drm/amd/display: Initialise encoder assignment when initialising dc_state

[Why]
Link encoder assignment tracking variables need to be (re)initialised
whenever dc_state is (re)initialised. Otherwise variables used for
dynamic encoder assignment (especially the link encoder availability
pool) are out of sync with dc_state and future encoder assignments are
invalid.

[How]
Initialise encoder assignment variables when creating new dc_state
resource.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -1016,8 +1016,6 @@ static bool dc_construct(struct dc *dc,
 		goto fail;
 	}
 
-	dc_resource_state_construct(dc, dc->current_state);
-
 	if (!create_links(dc, init_params->num_virtual_links))
 		goto fail;
 
@@ -1027,8 +1025,7 @@ static bool dc_construct(struct dc *dc,
 	if (!create_link_encoders(dc))
 		goto fail;
 
-	/* Initialise DIG link encoder resource tracking variables. */
-	link_enc_cfg_init(dc, dc->current_state);
+	dc_resource_state_construct(dc, dc->current_state);
 
 	return true;
 

drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c

@@ -242,7 +242,7 @@ static struct link_encoder *get_link_enc_used_by_link(
 	return link_enc;
 }
 /* Clear all link encoder assignments. */
-static void clear_enc_assignments(struct dc *dc, struct dc_state *state)
+static void clear_enc_assignments(const struct dc *dc, struct dc_state *state)
 {
 	int i;
 
@@ -261,7 +261,7 @@ static void clear_enc_assignments(struct dc *dc, struct dc_state *state)
 }
 
 void link_enc_cfg_init(
-		struct dc *dc,
+		const struct dc *dc,
 		struct dc_state *state)
 {
 	clear_enc_assignments(dc, state);

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -2224,6 +2224,9 @@ void dc_resource_state_construct(
 		struct dc_state *dst_ctx)
 {
 	dst_ctx->clk_mgr = dc->clk_mgr;
+
+	/* Initialise DIG link encoder resource tracking variables. */
+	link_enc_cfg_init(dc, dst_ctx);
 }
 
 

drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h

@@ -36,7 +36,7 @@
  * Initialise link encoder resource tracking.
  */
 void link_enc_cfg_init(
-		struct dc *dc,
+		const struct dc *dc,
 		struct dc_state *state);
 
 /*