drm/i915/dp: Add DP tunnel atomic state and check BW limit

Add the atomic state during a modeset required to enable the DP tunnel
BW allocation mode on links where such a tunnel was detected. This state
applies to an already enabled output, the state added for a newly
enabled output will be computed and added/cleared to/from the atomic
state in a follow-up patch.

v2:
- s/old_crtc_state/crtc_state in intel_crtc_duplicate_state().
- Move intel_dp_tunnel_atomic_cleanup_inherited_state() to a follow-up
  patch adding the corresponding state. (Ville)
- Move intel_dp_tunnel_atomic_clear_stream_bw() to a follow-up
  patch adding the corresponding state.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
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/20240220211841.448846-14-imre.deak@intel.com

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

@@ -260,6 +260,10 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
 	if (crtc_state->post_csc_lut)
 		drm_property_blob_get(crtc_state->post_csc_lut);
 
+	if (crtc_state->dp_tunnel_ref.tunnel)
+		drm_dp_tunnel_ref_get(crtc_state->dp_tunnel_ref.tunnel,
+				      &crtc_state->dp_tunnel_ref);
+
 	crtc_state->update_pipe = false;
 	crtc_state->update_m_n = false;
 	crtc_state->update_lrr = false;
@@ -311,6 +315,8 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
 
 	__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
 	intel_crtc_free_hw_state(crtc_state);
+	if (crtc_state->dp_tunnel_ref.tunnel)
+		drm_dp_tunnel_ref_put(&crtc_state->dp_tunnel_ref);
 	kfree(crtc_state);
 }
 

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

@@ -33,6 +33,7 @@
 #include <linux/string_helpers.h>
 
 #include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_dp_tunnel.h>
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_atomic_uapi.h>
@@ -73,6 +74,7 @@
 #include "intel_dp.h"
 #include "intel_dp_link_training.h"
 #include "intel_dp_mst.h"
+#include "intel_dp_tunnel.h"
 #include "intel_dpll.h"
 #include "intel_dpll_mgr.h"
 #include "intel_dpt.h"
@@ -4490,6 +4492,8 @@ copy_bigjoiner_crtc_state_modeset(struct intel_atomic_state *state,
 	saved_state->crc_enabled = slave_crtc_state->crc_enabled;
 
 	intel_crtc_free_hw_state(slave_crtc_state);
+	if (slave_crtc_state->dp_tunnel_ref.tunnel)
+		drm_dp_tunnel_ref_put(&slave_crtc_state->dp_tunnel_ref);
 	memcpy(slave_crtc_state, saved_state, sizeof(*slave_crtc_state));
 	kfree(saved_state);
 
@@ -4505,6 +4509,10 @@ copy_bigjoiner_crtc_state_modeset(struct intel_atomic_state *state,
 		      &master_crtc_state->hw.adjusted_mode);
 	slave_crtc_state->hw.scaling_filter = master_crtc_state->hw.scaling_filter;
 
+	if (master_crtc_state->dp_tunnel_ref.tunnel)
+		drm_dp_tunnel_ref_get(master_crtc_state->dp_tunnel_ref.tunnel,
+				      &slave_crtc_state->dp_tunnel_ref);
+
 	copy_bigjoiner_crtc_state_nomodeset(state, slave_crtc);
 
 	slave_crtc_state->uapi.mode_changed = master_crtc_state->uapi.mode_changed;
@@ -5366,6 +5374,10 @@ static int intel_modeset_pipe(struct intel_atomic_state *state,
 	if (ret)
 		return ret;
 
+	ret = intel_dp_tunnel_atomic_add_state_for_crtc(state, crtc);
+	if (ret)
+		return ret;
+
 	ret = intel_dp_mst_add_topology_state_for_crtc(state, crtc);
 	if (ret)
 		return ret;

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

@@ -9,6 +9,7 @@
 #include "intel_crtc.h"
 #include "intel_display_types.h"
 #include "intel_dp_mst.h"
+#include "intel_dp_tunnel.h"
 #include "intel_fdi.h"
 #include "intel_link_bw.h"
 
@@ -163,6 +164,10 @@ static int check_all_link_config(struct intel_atomic_state *state,
 	if (ret)
 		return ret;
 
+	ret = intel_dp_tunnel_atomic_check_link(state, limits);
+	if (ret)
+		return ret;
+
 	ret = intel_fdi_atomic_check_link(state, limits);
 	if (ret)
 		return ret;