drm/i915: Swap atomic state in legacy modeset

Replace the commit output state function with a simple swap of states.
Note that we still need to reconcile the legacy state after the swap,
since there are still code that relies on those.

Also note that even though changes to the state of a crtc different than
the one passed as an argument to __intel_set_mode() will be saved, the
modeset logic still deals with only one crtc.
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -5728,16 +5728,21 @@ static int broxton_calc_cdclk(struct drm_i915_private *dev_priv,
 		return 144000;
 }
 
-/* compute the max pixel clock for new configuration */
-static int intel_mode_max_pixclk(struct drm_atomic_state *state)
+/* Compute the max pixel clock for new configuration. Uses atomic state if
+ * that's non-NULL, look at current state otherwise. */
+static int intel_mode_max_pixclk(struct drm_device *dev,
+				 struct drm_atomic_state *state)
 {
-	struct drm_device *dev = state->dev;
 	struct intel_crtc *intel_crtc;
 	struct intel_crtc_state *crtc_state;
 	int max_pixclk = 0;
 
 	for_each_intel_crtc(dev, intel_crtc) {
-		crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
+		if (state)
+			crtc_state =
+				intel_atomic_get_crtc_state(state, intel_crtc);
+		else
+			crtc_state = intel_crtc->config;
 		if (IS_ERR(crtc_state))
 			return PTR_ERR(crtc_state);
 
@@ -5756,7 +5761,7 @@ static int valleyview_modeset_global_pipes(struct drm_atomic_state *state)
 	struct drm_i915_private *dev_priv = to_i915(state->dev);
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
-	int max_pixclk = intel_mode_max_pixclk(state);
+	int max_pixclk = intel_mode_max_pixclk(state->dev, state);
 	int cdclk, i;
 
 	if (max_pixclk < 0)
@@ -5824,18 +5829,15 @@ static void vlv_program_pfi_credits(struct drm_i915_private *dev_priv)
 	WARN_ON(I915_READ(GCI_CONTROL) & PFI_CREDIT_RESEND);
 }
 
-static void valleyview_modeset_global_resources(struct drm_atomic_state *state)
+static void valleyview_modeset_global_resources(struct drm_atomic_state *old_state)
 {
-	struct drm_device *dev = state->dev;
+	struct drm_device *dev = old_state->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	int max_pixclk = intel_mode_max_pixclk(state);
+	int max_pixclk = intel_mode_max_pixclk(dev, NULL);
 	int req_cdclk;
 
-	/* The only reason this can fail is if we fail to add the crtc_state
-	 * to the atomic state. But that can't happen since the call to
-	 * intel_mode_max_pixclk() in valleyview_modeset_global_pipes() (which
-	 * can't have failed otherwise the mode set would be aborted) added all
-	 * the states already. */
+	/* The path in intel_mode_max_pixclk() with a NULL atomic state should
+	 * never fail. */
 	if (WARN_ON(max_pixclk < 0))
 		return;
 
@@ -9154,11 +9156,11 @@ void hsw_disable_pc8(struct drm_i915_private *dev_priv)
 	intel_prepare_ddi(dev);
 }
 
-static void broxton_modeset_global_resources(struct drm_atomic_state *state)
+static void broxton_modeset_global_resources(struct drm_atomic_state *old_state)
 {
-	struct drm_device *dev = state->dev;
+	struct drm_device *dev = old_state->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	int max_pixclk = intel_mode_max_pixclk(state);
+	int max_pixclk = intel_mode_max_pixclk(dev, NULL);
 	int req_cdclk;
 
 	/* see the comment in valleyview_modeset_global_resources */
@@ -11152,46 +11154,36 @@ static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
 	}
 }
 
-/**
- * intel_modeset_commit_output_state
- *
- * This function copies the stage display pipe configuration to the real one.
- *
- * FIXME: we want to replace this with a proper state swap in the future
+/* Fixup legacy state after an atomic state swap.
  */
-static void intel_modeset_commit_output_state(struct drm_atomic_state *state)
+static void intel_modeset_fixup_state(struct drm_atomic_state *state)
 {
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *crtc_state;
-	struct drm_connector *connector;
-	struct drm_connector_state *connector_state;
+	struct intel_crtc *crtc;
 	struct intel_encoder *encoder;
-	struct intel_connector *intel_connector;
-	int i;
-
-	for_each_connector_in_state(state, connector, connector_state, i) {
-		*connector->state = *connector_state;
+	struct intel_connector *connector;
 
-		connector->encoder = connector_state->best_encoder;
-		if (connector->encoder)
-			connector->encoder->crtc = connector_state->crtc;
+	for_each_intel_connector(state->dev, connector) {
+		connector->base.encoder = connector->base.state->best_encoder;
+		if (connector->base.encoder)
+			connector->base.encoder->crtc =
+				connector->base.state->crtc;
 	}
 
 	/* Update crtc of disabled encoders */
 	for_each_intel_encoder(state->dev, encoder) {
 		int num_connectors = 0;
 
-		for_each_intel_connector(state->dev, intel_connector)
-			if (intel_connector->base.encoder == &encoder->base)
+		for_each_intel_connector(state->dev, connector)
+			if (connector->base.encoder == &encoder->base)
 				num_connectors++;
 
 		if (num_connectors == 0)
 			encoder->base.crtc = NULL;
 	}
 
-	for_each_crtc_in_state(state, crtc, crtc_state, i) {
-		crtc->state->enable = crtc_state->enable;
-		crtc->enabled = crtc_state->enable;
+	for_each_intel_crtc(state->dev, crtc) {
+		crtc->base.enabled = crtc->base.state->enable;
+		crtc->config = to_intel_crtc_state(crtc->base.state);
 	}
 
 	/* Copy the new configuration to the staged state, to keep the few
@@ -11648,7 +11640,8 @@ intel_modeset_update_state(struct drm_atomic_state *state)
 			intel_encoder->connectors_active = false;
 	}
 
-	intel_modeset_commit_output_state(state);
+	drm_atomic_helper_swap_state(state->dev, state);
+	intel_modeset_fixup_state(state);
 
 	/* Double check state. */
 	for_each_crtc(dev, crtc) {
@@ -11666,7 +11659,7 @@ intel_modeset_update_state(struct drm_atomic_state *state)
 		if (crtc != connector->encoder->crtc)
 			continue;
 
-		if (crtc_state->enable && needs_modeset(crtc_state)) {
+		if (crtc->state->enable && needs_modeset(crtc->state)) {
 			struct drm_property *dpms_property =
 				dev->mode_config.dpms_property;
 
@@ -12332,31 +12325,12 @@ static int __intel_set_mode_checks(struct drm_atomic_state *state)
 	return 0;
 }
 
-static void __intel_set_mode_swap_plane_state(struct drm_device *dev,
-					      struct drm_atomic_state *state)
-{
-	int i;
-
-	for (i = 0; i < dev->mode_config.num_total_plane; i++) {
-		struct drm_plane *plane = state->planes[i];
-
-		if (!plane)
-			continue;
-
-		plane->state->state = state;
-		swap(state->plane_states[i], plane->state);
-		plane->state->state = NULL;
-	}
-}
-
 static int __intel_set_mode(struct drm_crtc *modeset_crtc,
 			    struct intel_crtc_state *pipe_config)
 {
 	struct drm_device *dev = modeset_crtc->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_atomic_state *state = pipe_config->base.state;
-	struct intel_crtc_state *crtc_state_copy = NULL;
-	struct intel_crtc *intel_crtc;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
 	int ret = 0;
@@ -12370,10 +12344,6 @@ static int __intel_set_mode(struct drm_crtc *modeset_crtc,
 	if (ret)
 		return ret;
 
-	crtc_state_copy = kmalloc(sizeof(*crtc_state_copy), GFP_KERNEL);
-	if (!crtc_state_copy)
-		return -ENOMEM;
-
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
 		if (!needs_modeset(crtc_state))
 			continue;
@@ -12395,9 +12365,6 @@ static int __intel_set_mode(struct drm_crtc *modeset_crtc,
 	 */
 	if (pipe_config->base.enable && needs_modeset(&pipe_config->base)) {
 		modeset_crtc->mode = pipe_config->base.mode;
-		/* mode_set/enable/disable functions rely on a correct pipe
-		 * config. */
-		intel_crtc_set_state(to_intel_crtc(modeset_crtc), pipe_config);
 
 		/*
 		 * Calculate and store various constants which
@@ -12412,14 +12379,16 @@ static int __intel_set_mode(struct drm_crtc *modeset_crtc,
 	 * update the the output configuration. */
 	intel_modeset_update_state(state);
 
+	/* The state has been swaped above, so state actually contains the
+	 * old state now. */
+
 	modeset_update_crtc_power_domains(state);
 
-	__intel_set_mode_swap_plane_state(dev, state);
 	drm_atomic_helper_commit_planes(dev, state);
 
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
-		if (!needs_modeset(crtc_state) || !crtc_state->enable)
+		if (!needs_modeset(crtc->state) || !crtc->state->enable)
 			continue;
 
 		update_scanline_offset(to_intel_crtc(crtc));
@@ -12430,14 +12399,6 @@ static int __intel_set_mode(struct drm_crtc *modeset_crtc,
 
 	/* FIXME: add subpixel order */
 
-	intel_crtc = to_intel_crtc(modeset_crtc);
-
-	/* The pipe_config will be freed with the atomic state, so
-	 * make a copy. */
-	memcpy(crtc_state_copy, intel_crtc->config, sizeof *crtc_state_copy);
-	intel_crtc->config = crtc_state_copy;
-	intel_crtc->base.state = &crtc_state_copy->base;
-
 	drm_atomic_helper_cleanup_planes(dev, state);
 
 	drm_atomic_state_free(state);