drm/rockchip: analogix_dp: add runtime PM handling

Hook up the runtime PM suspend/resume paths to make the rockchip
glue behave more like the exynos one. The same suspend/resume
functions are used for system sleep via the runtime PM force
suspend/resume.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240619182200.3752465-2-l.stach@pengutronix.de

drivers/gpu/drm/rockchip/analogix_dp-rockchip.c

@@ -13,6 +13,7 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/clk.h>
@@ -430,7 +431,6 @@ static void rockchip_dp_remove(struct platform_device *pdev)
 	analogix_dp_remove(dp->adp);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int rockchip_dp_suspend(struct device *dev)
 {
 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
@@ -450,14 +450,9 @@ static int rockchip_dp_resume(struct device *dev)
 
 	return analogix_dp_resume(dp->adp);
 }
-#endif
 
-static const struct dev_pm_ops rockchip_dp_pm_ops = {
-#ifdef CONFIG_PM_SLEEP
-	.suspend_late = rockchip_dp_suspend,
-	.resume_early = rockchip_dp_resume,
-#endif
-};
+static DEFINE_RUNTIME_DEV_PM_OPS(rockchip_dp_pm_ops, rockchip_dp_suspend,
+		rockchip_dp_resume, NULL);
 
 static const struct rockchip_dp_chip_data rk3399_edp = {
 	.lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
@@ -485,7 +480,7 @@ struct platform_driver rockchip_dp_driver = {
 	.remove_new = rockchip_dp_remove,
 	.driver = {
 		   .name = "rockchip-dp",
-		   .pm = &rockchip_dp_pm_ops,
+		   .pm = pm_ptr(&rockchip_dp_pm_ops),
 		   .of_match_table = rockchip_dp_dt_ids,
 	},
 };