drm/i915: Covert ILK-IVB to choose DPLLS before disabling CRTCs

Use the infrastructure added in a previous patch to choose shared DPLLs
and calculate clocks before touching the hardware.

v2: Don't set mode_set hooks since dev_priv is kzalloc()'d (Ville)
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -7418,9 +7418,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
 	return dpll | DPLL_VCO_ENABLE;
 }
 
-static int ironlake_crtc_mode_set(struct intel_crtc *crtc,
-				  int x, int y,
-				  struct drm_framebuffer *fb)
+static int ironlake_crtc_compute_clock(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
 	intel_clock_t clock, reduced_clock;
@@ -7466,17 +7464,13 @@ static int ironlake_crtc_mode_set(struct intel_crtc *crtc,
 		else
 			crtc->new_config->dpll_hw_state.fp1 = fp;
 
-		if (intel_crtc_to_shared_dpll(crtc))
-			intel_put_shared_dpll(crtc);
-
 		pll = intel_get_shared_dpll(crtc);
 		if (pll == NULL) {
 			DRM_DEBUG_DRIVER("failed to find PLL for pipe %c\n",
 					 pipe_name(crtc->pipe));
 			return -EINVAL;
 		}
-	} else
-		intel_put_shared_dpll(crtc);
+	}
 
 	if (is_lvds && has_reduced_clock && i915.powersave)
 		crtc->lowfreq_avail = true;
@@ -12480,7 +12474,8 @@ static void intel_init_display(struct drm_device *dev)
 	} else if (HAS_PCH_SPLIT(dev)) {
 		dev_priv->display.get_pipe_config = ironlake_get_pipe_config;
 		dev_priv->display.get_plane_config = ironlake_get_plane_config;
-		dev_priv->display.crtc_mode_set = ironlake_crtc_mode_set;
+		dev_priv->display.crtc_compute_clock =
+			ironlake_crtc_compute_clock;
 		dev_priv->display.crtc_enable = ironlake_crtc_enable;
 		dev_priv->display.crtc_disable = ironlake_crtc_disable;
 		dev_priv->display.off = ironlake_crtc_off;