drm/i915: Move cdclk and pll setup to intel_modeset_compute_config(), v2.

It makes more sense there, since these are computation steps that can
fail.

Changes since v1:
- Rename __intel_set_mode_checks to intel_modeset_checks (Matt Roper)
- Move intel_modeset_checks to before check_planes, so it won't
  have to be moved later.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -12758,38 +12758,7 @@ static void update_scanline_offset(struct intel_crtc *crtc)
 		crtc->scanline_offset = 1;
 }
 
-static int
-intel_modeset_compute_config(struct drm_atomic_state *state)
-{
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *crtc_state;
-	int ret, i;
-
-	ret = drm_atomic_helper_check_modeset(state->dev, state);
-	if (ret)
-		return ret;
-
-	for_each_crtc_in_state(state, crtc, crtc_state, i) {
-		if (!crtc_state->enable &&
-		    WARN_ON(crtc_state->active))
-			crtc_state->active = false;
-
-		if (!crtc_state->enable)
-			continue;
-
-		ret = intel_modeset_pipe_config(crtc, state);
-		if (ret)
-			return ret;
-
-		intel_dump_pipe_config(to_intel_crtc(crtc),
-				       to_intel_crtc_state(crtc_state),
-				       "[modeset]");
-	}
-
-	return drm_atomic_helper_check_planes(state->dev, state);
-}
-
-static int __intel_set_mode_setup_plls(struct drm_atomic_state *state)
+static int intel_modeset_setup_plls(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -12839,7 +12808,7 @@ static int __intel_set_mode_setup_plls(struct drm_atomic_state *state)
 }
 
 /* Code that should eventually be part of atomic_check() */
-static int __intel_set_mode_checks(struct drm_atomic_state *state)
+static int intel_modeset_checks(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	int ret;
@@ -12861,11 +12830,42 @@ static int __intel_set_mode_checks(struct drm_atomic_state *state)
 			return ret;
 	}
 
-	ret = __intel_set_mode_setup_plls(state);
+	return intel_modeset_setup_plls(state);
+}
+
+static int
+intel_modeset_compute_config(struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *crtc_state;
+	int ret, i;
+
+	ret = drm_atomic_helper_check_modeset(state->dev, state);
 	if (ret)
 		return ret;
 
-	return 0;
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		if (!crtc_state->enable &&
+		    WARN_ON(crtc_state->active))
+			crtc_state->active = false;
+
+		if (!crtc_state->enable)
+			continue;
+
+		ret = intel_modeset_pipe_config(crtc, state);
+		if (ret)
+			return ret;
+
+		intel_dump_pipe_config(to_intel_crtc(crtc),
+				       to_intel_crtc_state(crtc_state),
+				       "[modeset]");
+	}
+
+	ret = intel_modeset_checks(state);
+	if (ret)
+		return ret;
+
+	return drm_atomic_helper_check_planes(state->dev, state);
 }
 
 static int __intel_set_mode(struct drm_atomic_state *state)
@@ -12877,10 +12877,6 @@ static int __intel_set_mode(struct drm_atomic_state *state)
 	int ret = 0;
 	int i;
 
-	ret = __intel_set_mode_checks(state);
-	if (ret < 0)
-		return ret;
-
 	ret = drm_atomic_helper_prepare_planes(dev, state);
 	if (ret)
 		return ret;