drm/amd/display: Exit idle optimizations before attempt to access PHY

[Why & How]
DMUB may hang when powering down pixel clocks due to no dprefclk.

It is fixed by exiting idle optimization before the attempt to access PHY.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Leo Chen <sancchen@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/dce110/dce110_hw_sequencer.c

@@ -1792,10 +1792,13 @@ void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context)
 			hws->funcs.edp_backlight_control(edp_link_with_sink, false);
 		}
 		/*resume from S3, no vbios posting, no need to power down again*/
+		clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr);
+
 		power_down_all_hw_blocks(dc);
 		disable_vga_and_power_gate_all_controllers(dc);
 		if (edp_link_with_sink && !keep_edp_vdd_on)
 			dc->hwss.edp_power_control(edp_link_with_sink, false);
+		clk_mgr_optimize_pwr_state(dc, dc->clk_mgr);
 	}
 	bios_set_scratch_acc_mode_change(dc->ctx->dc_bios, 1);
 }