drm/i915: Don't enable the cursor on a disable pipe

On HSW enabling a plane on a disabled pipe may hang the entire system.
And there's no good reason for doing it ever, so just don't.

v2: Move the crtc active checks to intel_crtc_cursor_{set,move} to
    avoid confusing people during modeset

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a38056d..d8a1d98 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6929,7 +6929,8 @@ static int intel_crtc_cursor_set(struct drm_crtc *crtc,
        intel_crtc->cursor_width = width;
        intel_crtc->cursor_height = height;
 
-       intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);
+       if (intel_crtc->active)
+               intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);
 
        return 0;
 fail_unpin:
@@ -6948,7 +6949,8 @@ static int intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
        intel_crtc->cursor_x = x;
        intel_crtc->cursor_y = y;
 
-       intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);
+       if (intel_crtc->active)
+               intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);
 
        return 0;
 }