drm/amd/display: Enable double buffer for OTG_BLANK

[Why]
Currently if seamless boot is enabled, we will skip double buffer enable
for OTG_BLANK. However, we need the double buffer enable in order to
block global sync signals when OTG becomes blanked (for PSR). Blocking
global sync signals prevent pipe from requesting data.

[How]
Move tg_init before seamless boot check.
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1188,8 +1188,14 @@ void dcn10_init_pipes(struct dc *dc, struct dc_state *context)
 		if (can_apply_seamless_boot &&
 			pipe_ctx->stream != NULL &&
 			pipe_ctx->stream_res.tg->funcs->is_tg_enabled(
-				pipe_ctx->stream_res.tg))
+				pipe_ctx->stream_res.tg)) {
+			// Enable double buffering for OTG_BLANK no matter if
+			// seamless boot is enabled or not to suppress global sync
+			// signals when OTG blanked. This is to prevent pipe from
+			// requesting data while in PSR.
+			tg->funcs->tg_init(tg);
 			continue;
+		}
 
 		/* Disable on the current state so the new one isn't cleared. */
 		pipe_ctx = &dc->current_state->res_ctx.pipe_ctx[i];