drm/amd/display: For FPO + Vactive check that all pipes support VA

[Description]
For FPO + Vactive scenarios we must check that all non-FPO pipes
have VACTIVE margin to allow it. The previous check only confirmed
that there is at least one pipe that has vactive margin, but this
is incorrect as the vactive display could be using two pipes (MPO)
where the desktop plane has vactive margin, and the video plane
does not.

Reviewed-by: Samson Tam <samson.tam@amd.com>
Reviewed-by: Chaitanya Dhere <chaitanya.dhere@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@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/dcn32/dcn32_resource_helpers.c

@@ -545,7 +545,7 @@ struct dc_stream_state *dcn32_can_support_mclk_switch_using_fw_based_vblank_stre
 		if (fpo_candidate_stream)
 			fpo_stream_status = dc_state_get_stream_status(context, fpo_candidate_stream);
 		DC_FP_START();
-		is_fpo_vactive = dcn32_find_vactive_pipe(dc, context, dc->debug.fpo_vactive_min_active_margin_us);
+		is_fpo_vactive = dcn32_find_vactive_pipe(dc, context, fpo_candidate_stream, dc->debug.fpo_vactive_min_active_margin_us);
 		DC_FP_END();
 		if (!is_fpo_vactive || dc->debug.disable_fpo_vactive)
 			return NULL;

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c

@@ -3521,15 +3521,16 @@ void dcn32_assign_fpo_vactive_candidate(struct dc *dc, const struct dc_state *co
  *
  * @dc: current dc state
  * @context: new dc state
+ * @fpo_candidate_stream: candidate stream to be chosen for FPO
  * @vactive_margin_req_us: The vactive marign required for a vactive pipe to be considered "found"
  *
  * Return: True if VACTIVE display is found, false otherwise
  */
-bool dcn32_find_vactive_pipe(struct dc *dc, const struct dc_state *context, uint32_t vactive_margin_req_us)
+bool dcn32_find_vactive_pipe(struct dc *dc, const struct dc_state *context, struct dc_stream_state *fpo_candidate_stream, uint32_t vactive_margin_req_us)
 {
 	unsigned int i, pipe_idx;
 	const struct vba_vars_st *vba = &context->bw_ctx.dml.vba;
-	bool vactive_found = false;
+	bool vactive_found = true;
 	unsigned int blank_us = 0;
 
 	for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
@@ -3538,11 +3539,20 @@ bool dcn32_find_vactive_pipe(struct dc *dc, const struct dc_state *context, uint
 		if (!pipe->stream)
 			continue;
 
+		/* Don't need to check for vactive margin on the FPO candidate stream */
+		if (fpo_candidate_stream && pipe->stream == fpo_candidate_stream) {
+			pipe_idx++;
+			continue;
+		}
+
+		/* Every plane (apart from the ones driven by the FPO pipes) needs to have active margin
+		 * in order for us to have found a valid "vactive" config for FPO + Vactive
+		 */
 		blank_us = ((pipe->stream->timing.v_total - pipe->stream->timing.v_addressable) * pipe->stream->timing.h_total /
 				(double)(pipe->stream->timing.pix_clk_100hz * 100)) * 1000000;
-		if (vba->ActiveDRAMClockChangeLatencyMarginPerState[vba->VoltageLevel][vba->maxMpcComb][vba->pipe_plane[pipe_idx]] >= vactive_margin_req_us &&
-				!(pipe->stream->vrr_active_variable || pipe->stream->vrr_active_fixed) && blank_us < dc->debug.fpo_vactive_max_blank_us) {
-			vactive_found = true;
+		if (vba->ActiveDRAMClockChangeLatencyMarginPerState[vba->VoltageLevel][vba->maxMpcComb][vba->pipe_plane[pipe_idx]] < vactive_margin_req_us ||
+				pipe->stream->vrr_active_variable || pipe->stream->vrr_active_fixed || blank_us >= dc->debug.fpo_vactive_max_blank_us) {
+			vactive_found = false;
 			break;
 		}
 		pipe_idx++;

drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.h

@@ -71,7 +71,7 @@ void dcn32_zero_pipe_dcc_fraction(display_e2e_pipe_params_st *pipes,
 
 void dcn32_assign_fpo_vactive_candidate(struct dc *dc, const struct dc_state *context, struct dc_stream_state **fpo_candidate_stream);
 
-bool dcn32_find_vactive_pipe(struct dc *dc, const struct dc_state *context, uint32_t vactive_margin_req);
+bool dcn32_find_vactive_pipe(struct dc *dc, const struct dc_state *context, struct dc_stream_state *fpo_candidate_stream, uint32_t vactive_margin_req);
 
 void dcn32_override_min_req_memclk(struct dc *dc, struct dc_state *context);