drm/i915: Sanitize prepare_pipes after valleyview_modeset_global_pipes()

valleyview_modeset_global_pipes() may add pipes that are getting fully
disabled to prepare_pipes bitmask. The rest of the code doesn't expect
this, so clear out any such pipes from the prepare_pipes bitmask.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.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 3c17e95..e36b3b0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9493,10 +9493,14 @@ static int __intel_set_mode(struct drm_crtc *crtc,
         * mode set on this crtc.  For other crtcs we need to use the
         * adjusted_mode bits in the crtc directly.
         */
-       if (IS_VALLEYVIEW(dev))
+       if (IS_VALLEYVIEW(dev)) {
                valleyview_modeset_global_pipes(dev, &prepare_pipes,
                                                modeset_pipes, pipe_config);
 
+               /* may have added more to prepare_pipes than we should */
+               prepare_pipes &= ~disable_pipes;
+       }
+
        for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
                intel_crtc_disable(&intel_crtc->base);