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>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 23a65168d5ba..2bf7c42268e1 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2334,14 +2334,15 @@ 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);
-                seq_printf(m, "\tcursor visible? %s, position (%d, %d), addr 0x%08x, active? %s\n",
-                           yesno(crtc->cursor_visible),
-                           x, y, crtc->cursor_addr,
-                           yesno(active));
+                        active = cursor_position(dev, crtc->pipe, &x, &y);
+                        seq_printf(m, "\tcursor visible? %s, position (%d, %d), addr 0x%08x, active? %s\n",
+                                   yesno(crtc->cursor_visible),
+                                   x, y, crtc->cursor_addr,
+                                   yesno(active));
+                }
         }
 
         seq_printf(m, "\n");