drm/i915/dp: Allocate/free DP tunnel BW during modeset

Allocate and free the DP tunnel BW required by a stream while
enabling/disabling the stream during a modeset.

v2:
- Move the allocation up from encoder hooks to
  intel_atomic_commit_tail().
v3:
- Update the commit subject. (Ville)

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/20240220211841.448846-17-imre.deak@intel.com

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

@@ -54,6 +54,7 @@
 #include "intel_dp_aux.h"
 #include "intel_dp_link_training.h"
 #include "intel_dp_mst.h"
+#include "intel_dp_tunnel.h"
 #include "intel_dpio_phy.h"
 #include "intel_dsi.h"
 #include "intel_fdi.h"

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

@@ -7124,6 +7124,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 
 	intel_commit_modeset_disables(state);
 
+	intel_dp_tunnel_atomic_alloc_bw(state);
+
 	/* FIXME: Eventually get rid of our crtc->config pointer */
 	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
 		crtc->config = new_crtc_state;