rga2: enable suspend/resume from upstream

drivers/video/rockchip/rga2/rga2_drv.c

@@ -2203,6 +2203,67 @@ static int rga2_drv_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int rga_enable_clocks(struct device *dev)
+{
+    int ret;
+
+    ret = clk_prepare_enable(rga2_drvdata->clk_rga2);
+    if (ret) {
+        pr_err("Cannot enable rga sclk: %d\n", ret);
+        return ret;
+    }
+
+    ret = clk_prepare_enable(rga2_drvdata->aclk_rga2);
+    if (ret) {
+        pr_err("Cannot enable rga aclk: %d\n", ret);
+        goto err_disable_sclk;
+    }
+
+    ret = clk_prepare_enable(rga2_drvdata->hclk_rga2);
+    if (ret) {
+        pr_err("Cannot enable rga hclk: %d\n", ret);
+        goto err_disable_aclk;
+    }
+
+    return 0;
+
+err_disable_sclk:
+	clk_disable_unprepare(rga2_drvdata->clk_rga2);
+err_disable_aclk:
+	clk_disable_unprepare(rga2_drvdata->aclk_rga2);
+
+    return ret;
+}
+
+
+static void rga_disable_clocks(struct device *dev)
+{
+    (void)dev;
+	clk_disable_unprepare(rga2_drvdata->clk_rga2);
+	clk_disable_unprepare(rga2_drvdata->hclk_rga2);
+	clk_disable_unprepare(rga2_drvdata->aclk_rga2);
+}
+
+
+static int __maybe_unused rga_runtime_suspend(struct device *dev)
+{
+    rga_disable_clocks(dev);
+
+    return 0;
+}
+
+static int __maybe_unused rga_runtime_resume(struct device *dev)
+{
+    return rga_enable_clocks(dev);
+}
+
+
+static const struct dev_pm_ops rga_pm = {
+    SET_RUNTIME_PM_OPS(rga_runtime_suspend,
+        rga_runtime_resume, NULL)
+};
+
+
 static struct platform_driver rga2_driver = {
 	.probe		= rga2_drv_probe,
 	.remove		= rga2_drv_remove,
@@ -2211,6 +2272,7 @@ static struct platform_driver rga2_driver = {
 		.owner  = THIS_MODULE,
 #endif
 		.name	= "rga2",
+		.pm     = &rga_pm,
 		.of_match_table = of_match_ptr(rockchip_rga_dt_ids),
 	},
 };