drm/amd/display: Fix DP2.0 timing sync

[Why]
Triggering OTG sync before all OTG/HPO clock programming is complete
causes timing sync to fail and a subsequent P-state hang.

[How]
Move DTB clock programming earlier in the sequence to
enable_stream_timing.

Reviewed-by: Ariel Bernstein <[e-mail]>
Acked-by: Wayne Lin <[e-mail]>
Signed-off-by: Ilya Bakoulin <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

···
 	return flow_ctrl_cnt;
 }
 
+static enum phyd32clk_clock_source get_phyd32clk_src(struct dc_link *link)
+{
+	switch (link->link_enc->transmitter) {
+	case TRANSMITTER_UNIPHY_A:
+		return PHYD32CLKA;
+	case TRANSMITTER_UNIPHY_B:
+		return PHYD32CLKB;
+	case TRANSMITTER_UNIPHY_C:
+		return PHYD32CLKC;
+	case TRANSMITTER_UNIPHY_D:
+		return PHYD32CLKD;
+	case TRANSMITTER_UNIPHY_E:
+		return PHYD32CLKE;
+	default:
+		return PHYD32CLKA;
+	}
+}
+
+static int get_odm_segment_count(struct pipe_ctx *pipe_ctx)
+{
+	struct pipe_ctx *odm_pipe = pipe_ctx->next_odm_pipe;
+	int count = 1;
+
+	while (odm_pipe != NULL) {
+		count++;
+		odm_pipe = odm_pipe->next_odm_pipe;
+	}
+
+	return count;
+}
+
 enum dc_status dcn20_enable_stream_timing(
 		struct pipe_ctx *pipe_ctx,
 		struct dc_state *context,
···
 		if (pipe_ctx->stream_res.tg && pipe_ctx->stream_res.tg->funcs->phantom_crtc_post_enable)
 			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;
 }
 
···
 	ASSERT(new_mpcc != NULL);
 	hubp->opp_id = pipe_ctx->stream_res.opp->inst;
 	hubp->mpcc_id = mpcc_id;
-}
-
-static enum phyd32clk_clock_source get_phyd32clk_src(struct dc_link *link)
-{
-	switch (link->link_enc->transmitter) {
-	case TRANSMITTER_UNIPHY_A:
-		return PHYD32CLKA;
-	case TRANSMITTER_UNIPHY_B:
-		return PHYD32CLKB;
-	case TRANSMITTER_UNIPHY_C:
-		return PHYD32CLKC;
-	case TRANSMITTER_UNIPHY_D:
-		return PHYD32CLKD;
-	case TRANSMITTER_UNIPHY_E:
-		return PHYD32CLKE;
-	default:
-		return PHYD32CLKA;
-	}
-}
-
-static int get_odm_segment_count(struct pipe_ctx *pipe_ctx)
-{
-	struct pipe_ctx *odm_pipe = pipe_ctx->next_odm_pipe;
-	int count = 1;
-
-	while (odm_pipe != NULL) {
-		count++;
-		odm_pipe = odm_pipe->next_odm_pipe;
-	}
-
-	return count;
 }
 
 void dcn20_enable_stream(struct pipe_ctx *pipe_ctx)

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c

···
 	.set_pixel_rate_div = dccg314_set_pixel_rate_div,
 	.trigger_dio_fifo_resync = dccg314_trigger_dio_fifo_resync,
 	.set_valid_pixel_rate = dccg314_set_valid_pixel_rate,
+	.set_dtbclk_p_src = dccg314_set_dtbclk_p_src
 };
 
 struct dccg *dccg314_create(

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c

···
 	.otg_drop_pixel = dccg32_otg_drop_pixel,
 	.set_pixel_rate_div = dccg32_set_pixel_rate_div,
 	.trigger_dio_fifo_resync = dccg32_trigger_dio_fifo_resync,
+	.set_dtbclk_p_src = dccg32_set_dtbclk_p_src,
 };
 
 struct dccg *dccg32_create(

drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dccg.c

···
 	.set_valid_pixel_rate = dccg35_set_valid_pixel_rate,
 	.enable_symclk_se = dccg35_enable_symclk_se,
 	.disable_symclk_se = dccg35_disable_symclk_se,
+	.set_dtbclk_p_src = dccg35_set_dtbclk_p_src,
 };
 
 struct dccg *dccg35_create(

drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h

···
 	void (*set_dp_dto)(
 			struct dccg *dccg,
 			const struct dp_dto_params *params);
+	void (*set_dtbclk_p_src)(
+			struct dccg *dccg,
+			enum streamclk_source src,
+			uint32_t otg_inst);
 };
 
 #endif //__DAL_DCCG_H__