OMAPDSS: HDMI: Replace dssdev->manager with dssdev->output->manager references

With addition of output entities, a device connects to an output, and an output
connects to overlay manager. Replace the dssdev->manager references with
dssdev->output->manager to access the manager correctly.

When enabling the HDMI output, check whether the output entity connected to
display is not NULL.
Signed-off-by: Archit Taneja <archit@ti.com>

drivers/video/omap2/dss/hdmi.c

@@ -504,6 +504,7 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 {
 	int r;
 	struct omap_video_timings *p;
+	struct omap_overlay_manager *mgr = dssdev->output->manager;
 	unsigned long phy;
 
 	gpio_set_value(hdmi.ct_cp_hpd_gpio, 1);
@@ -520,7 +521,7 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 	if (r)
 		goto err_runtime_get;
 
-	dss_mgr_disable(dssdev->manager);
+	dss_mgr_disable(mgr);
 
 	p = &hdmi.ip_data.cfg.timings;
 
@@ -562,13 +563,13 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 	dispc_enable_gamma_table(0);
 
 	/* tv size */
-	dss_mgr_set_timings(dssdev->manager, p);
+	dss_mgr_set_timings(mgr, p);
 
 	r = hdmi.ip_data.ops->video_enable(&hdmi.ip_data);
 	if (r)
 		goto err_vid_enable;
 
-	r = dss_mgr_enable(dssdev->manager);
+	r = dss_mgr_enable(mgr);
 	if (r)
 		goto err_mgr_enable;
 
@@ -592,7 +593,9 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 
 static void hdmi_power_off(struct omap_dss_device *dssdev)
 {
-	dss_mgr_disable(dssdev->manager);
+	struct omap_overlay_manager *mgr = dssdev->output->manager;
+
+	dss_mgr_disable(mgr);
 
 	hdmi.ip_data.ops->video_disable(&hdmi.ip_data);
 	hdmi.ip_data.ops->phy_disable(&hdmi.ip_data);
@@ -689,14 +692,15 @@ bool omapdss_hdmi_detect(void)
 
 int omapdss_hdmi_display_enable(struct omap_dss_device *dssdev)
 {
+	struct omap_dss_output *out = dssdev->output;
 	int r = 0;
 
 	DSSDBG("ENTER hdmi_display_enable\n");
 
 	mutex_lock(&hdmi.lock);
 
-	if (dssdev->manager == NULL) {
-		DSSERR("failed to enable display: no manager\n");
+	if (out == NULL || out->manager == NULL) {
+		DSSERR("failed to enable display: no output/manager\n");
 		r = -ENODEV;
 		goto err0;
 	}