ADd suspend hooks to hisi_drm_drv.c

diff --git a/drivers/gpu/drm/hisilicon/hisi_drm_drv.c b/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
index 76eb711..508643e 100644
--- a/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hisi_drm_drv.c
@@ -227,12 +227,124 @@  static const struct component_master_ops hisi_drm_ops = {
 	.unbind = hisi_drm_unbind,
 };
 
+static int exynos_drm_suspend(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+
+	drm_modeset_lock_all(dev);
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		int old_dpms = connector->dpms;
+
+		if (connector->funcs->dpms)
+			connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
+
+		/* Set the old mode back to the connector for resume */
+		connector->dpms = old_dpms;
+	}
+	drm_modeset_unlock_all(dev);
+
+	return 0;
+}
+
+static int exynos_drm_resume(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+
+	/* reset all the states of crtc/plane/encoder/connector */
+	drm_mode_config_reset(dev);
+
+	/* init kms poll for handling hpd */
+	drm_kms_helper_poll_init(dev);
+
+	/* force detection after connectors init */
+	(void)drm_helper_hpd_irq_event(dev);
+
+
+	drm_modeset_lock_all(dev);
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		if (connector->funcs->dpms) {
+			int dpms = connector->dpms;
+
+			connector->dpms = DRM_MODE_DPMS_OFF;
+			connector->funcs->dpms(connector, dpms);
+		}
+	}
+	drm_modeset_unlock_all(dev);
+
+	return 0;
+}
+
+static int host1x_drm_suspend(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	drm_kms_helper_poll_disable(drm);
+
+	exynos_drm_suspend(drm);
+
+	return 0;
+}
+
+static int host1x_drm_resume(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	exynos_drm_resume(drm);
+
+	drm_kms_helper_poll_enable(drm);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
+			host1x_drm_resume);
+
+static ssize_t
+sysfs_show_current_drmstate(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	ssize_t count = 0;
+
+	count = snprintf(buf, PAGE_SIZE, "%s\n", "johntest");
+
+	return count;
+}
+static ssize_t sysfs_set_drmstate(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	ssize_t ret = count;
+
+	if (count < 1)
+		return count;
+
+	/* strip of \n: */
+	if (buf[count-1] == '\n')
+		count--;
+
+	if (!strncmp(buf, "off", count)) {
+		host1x_drm_suspend(dev);
+	} else if (!strncmp(buf, "on", count)) {
+		host1x_drm_resume(dev);
+	} else {
+		printk("JDB: dunno what that is..\n");
+	}
+
+	return ret;
+
+}
+static DEVICE_ATTR(drm_test_state, 0644, sysfs_show_current_drmstate,
+			sysfs_set_drmstate);
+
 static int hisi_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
 	struct device_node *child_np;
 	struct component_match *match = NULL;
+	int error;
+
+	error = device_create_file(dev, &dev_attr_drm_test_state);
 
 	of_platform_populate(node, NULL, NULL, dev);
 
@@ -245,6 +357,10 @@  static int hisi_drm_platform_probe(struct platform_device *pdev)
 
 	return component_master_add_with_match(dev, &hisi_drm_ops, match);
 
+
+
+
+
 	return 0;
 }
 
@@ -261,6 +377,7 @@  static const struct of_device_id hisi_drm_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, hisi_drm_dt_ids);
 
+
 static struct platform_driver hisi_drm_platform_driver = {
 	.probe = hisi_drm_platform_probe,
 	.remove = hisi_drm_platform_remove,
@@ -268,6 +385,7 @@  static struct platform_driver hisi_drm_platform_driver = {
 		.owner = THIS_MODULE,
 		.name = DRIVER_NAME,
 		.of_match_table = hisi_drm_dt_ids,
+		.pm = &host1x_drm_pm_ops,
 	},
 };