drm/amd/display: Add DP 2.0 HPO Link Encoder

HW Blocks:

        +--------+  +-----+  +------+
        |  OPTC  |  | HDA |  | HUBP |
        +--------+  +-----+  +------+
            |          |        |
            |          |        |
    HPO ====|==========|========|====
     |      |          v        |
     |      |       +-----+     |
     |      |       | APG |     |
     |      |       +-----+     |
     |      |          |        |
     |      v          v        v
     |     +---------------------+
     |     |  HPO Stream Encoder |
     |     +---------------------+
     |                 |
     |                 v
     |      +--------------------+
     |      |  HPO Link Encoder  |
     v      +--------------------+

[squash in warning fixes - Alex]

Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

4 files changed, 95 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 19dbfc8a44bb..ed254c2771f0 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -249,6 +249,8 @@ struct resource_pool {
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	unsigned int hpo_dp_stream_enc_count;
 	struct hpo_dp_stream_encoder *hpo_dp_stream_enc[MAX_HPO_DP2_ENCODERS];
+	unsigned int hpo_dp_link_enc_count;
+	struct hpo_dp_link_encoder *hpo_dp_link_enc[MAX_HPO_DP2_LINK_ENCODERS];
 #endif
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	struct dc_3dlut *mpc_lut[MAX_PIPES];
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h b/drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h
index ad9e9e2d52b0..10ecbc667ffa 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h
@@ -40,6 +40,7 @@
 #define MAX_DWB_PIPES	1
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 #define MAX_HPO_DP2_ENCODERS	4
+#define MAX_HPO_DP2_LINK_ENCODERS	2
 #endif
 
 struct gamma_curve {
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
index 9eaf345aa2a1..fa3a725e11dc 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
@@ -210,4 +210,91 @@ struct link_enc_assignment {
 	enum engine_id eng_id;
 };
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+enum dp2_link_mode {
+	DP2_LINK_TRAINING_TPS1,
+	DP2_LINK_TRAINING_TPS2,
+	DP2_LINK_ACTIVE,
+	DP2_TEST_PATTERN
+};
+
+enum dp2_phy_tp_select {
+	DP_DPHY_TP_SELECT_TPS1,
+	DP_DPHY_TP_SELECT_TPS2,
+	DP_DPHY_TP_SELECT_PRBS,
+	DP_DPHY_TP_SELECT_CUSTOM,
+	DP_DPHY_TP_SELECT_SQUARE
+};
+
+enum dp2_phy_tp_prbs {
+	DP_DPHY_TP_PRBS7,
+	DP_DPHY_TP_PRBS9,
+	DP_DPHY_TP_PRBS11,
+	DP_DPHY_TP_PRBS15,
+	DP_DPHY_TP_PRBS23,
+	DP_DPHY_TP_PRBS31
+};
+
+struct hpo_dp_link_enc_state {
+	uint32_t   link_enc_enabled;
+	uint32_t   link_mode;
+	uint32_t   lane_count;
+	uint32_t   slot_count[4];
+	uint32_t   stream_src[4];
+	uint32_t   vc_rate_x[4];
+	uint32_t   vc_rate_y[4];
+};
+
+struct hpo_dp_link_encoder {
+	const struct hpo_dp_link_encoder_funcs *funcs;
+	struct dc_context *ctx;
+	int inst;
+	enum engine_id preferred_engine;
+	enum transmitter transmitter;
+	enum hpd_source_id hpd_source;
+};
+
+struct hpo_dp_link_encoder_funcs {
+
+	void (*enable_link_phy)(struct hpo_dp_link_encoder *enc,
+		const struct dc_link_settings *link_settings,
+		enum transmitter transmitter);
+
+	void (*disable_link_phy)(struct hpo_dp_link_encoder *link_enc,
+		enum signal_type signal);
+
+	void (*link_enable)(
+			struct hpo_dp_link_encoder *enc,
+			enum dc_lane_count num_lanes);
+
+	void (*link_disable)(
+			struct hpo_dp_link_encoder *enc);
+
+	void (*set_link_test_pattern)(
+			struct hpo_dp_link_encoder *enc,
+			struct encoder_set_dp_phy_pattern_param *tp_params);
+
+	void (*update_stream_allocation_table)(
+			struct hpo_dp_link_encoder *enc,
+			const struct link_mst_stream_allocation_table *table);
+
+	void (*set_throttled_vcp_size)(
+			struct hpo_dp_link_encoder *enc,
+			uint32_t stream_encoder_inst,
+			struct fixed31_32 avg_time_slots_per_mtp);
+
+	bool (*is_in_alt_mode) (
+			struct hpo_dp_link_encoder *enc);
+
+	void (*read_state)(
+			struct hpo_dp_link_encoder *enc,
+			struct hpo_dp_link_enc_state *state);
+
+	void (*set_ffe)(
+		struct hpo_dp_link_encoder *enc,
+		const struct dc_link_settings *link_settings,
+		uint8_t ffe_preset);
+};
+#endif
+
 #endif /* LINK_ENCODER_H_ */
diff --git a/drivers/gpu/drm/amd/display/dc/inc/resource.h b/drivers/gpu/drm/amd/display/dc/inc/resource.h
index 5a2cfc899044..713f6d5cf3e0 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/resource.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/resource.h
@@ -51,6 +51,7 @@ struct resource_caps {
 	unsigned int num_dig_link_enc; // Total number of DIGs (digital encoders) in DIO (Display Input/Output).
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	int num_hpo_dp_stream_encoder;
+	int num_hpo_dp_link_encoder;
 #endif
 	int num_mpc_3dlut;
 };
@@ -74,6 +75,10 @@ struct resource_create_funcs {
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 	struct hpo_dp_stream_encoder *(*create_hpo_dp_stream_encoder)(
 			enum engine_id eng_id, struct dc_context *ctx);
+
+	struct hpo_dp_link_encoder *(*create_hpo_dp_link_encoder)(
+			uint8_t inst,
+			struct dc_context *ctx);
 #endif
 
 	struct dce_hwseq *(*create_hwseq)(