From: Roman Li <Roman.Li@amd.com>
Date: Tue, 23 Jan 2018 11:12:27 -0500
Subject: drm/amd/display: fix boot-up on vega10
Git-commit: 8378fc7e48f2f2b167b5eff9de2d4a76cc1d0ca9
Patch-mainline: v4.16-rc5
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Fixing null-deref on Vega10 due to regression after
'fix cursor related Pstate hang' change.
Added null checks in setting cursor position.

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c |   21 +++++++-----
 1 file changed, 13 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -2950,22 +2950,27 @@ void dce110_set_cursor_position(struct p
 	if (pipe_ctx->top_pipe && pipe_ctx->plane_state != pipe_ctx->top_pipe->plane_state)
 		pos_cpy.enable = false;
 
-	ipp->funcs->ipp_cursor_set_position(ipp, &pos_cpy, &param);
-	mi->funcs->set_cursor_position(mi, &pos_cpy, &param);
+	if (ipp->funcs->ipp_cursor_set_position)
+		ipp->funcs->ipp_cursor_set_position(ipp, &pos_cpy, &param);
+	if (mi->funcs->set_cursor_position)
+		mi->funcs->set_cursor_position(mi, &pos_cpy, &param);
 }
 
 void dce110_set_cursor_attribute(struct pipe_ctx *pipe_ctx)
 {
 	struct dc_cursor_attributes *attributes = &pipe_ctx->stream->cursor_attributes;
 
-	pipe_ctx->plane_res.ipp->funcs->ipp_cursor_set_attributes(
+	if (pipe_ctx->plane_res.ipp->funcs->ipp_cursor_set_attributes)
+		pipe_ctx->plane_res.ipp->funcs->ipp_cursor_set_attributes(
 				pipe_ctx->plane_res.ipp, attributes);
 
-	pipe_ctx->plane_res.mi->funcs->set_cursor_attributes(
-			pipe_ctx->plane_res.mi, attributes);
-
-	pipe_ctx->plane_res.xfm->funcs->set_cursor_attributes(
-		pipe_ctx->plane_res.xfm, attributes);
+	if (pipe_ctx->plane_res.mi->funcs->set_cursor_attributes)
+		pipe_ctx->plane_res.mi->funcs->set_cursor_attributes(
+				pipe_ctx->plane_res.mi, attributes);
+
+	if (pipe_ctx->plane_res.xfm->funcs->set_cursor_attributes)
+		pipe_ctx->plane_res.xfm->funcs->set_cursor_attributes(
+				pipe_ctx->plane_res.xfm, attributes);
 }
 
 static void ready_shared_resources(struct dc *dc, struct dc_state *context) {}