drm/gma500: Check connector status before restoring sdvo

This patch fixes a bug introduced by:

commit 749387dc8d8270b279f27a0a794cdf4f4a4aa774
Author: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Date:   Sun Apr 7 16:35:50 2013 +0200
drm/gma500: Fix hibernation problems on sdvo encoders

The bug is triggered when we do a mode set on a sdvo encoder with all
connectors in the disconnected state. A crtc is considered enabled by
drm even though all of its connectors are disconnected. Work around
this by adding a check in our sdvo restore function.

Also remove the unneeded dpms on. Prepare and Commit will take care of
that.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

drivers/gpu/drm/gma500/psb_intel_sdvo.c

@@ -1854,12 +1854,11 @@ static void psb_intel_sdvo_restore(struct drm_connector *connector)
 
 	REG_WRITE(sdvo->sdvo_reg, sdvo->saveSDVO);
 
-	/* Force dpms on upon resume */
-	psb_intel_sdvo_dpms(encoder, DRM_MODE_DPMS_ON);
-
 	/* Force a full mode set on the crtc. We're supposed to have the
 	   mode_config lock already. */
-	drm_crtc_helper_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, NULL);
+	if (connector->status == connector_status_connected)
+		drm_crtc_helper_set_mode(crtc, &crtc->mode, crtc->x, crtc->y,
+					 NULL);
 }
 
 static const struct drm_encoder_helper_funcs psb_intel_sdvo_helper_funcs = {