drm/i915/dp: Compute DP tunnel BW during encoder state computation

Compute the BW required through a DP tunnel on links with such tunnels
detected and add the corresponding atomic state during a modeset.

v2:
- Fix error check of intel_dp_tunnel_compute_stream_bw(). (Ville)
- Move intel_dp_tunnel_atomic_cleanup_inherited_state() to this patch.
  (Ville)
- Move intel_dp_tunnel_atomic_clear_stream_bw() to this patch.

Reviewed-by: Uma Shankar <uma.shankar@intel.com> (v1)
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220211841.448846-16-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_atomic.c

@@ -352,6 +352,8 @@ void intel_atomic_state_clear(struct drm_atomic_state *s)
 	/* state->internal not reset on purpose */
 
 	state->dpll_set = state->modeset = false;
+
+	intel_dp_tunnel_atomic_cleanup_inherited_state(state);
 }
 
 struct intel_crtc_state *

drivers/gpu/drm/i915/display/intel_display.c

@@ -4541,6 +4541,8 @@ intel_crtc_prepare_cleared_state(struct intel_atomic_state *state,
 	/* free the old crtc_state->hw members */
 	intel_crtc_free_hw_state(crtc_state);
 
+	intel_dp_tunnel_atomic_clear_stream_bw(state, crtc_state);
+
 	/* FIXME: before the switch to atomic started, a new pipe_config was
 	 * kzalloc'd. Code that depends on any field being zero should be
 	 * fixed, so that the crtc_state can be safely duplicated. For now,

drivers/gpu/drm/i915/display/intel_dp.c

@@ -2875,6 +2875,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 			struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
 	struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 	const struct drm_display_mode *fixed_mode;
@@ -2975,7 +2976,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
 	intel_dp_compute_hdr_metadata_infoframe_sdp(intel_dp, pipe_config, conn_state);
 
-	return 0;
+	return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
+							pipe_config);
 }
 
 void intel_dp_set_link_params(struct intel_dp *intel_dp,
@@ -6066,6 +6068,15 @@ static int intel_dp_connector_atomic_check(struct drm_connector *conn,
 			return ret;
 	}
 
+	if (!intel_connector_needs_modeset(state, conn))
+		return 0;
+
+	ret = intel_dp_tunnel_atomic_check_state(state,
+						 intel_dp,
+						 intel_conn);
+	if (ret)
+		return ret;
+
 	/*
 	 * We don't enable port sync on BDW due to missing w/as and
 	 * due to not having adjusted the modeset sequence appropriately.
@@ -6073,9 +6084,6 @@ static int intel_dp_connector_atomic_check(struct drm_connector *conn,
 	if (DISPLAY_VER(dev_priv) < 9)
 		return 0;
 
-	if (!intel_connector_needs_modeset(state, conn))
-		return 0;
-
 	if (conn->has_tile) {
 		ret = intel_modeset_tile_group(state, conn->tile_group->id);
 		if (ret)

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -42,6 +42,7 @@
 #include "intel_dp.h"
 #include "intel_dp_hdcp.h"
 #include "intel_dp_mst.h"
+#include "intel_dp_tunnel.h"
 #include "intel_dpio_phy.h"
 #include "intel_hdcp.h"
 #include "intel_hotplug.h"
@@ -523,6 +524,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 				       struct drm_connector_state *conn_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 	struct intel_dp *intel_dp = &intel_mst->primary->dp;
 	const struct intel_connector *connector =
@@ -619,7 +621,8 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 
 	intel_psr_compute_config(intel_dp, pipe_config, conn_state);
 
-	return 0;
+	return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
+							pipe_config);
 }
 
 /*
@@ -876,6 +879,14 @@ intel_dp_mst_atomic_check(struct drm_connector *connector,
 	if (ret)
 		return ret;
 
+	if (intel_connector_needs_modeset(state, connector)) {
+		ret = intel_dp_tunnel_atomic_check_state(state,
+							 intel_connector->mst_port,
+							 intel_connector);
+		if (ret)
+			return ret;
+	}
+
 	return drm_dp_atomic_release_time_slots(&state->base,
 						&intel_connector->mst_port->mst_mgr,
 						intel_connector->port);