drm/amd/display: always allow pstate change when no dpps are active on dcn315

Prevents certain configs blocking s0i3 when streams aren't completely
removed
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c

@@ -483,7 +483,7 @@ void dcn31_calculate_wm_and_dlg_fp(
 		int pipe_cnt,
 		int vlevel)
 {
-	int i, pipe_idx;
+	int i, pipe_idx, active_dpp_count = 0;
 	double dcfclk = context->bw_ctx.dml.vba.DCFCLKState[vlevel][context->bw_ctx.dml.vba.maxMpcComb];
 
 	dc_assert_fp_enabled();
@@ -528,6 +528,9 @@ void dcn31_calculate_wm_and_dlg_fp(
 		if (!context->res_ctx.pipe_ctx[i].stream)
 			continue;
 
+		if (context->res_ctx.pipe_ctx[i].plane_state)
+			active_dpp_count++;
+
 		pipes[pipe_idx].clks_cfg.dispclk_mhz = get_dispclk_calculated(&context->bw_ctx.dml, pipes, pipe_cnt);
 		pipes[pipe_idx].clks_cfg.dppclk_mhz = get_dppclk_calculated(&context->bw_ctx.dml, pipes, pipe_cnt, pipe_idx);
 
@@ -544,9 +547,9 @@ void dcn31_calculate_wm_and_dlg_fp(
 	}
 
 	dcn20_calculate_dlg_params(dc, context, pipes, pipe_cnt, vlevel);
-	/* For 31x apu pstate change is only supported if possible in vactive */
+	/* For 31x apu pstate change is only supported if possible in vactive or if there are no active dpps */
 	context->bw_ctx.bw.dcn.clk.p_state_change_support =
-			context->bw_ctx.dml.vba.DRAMClockChangeSupport[vlevel][context->bw_ctx.dml.vba.maxMpcComb] == dm_dram_clock_change_vactive;
+			context->bw_ctx.dml.vba.DRAMClockChangeSupport[vlevel][context->bw_ctx.dml.vba.maxMpcComb] == dm_dram_clock_change_vactive || !active_dpp_count;
 }
 
 void dcn31_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)