drm/amd/display: Set Pipe Unlock Order Outside of HWSEQ

[Why]
Current pipe unlock order set within dcn401_interdependent_update_lock.
Separate the logic from the functionality to allow for unit testing
and make it easier to debug.

[How]
Add a flag to indicate if a pipe unlock order should be set.
Create function to determine unlock order.
Indicate which pipes should be unlocked first using
array stored in dc scratch memory.
Pipes indicated in array can be unlocked in any order.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Austin Zheng <Austin.Zheng@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1876,6 +1876,41 @@ void dc_z10_save_init(struct dc *dc)
 		dc->hwss.z10_save_init(dc);
 }
 
+/* Set a pipe unlock order based on the change in DET allocation and stores it in dc scratch memory
+ * Prevents over allocation of DET during unlock process
+ * e.g. 2 pipe config with different streams with a max of 20 DET segments
+ *	Before:								After:
+ *		- Pipe0: 10 DET segments			- Pipe0: 12 DET segments
+ *		- Pipe1: 10 DET segments			- Pipe1: 8 DET segments
+ * If Pipe0 gets updated first, 22 DET segments will be allocated
+ */
+static void determine_pipe_unlock_order(struct dc *dc, struct dc_state *context)
+{
+	unsigned int i = 0;
+	struct pipe_ctx *pipe = NULL;
+	struct timing_generator *tg = NULL;
+
+	if (!dc->config.set_pipe_unlock_order)
+		return;
+
+	memset(dc->scratch.pipes_to_unlock_first, 0, sizeof(dc->scratch.pipes_to_unlock_first));
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		pipe = &context->res_ctx.pipe_ctx[i];
+		tg = pipe->stream_res.tg;
+
+		if (!resource_is_pipe_type(pipe, OTG_MASTER) ||
+				!tg->funcs->is_tg_enabled(tg) ||
+				dc_state_get_pipe_subvp_type(context, pipe) == SUBVP_PHANTOM) {
+			continue;
+		}
+
+		if (resource_calculate_det_for_stream(context, pipe) <
+				resource_calculate_det_for_stream(dc->current_state, &dc->current_state->res_ctx.pipe_ctx[i])) {
+			dc->scratch.pipes_to_unlock_first[i] = true;
+		}
+	}
+}
+
 /**
  * dc_commit_state_no_check - Apply context to the hardware
  *
@@ -1974,6 +2009,7 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 		context->streams[i]->update_flags.bits.dsc_changed = prev_dsc_changed;
 	}
 
+	determine_pipe_unlock_order(dc, context);
 	/* Program all planes within new context*/
 	if (dc->res_pool->funcs->prepare_mcache_programming)
 		dc->res_pool->funcs->prepare_mcache_programming(dc, context);
@@ -3625,6 +3661,10 @@ static void commit_planes_for_stream_fast(struct dc *dc,
 	struct pipe_ctx *top_pipe_to_program = NULL;
 	struct dc_stream_status *stream_status = NULL;
 	bool should_offload_fams2_flip = false;
+	bool should_lock_all_pipes = (update_type != UPDATE_TYPE_FAST);
+
+	if (should_lock_all_pipes)
+		determine_pipe_unlock_order(dc, context);
 
 	if (dc->debug.fams2_config.bits.enable &&
 			dc->debug.fams2_config.bits.enable_offload_flip &&
@@ -3743,6 +3783,8 @@ static void commit_planes_for_stream(struct dc *dc,
 	bool subvp_curr_use = false;
 	uint8_t current_stream_mask = 0;
 
+	if (should_lock_all_pipes)
+		determine_pipe_unlock_order(dc, context);
 	// Once we apply the new subvp context to hardware it won't be in the
 	// dc->current_state anymore, so we have to cache it before we apply
 	// the new SubVP context

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

@@ -463,6 +463,7 @@ struct dc_config {
 	unsigned int enable_fpo_flicker_detection;
 	bool disable_hbr_audio_dp2;
 	bool consolidated_dpia_dp_lt;
+	bool set_pipe_unlock_order;
 };
 
 enum visual_confirm {
@@ -1461,6 +1462,7 @@ struct dc {
 		struct dc_scratch_space current_state;
 		struct dc_scratch_space new_state;
 		struct dc_stream_state temp_stream; // Used so we don't need to allocate stream on the stack
+		bool pipes_to_unlock_first[MAX_PIPES]; /* Any of the pipes indicated here should be unlocked first */
 	} scratch;
 
 	struct dml2_configuration_options dml2_options;

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c

@@ -1705,7 +1705,6 @@ void dcn401_interdependent_update_lock(struct dc *dc,
 	unsigned int i = 0;
 	struct pipe_ctx *pipe = NULL;
 	struct timing_generator *tg = NULL;
-	bool pipe_unlocked[MAX_PIPES] = {0};
 
 	if (lock) {
 		for (i = 0; i < dc->res_pool->pipe_count; i++) {
@@ -1719,43 +1718,36 @@ void dcn401_interdependent_update_lock(struct dc *dc,
 			dc->hwss.pipe_control_lock(dc, pipe, true);
 		}
 	} else {
-		/* Unlock pipes based on the change in DET allocation instead of pipe index
-		 * Prevents over allocation of DET during unlock process
-		 * e.g. 2 pipe config with different streams with a max of 20 DET segments
-		 *	Before:								After:
-		 *		- Pipe0: 10 DET segments			- Pipe0: 12 DET segments
-		 *		- Pipe1: 10 DET segments			- Pipe1: 8 DET segments
-		 * If Pipe0 gets updated first, 22 DET segments will be allocated
-		 */
+		/* Need to free DET being used first and have pipe update, then unlock the remaining pipes*/
 		for (i = 0; i < dc->res_pool->pipe_count; i++) {
 			pipe = &context->res_ctx.pipe_ctx[i];
 			tg = pipe->stream_res.tg;
-			int current_pipe_idx = i;
 
 			if (!resource_is_pipe_type(pipe, OTG_MASTER) ||
 					!tg->funcs->is_tg_enabled(tg) ||
 					dc_state_get_pipe_subvp_type(context, pipe) == SUBVP_PHANTOM) {
-				pipe_unlocked[i] = true;
 				continue;
 			}
 
-			// If the same stream exists in old context, ensure the OTG_MASTER pipes for the same stream get compared
-			struct pipe_ctx *old_otg_master = resource_get_otg_master_for_stream(&dc->current_state->res_ctx, pipe->stream);
-
-			if (old_otg_master)
-				current_pipe_idx = old_otg_master->pipe_idx;
-			if (resource_calculate_det_for_stream(context, pipe) <
-					resource_calculate_det_for_stream(dc->current_state, &dc->current_state->res_ctx.pipe_ctx[current_pipe_idx])) {
+			if (dc->scratch.pipes_to_unlock_first[i]) {
 				dc->hwss.pipe_control_lock(dc, pipe, false);
-				pipe_unlocked[i] = true;
 				dcn401_wait_for_det_buffer_update(dc, context, pipe);
 			}
 		}
 
+		/* Unlocking the rest of the pipes */
 		for (i = 0; i < dc->res_pool->pipe_count; i++) {
-			if (pipe_unlocked[i])
+			if (dc->scratch.pipes_to_unlock_first[i])
 				continue;
+
 			pipe = &context->res_ctx.pipe_ctx[i];
+			tg = pipe->stream_res.tg;
+			if (!resource_is_pipe_type(pipe, OTG_MASTER) ||
+					!tg->funcs->is_tg_enabled(tg) ||
+					dc_state_get_pipe_subvp_type(context, pipe) == SUBVP_PHANTOM) {
+				continue;
+			}
+
 			dc->hwss.pipe_control_lock(dc, pipe, false);
 		}
 	}

drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c

@@ -1867,6 +1867,7 @@ static bool dcn401_resource_construct(
 	dc->config.prefer_easf = true;
 	dc->config.dc_mode_clk_limit_support = true;
 	dc->config.enable_windowed_mpo_odm = true;
+	dc->config.set_pipe_unlock_order = true; /* Need to ensure DET gets freed before allocating */
 	/* read VBIOS LTTPR caps */
 	{
 		if (ctx->dc_bios->funcs->get_lttpr_caps) {