drm/i915: don't read cursor registers on powered down pipes

At i915_display_info, don't call cursor_position() for a disabled
CRTC, since the CRTC may be on a powered down pipe, and this will
cause "Unclaimed register before interrupt" error messages.

Testcase: igt/pm_pc8/debugfs-read
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2334,7 +2334,7 @@ static int i915_display_info(struct seq_file *m, void *unused)
 		seq_printf(m, "CRTC %d: pipe: %c, active: %s\n",
 			   crtc->base.base.id, pipe_name(crtc->pipe),
 			   yesno(crtc->active));
-		if (crtc->active)
+		if (crtc->active) {
 			intel_crtc_info(m, crtc);
 
 			active = cursor_position(dev, crtc->pipe, &x, &y);
@@ -2343,6 +2343,7 @@ static int i915_display_info(struct seq_file *m, void *unused)
 				   x, y, crtc->cursor_addr,
 				   yesno(active));
 		}
+	}
 
 	seq_printf(m, "\n");
 	seq_printf(m, "Connector info\n");