drm/i915: don't disable fdi links harder in ilk_crtc_enable

Because they should have been disabled when shutting down the display
pipe previously. To ensure that this is the case, add a few assserts
instead of unconditionally disabling the fdi link.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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 b20fad3..5e42a03 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3184,10 +3184,12 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 
        is_pch_port = intel_crtc_driving_pch(crtc);
 
-       if (is_pch_port)
+       if (is_pch_port) {
                ironlake_fdi_pll_enable(intel_crtc);
-       else
-               ironlake_fdi_disable(crtc);
+       } else {
+               assert_fdi_tx_disabled(dev_priv, pipe);
+               assert_fdi_rx_disabled(dev_priv, pipe);
+       }
 
        for_each_encoder_on_crtc(dev, crtc, encoder)
                if (encoder->pre_enable)