drm/omap: hdmi4: Ensure the device is active during bind

The bind function performs hardware access (in hdmi4_cec_init()) and
thus requires the device to be active. Ensure this by surrounding the
bind function by hdmi_runtime_get() and hdmi_runtime_put() calls.

Fixes: 27d62452 ("drm/omap: dss: Acquire next dssdev at probe time")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181110111654.4387-3-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -635,10 +635,14 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
 
 	hdmi->dss = dss;
 
-	r = hdmi_pll_init(dss, hdmi->pdev, &hdmi->pll, &hdmi->wp);
+	r = hdmi_runtime_get(hdmi);
 	if (r)
 		return r;
 
+	r = hdmi_pll_init(dss, hdmi->pdev, &hdmi->pll, &hdmi->wp);
+	if (r)
+		goto err_runtime_put;
+
 	r = hdmi4_cec_init(hdmi->pdev, &hdmi->core, &hdmi->wp);
 	if (r)
 		goto err_pll_uninit;
@@ -652,12 +656,16 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
 	hdmi->debugfs = dss_debugfs_create_file(dss, "hdmi", hdmi_dump_regs,
 					       hdmi);
 
+	hdmi_runtime_put(hdmi);
+
 	return 0;
 
 err_cec_uninit:
 	hdmi4_cec_uninit(&hdmi->core);
 err_pll_uninit:
 	hdmi_pll_uninit(&hdmi->pll);
+err_runtime_put:
+	hdmi_runtime_put(hdmi);
 	return r;
 }