drm/i915: implement new set_mode code flow

... using the pipe masks from the previous patch.

Well, not quite:
- We still need to call the disable_unused_functions helper, until
  we've moved the call to commit_output_state further down and
  adjusted intel_crtc_disable a bit. The next patch will do that.
- Because we don't support (yet) mode changes on more than one crtc at
  a time, some of the modeset_pipes checks are a bit hackish - but
  that only needs fixing once we incorporate global modeset support.
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -6798,6 +6798,12 @@ intel_modeset_affected_pipes(struct drm_crtc *crtc, unsigned *modeset_pipes,
 	*prepare_pipes &= ~(*disable_pipes);
 }
 
+#define for_each_intel_crtc_masked(dev, mask, intel_crtc) \
+	list_for_each_entry((intel_crtc), \
+			    &(dev)->mode_config.crtc_list, \
+			    base.head) \
+		if (mask & (1 <<(intel_crtc)->pipe)) \
+
 bool intel_set_mode(struct drm_crtc *crtc,
 		    struct drm_display_mode *mode,
 		    int x, int y, struct drm_framebuffer *fb)
@@ -6807,45 +6813,63 @@ bool intel_set_mode(struct drm_crtc *crtc,
 	struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
 	struct drm_encoder_helper_funcs *encoder_funcs;
 	struct drm_encoder *encoder;
-	unsigned disable_pipe, prepare_pipes, modeset_pipes;
+	struct intel_crtc *intel_crtc;
+	unsigned disable_pipes, prepare_pipes, modeset_pipes;
 	bool ret = true;
 
 	intel_modeset_affected_pipes(crtc, &modeset_pipes,
-				     &prepare_pipes, &disable_pipe);
+				     &prepare_pipes, &disable_pipes);
+
+	DRM_DEBUG_KMS("set mode pipe masks: modeset: %x, prepare: %x, disable: %x\n",
+		      modeset_pipes, prepare_pipes, disable_pipes);
 
 	intel_modeset_commit_output_state(dev);
 
 	crtc->enabled = drm_helper_crtc_in_use(crtc);
-	if (!crtc->enabled) {
-		drm_helper_disable_unused_functions(dev);
-		return true;
-	}
 
+	for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
+		drm_helper_disable_unused_functions(dev);
 
 	saved_hwmode = crtc->hwmode;
 	saved_mode = crtc->mode;
 
+	/* Hack: Because we don't (yet) support global modeset on multiple
+	 * crtcs, we don't keep track of the new mode for more than one crtc.
+	 * Hence simply check whether any bit is set in modeset_pipes in all the
+	 * pieces of code that are not yet converted to deal with mutliple crtcs
+	 * changing their mode at the same time. */
+	adjusted_mode = NULL;
+	if (modeset_pipes) {
 		adjusted_mode = intel_modeset_adjusted_mode(crtc, mode);
 		if (IS_ERR(adjusted_mode)) {
 			return false;
 		}
 
 		intel_crtc_prepare_encoders(dev);
+	}
 
-	dev_priv->display.crtc_disable(crtc);
+	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc)
+		dev_priv->display.crtc_disable(&intel_crtc->base);
 
+	if (modeset_pipes) {
 		crtc->mode = *mode;
+		crtc->x = x;
+		crtc->y = y;
+	}
 
 	/* Set up the DPLL and any encoders state that needs to adjust or depend
 	 * on the DPLL.
 	 */
-	ret = !intel_crtc_mode_set(crtc, mode, adjusted_mode, x, y, fb);
+	for_each_intel_crtc_masked(dev, modeset_pipes, intel_crtc) {
+		ret = !intel_crtc_mode_set(&intel_crtc->base,
+					   mode, adjusted_mode,
+					   x, y, fb);
 		if (!ret)
 		    goto done;
 
 		list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 
-		if (encoder->crtc != crtc)
+			if (encoder->crtc != &intel_crtc->base)
 				continue;
 
 			DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
@@ -6854,13 +6878,13 @@ bool intel_set_mode(struct drm_crtc *crtc,
 			encoder_funcs = encoder->helper_private;
 			encoder_funcs->mode_set(encoder, mode, adjusted_mode);
 		}
-
-	crtc->x = x;
-	crtc->y = y;
+	}
 
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
-	dev_priv->display.crtc_enable(crtc);
+	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc)
+		dev_priv->display.crtc_enable(&intel_crtc->base);
 
+	if (modeset_pipes) {
 		/* Store real post-adjustment hardware mode. */
 		crtc->hwmode = *adjusted_mode;
 
@@ -6869,11 +6893,12 @@ bool intel_set_mode(struct drm_crtc *crtc,
 		 * timestamping. They are derived from true hwmode.
 		 */
 		drm_calc_timestamping_constants(crtc);
+	}
 
 	/* FIXME: add subpixel order */
 done:
 	drm_mode_destroy(dev, adjusted_mode);
-	if (!ret) {
+	if (!ret && crtc->enabled) {
 		crtc->hwmode = saved_hwmode;
 		crtc->mode = saved_mode;
 	}
@@ -6881,6 +6906,8 @@ bool intel_set_mode(struct drm_crtc *crtc,
 	return ret;
 }
 
+#undef for_each_intel_crtc_masked
+
 static void intel_set_config_free(struct intel_set_config *config)
 {
 	if (!config)