drm/amd/display: Revert wait vblank on update dpp clock

[Why]
This change only fix dpp clock switch to lower case.
New solution later can fix both case, which is "dc: skip
program clock when allow seamless boot"

[How]
This reverts commit "dc: wait vblank when stream enabled
and update dpp clock"
Signed-off-by: Lewis Huang <Lewis.Huang@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Wayne Lin <waynelin@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/clk_mgr/dcn21/rn_clk_mgr.c

@@ -128,7 +128,7 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
 	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
 	struct dc_clocks *new_clocks = &context->bw_ctx.bw.dcn.clk;
 	struct dc *dc = clk_mgr_base->ctx->dc;
-	int display_count, i;
+	int display_count;
 	bool update_dppclk = false;
 	bool update_dispclk = false;
 	bool dpp_clock_lowered = false;
@@ -210,14 +210,6 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
 				clk_mgr_base->clks.dppclk_khz,
 				safe_to_lower);
 
-		for (i = 0; i < context->stream_count; i++) {
-			if (context->streams[i]->signal == SIGNAL_TYPE_EDP &&
-				context->streams[i]->apply_seamless_boot_optimization) {
-				dc_wait_for_vblank(dc, context->streams[i]);
-				break;
-			}
-		}
-
 		clk_mgr_base->clks.actual_dppclk_khz =
 				rn_vbios_smu_set_dppclk(clk_mgr, clk_mgr_base->clks.dppclk_khz);
 

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

@@ -3219,19 +3219,6 @@ void dc_link_remove_remote_sink(struct dc_link *link, struct dc_sink *sink)
 	}
 }
 
-void dc_wait_for_vblank(struct dc *dc, struct dc_stream_state *stream)
-{
-	int i;
-
-	for (i = 0; i < dc->res_pool->pipe_count; i++)
-		if (dc->current_state->res_ctx.pipe_ctx[i].stream == stream) {
-			struct timing_generator *tg =
-				dc->current_state->res_ctx.pipe_ctx[i].stream_res.tg;
-			tg->funcs->wait_for_state(tg, CRTC_STATE_VBLANK);
-			break;
-		}
-}
-
 void get_clock_requirements_for_state(struct dc_state *state, struct AsicStateEx *info)
 {
 	info->displayClock				= (unsigned int)state->bw_ctx.bw.dcn.clk.dispclk_khz;

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

@@ -719,7 +719,6 @@ void dc_init_callbacks(struct dc *dc,
 void dc_deinit_callbacks(struct dc *dc);
 void dc_destroy(struct dc **dc);
 
-void dc_wait_for_vblank(struct dc *dc, struct dc_stream_state *stream);
 /*******************************************************************************
  * Surface Interfaces
  ******************************************************************************/