drm/amd/display: Enable DTBCLK DTO earlier in the sequence

[why]
As per programming guide, we need to
enable the virtual pixel clock via DTBCLK
DTO and ungate the clock before we begin
programming OPP/OPTC control registers.
Otherwise, the double-buffered registers
will be left pending until the clocks are enabled.

[how]
Move the DTBCLK DTO programming up to
where we do the legacy DP DTO programming.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Sung Joon Kim <sungjoon.kim@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/hwss/dcn20/dcn20_hwseq.c

@@ -873,6 +873,22 @@ enum dc_status dcn20_enable_stream_timing(
 		return DC_ERROR_UNEXPECTED;
 	}
 
+	if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx)) {
+		struct dccg *dccg = dc->res_pool->dccg;
+		struct timing_generator *tg = pipe_ctx->stream_res.tg;
+		struct dtbclk_dto_params dto_params = {0};
+
+		if (dccg->funcs->set_dtbclk_p_src)
+			dccg->funcs->set_dtbclk_p_src(dccg, DTBCLK0, tg->inst);
+
+		dto_params.otg_inst = tg->inst;
+		dto_params.pixclk_khz = pipe_ctx->stream->timing.pix_clk_100hz / 10;
+		dto_params.num_odm_segments = get_odm_segment_count(pipe_ctx);
+		dto_params.timing = &pipe_ctx->stream->timing;
+		dto_params.ref_dtbclk_khz = dc->clk_mgr->funcs->get_dtb_ref_clk_frequency(dc->clk_mgr);
+		dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
+	}
+
 	if (dc_is_hdmi_tmds_signal(stream->signal)) {
 		stream->link->phy_state.symclk_ref_cnts.otg = 1;
 		if (stream->link->phy_state.symclk_state == SYMCLK_OFF_TX_OFF)
@@ -959,22 +975,6 @@ enum dc_status dcn20_enable_stream_timing(
 			pipe_ctx->stream_res.tg->funcs->phantom_crtc_post_enable(pipe_ctx->stream_res.tg);
 	}
 
-	if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx)) {
-		struct dccg *dccg = dc->res_pool->dccg;
-		struct timing_generator *tg = pipe_ctx->stream_res.tg;
-		struct dtbclk_dto_params dto_params = {0};
-
-		if (dccg->funcs->set_dtbclk_p_src)
-			dccg->funcs->set_dtbclk_p_src(dccg, DTBCLK0, tg->inst);
-
-		dto_params.otg_inst = tg->inst;
-		dto_params.pixclk_khz = pipe_ctx->stream->timing.pix_clk_100hz / 10;
-		dto_params.num_odm_segments = get_odm_segment_count(pipe_ctx);
-		dto_params.timing = &pipe_ctx->stream->timing;
-		dto_params.ref_dtbclk_khz = dc->clk_mgr->funcs->get_dtb_ref_clk_frequency(dc->clk_mgr);
-		dccg->funcs->set_dtbclk_dto(dccg, &dto_params);
-	}
-
 	return DC_OK;
 }