver = {
 	.probe	= dcss_drv_platform_probe,
 	.remove	= dcss_drv_platform_remove,
 	.driver	= {
 		.name = "imx-dcss",
 		.of_match_table	= dcss_of_match,
-		.pm = &dcss_dev_pm,
+		.pm = pm_ptr(&dcss_dev_pm_ops),
 	},
 };