drm/amdgpu/display: disable eDP fast boot optimization on DCE8

Seems to cause blank screens.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=106940Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -1588,7 +1588,13 @@ void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context)
 	bool can_eDP_fast_boot_optimize = false;
 
 	if (edp_link) {
-		can_eDP_fast_boot_optimize =
+		/* this seems to cause blank screens on DCE8 */
+		if ((dc->ctx->dce_version == DCE_VERSION_8_0) ||
+		    (dc->ctx->dce_version == DCE_VERSION_8_1) ||
+		    (dc->ctx->dce_version == DCE_VERSION_8_3))
+			can_eDP_fast_boot_optimize = false;
+		else
+			can_eDP_fast_boot_optimize =
 				edp_link->link_enc->funcs->is_dig_enabled(edp_link->link_enc);
 	}