drm/amd/display: add an option to skip wait for HPD when powering on eDP panel

[HOW/WHY]
Add an option to skip edp_wait_for_hpd_ready when necessary

Reviewed-by: Jayendran Ramani <[e-mail]>
Acked-by: Rodrigo Siqueira <[e-mail]>
Signed-off-by: Evgenii Krasnikov <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 			dc_is_dp_signal(pipe_ctx->stream->signal));
 }
 
-void edp_panel_backlight_power_on(struct dc_link *link)
+void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd)
 {
 	if (link->connector_signal != SIGNAL_TYPE_EDP)
 		return;
 
 	link->dc->hwss.edp_power_control(link, true);
-	link->dc->hwss.edp_wait_for_hpd_ready(link, true);
+	if (wait_for_hpd)
+		link->dc->hwss.edp_wait_for_hpd_ready(link, true);
 	if (link->dc->hwss.edp_backlight_control)
 		link->dc->hwss.edp_backlight_control(link, true);
 }

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

···
 		struct link_training_settings *lt_settings);
 
 enum dp_link_encoding dp_get_link_encoding_format(const struct dc_link_settings *link_settings);
+bool dp_retrieve_lttpr_cap(struct dc_link *link);
 bool dpcd_write_128b_132b_sst_payload_allocation_table(
 		const struct dc_stream_state *stream,
 		struct dc_link *link,
···
 void disable_dp_hpo_output(struct dc_link *link,
 		const struct link_resource *link_res,
 		enum signal_type signal);
+
 void setup_dp_hpo_stream(struct pipe_ctx *pipe_ctx, bool enable);
 bool is_dp_128b_132b_signal(struct pipe_ctx *pipe_ctx);
-
-bool dp_retrieve_lttpr_cap(struct dc_link *link);
-void edp_panel_backlight_power_on(struct dc_link *link);
+void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd);
 void dp_receiver_power_ctrl(struct dc_link *link, bool on);
 void dp_source_sequence_trace(struct dc_link *link, uint8_t dp_test_mode);
 void dp_enable_link_phy(