[PATCH 03/20] drm/amd/display: Introduce MAX_LINK_ENCODERS

[Timur Kristóf]

We are going to support analog encoders as well, not just digital,
so we need to make space for them in various arrays.

Signed-off-by: Timur Kristóf <timur.kristof at gmail.com>
---
 .../drm/amd/display/dc/core/dc_link_enc_cfg.c |  4 ++--
 .../gpu/drm/amd/display/dc/inc/core_types.h   |  8 +++----
 .../gpu/drm/amd/display/dc/inc/hw/hw_shared.h | 24 +++++++++++++++++++
 3 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c
index 814f68d76257..d86482611b3f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c
@@ -522,10 +522,10 @@ struct link_encoder *link_enc_cfg_get_link_enc_used_by_link(
 struct link_encoder *link_enc_cfg_get_next_avail_link_enc(struct dc *dc)
 {
 	struct link_encoder *link_enc = NULL;
-	enum engine_id encs_assigned[MAX_DIG_LINK_ENCODERS];
+	enum engine_id encs_assigned[MAX_LINK_ENCODERS];
 	int i;
 
-	for (i = 0; i < MAX_DIG_LINK_ENCODERS; i++)
+	for (i = 0; i < MAX_LINK_ENCODERS; i++)
 		encs_assigned[i] = ENGINE_ID_UNKNOWN;
 
 	/* Add assigned encoders to list. */
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 f0d7185153b2..55daf348293e 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/core_types.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/core_types.h
@@ -274,7 +274,7 @@ struct resource_pool {
 	/* An array for accessing the link encoder objects that have been created.
 	 * Index in array corresponds to engine ID - viz. 0: ENGINE_ID_DIGA
 	 */
-	struct link_encoder *link_encoders[MAX_DIG_LINK_ENCODERS];
+	struct link_encoder *link_encoders[MAX_LINK_ENCODERS];
 	/* Number of DIG link encoder objects created - i.e. number of valid
 	 * entries in link_encoders array.
 	 */
@@ -508,7 +508,7 @@ struct pipe_ctx {
 struct link_enc_cfg_context {
 	enum link_enc_cfg_mode mode;
 	struct link_enc_assignment link_enc_assignments[MAX_PIPES];
-	enum engine_id link_enc_avail[MAX_DIG_LINK_ENCODERS];
+	enum engine_id link_enc_avail[MAX_LINK_ENCODERS];
 	struct link_enc_assignment transient_assignments[MAX_PIPES];
 };
 
@@ -520,8 +520,8 @@ struct resource_context {
 	uint8_t dp_clock_source_ref_count;
 	bool is_dsc_acquired[MAX_PIPES];
 	struct link_enc_cfg_context link_enc_cfg_ctx;
-	unsigned int dio_link_enc_to_link_idx[MAX_DIG_LINK_ENCODERS];
-	int dio_link_enc_ref_cnts[MAX_DIG_LINK_ENCODERS];
+	unsigned int dio_link_enc_to_link_idx[MAX_LINK_ENCODERS];
+	int dio_link_enc_ref_cnts[MAX_LINK_ENCODERS];
 	bool is_hpo_dp_stream_enc_acquired[MAX_HPO_DP2_ENCODERS];
 	unsigned int hpo_dp_link_enc_to_link_idx[MAX_HPO_DP2_LINK_ENCODERS];
 	int hpo_dp_link_enc_ref_cnts[MAX_HPO_DP2_LINK_ENCODERS];
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 41c76ba9ba56..dc9b9f22c75b 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
@@ -45,7 +45,31 @@
 #define MAX_PIPES 6
 #define MAX_PHANTOM_PIPES (MAX_PIPES / 2)
 #define MAX_LINKS (MAX_PIPES * 2 +2)
+
+/**
+ * define MAX_DIG_LINK_ENCODERS - maximum number of digital encoders
+ *
+ * Digital encoders are ENGINE_ID_DIGA...G, there are at most 7,
+ * although not every GPU may have that many.
+ */
 #define MAX_DIG_LINK_ENCODERS 7
+
+/**
+ * define MAX_DIG_LINK_ENCODERS - maximum number of analog link encoders
+ *
+ * Analog encoders are ENGINE_ID_DACA/B, there are at most 2,
+ * although not every GPU may have that many. Modern GPUs typically
+ * don't have analog encoders.
+ */
+#define MAX_DAC_LINK_ENCODERS 2
+
+/**
+ * define MAX_LINK_ENCODERS - maximum number link encoders in total
+ *
+ * This includes both analog and digital encoders.
+ */
+#define MAX_LINK_ENCODERS (MAX_DIG_LINK_ENCODERS + MAX_DAC_LINK_ENCODERS)
+
 #define MAX_DWB_PIPES	1
 #define MAX_HPO_DP2_ENCODERS	4
 #define MAX_HPO_DP2_LINK_ENCODERS	4
-- 
2.50.1