drm/amd/display: Add dynamic link encoder selection.

[Why]
Some display endpoints may be programmably mapped to compatible link
encoders. The assignment of link encoders to links has to be dynamic to
accommodate the increased flexibility in comparison to conventional
display endpoints.

[How]
- Add link encoder assignment tracking variables.
- Execute link encoder assignment algorithm before enabling link and
release link encoders from links once they are disabled.

Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/core_types.h b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
index eb1a19bf0d81..81b92f20d5b6 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -118,6 +118,27 @@ struct resource_funcs {
 		display_e2e_pipe_params_st *pipes,
 		bool fast_validate);
 
+	/*
+	 * Algorithm for assigning available link encoders to links.
+	 *
+	 * Update link_enc_assignments table and link_enc_avail list accordingly in
+	 * struct resource_context.
+	 */
+	void (*link_encs_assign)(
+			struct dc *dc,
+			struct dc_state *state,
+			struct dc_stream_state *streams[],
+			uint8_t stream_count);
+	/*
+	 * Unassign a link encoder from a stream.
+	 *
+	 * Update link_enc_assignments table and link_enc_avail list accordingly in
+	 * struct resource_context.
+	 */
+	void (*link_enc_unassign)(
+			struct dc_state *state,
+			struct dc_stream_state *stream);
+
 	enum dc_status (*validate_global)(
 		struct dc *dc,
 		struct dc_state *context);
@@ -358,6 +379,12 @@ struct resource_context {
 	uint8_t clock_source_ref_count[MAX_CLOCK_SOURCES];
 	uint8_t dp_clock_source_ref_count;
 	bool is_dsc_acquired[MAX_PIPES];
+	/* A table/array of encoder-to-link assignments. One entry per stream.
+	 * Indexed by stream index in dc_state.
+	 */
+	struct link_enc_assignment link_enc_assignments[MAX_PIPES];
+	/* List of available link encoders. Uses engine ID as encoder identifier. */
+	enum engine_id link_enc_avail[MAX_DIG_LINK_ENCODERS];
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	bool is_mpc_3dlut_acquired[MAX_PIPES];
 #endif