From: Roman Li <Roman.Li@amd.com>
Date: Wed, 26 Jul 2017 14:42:38 -0400
Subject: drm/amd/display: safeguard compressor api
Git-commit: 2f3bfb2794e1aed018e344469f9c371f36f12867
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Only call compressor api if it's available.

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Acked-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 |    9 ++++++---
 1 file changed, 6 insertions(+), 3 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
@@ -1185,7 +1185,8 @@ static void power_down_all_hw_blocks(str
 	power_down_clock_sources(dc);
 
 #ifdef ENABLE_FBC
-	dc->fbc_compressor->funcs->disable_fbc(dc->fbc_compressor);
+	if (dc->fbc_compressor)
+		dc->fbc_compressor->funcs->disable_fbc(dc->fbc_compressor);
 #endif
 }
 
@@ -1658,7 +1659,8 @@ enum dc_status dce110_apply_ctx_to_hw(
 	set_safe_displaymarks(&context->res_ctx, dc->res_pool);
 
 #ifdef ENABLE_FBC
-	dc->fbc_compressor->funcs->disable_fbc(dc->fbc_compressor);
+	if (dc->fbc_compressor)
+		dc->fbc_compressor->funcs->disable_fbc(dc->fbc_compressor);
 #endif
 	/*TODO: when pplib works*/
 	apply_min_clocks(dc, context, &clocks_state, true);
@@ -2246,7 +2248,8 @@ static void init_hw(struct core_dc *dc)
 		abm->funcs->abm_init(abm);
 	}
 #ifdef ENABLE_FBC
-	dc->fbc_compressor->funcs->power_up_fbc(dc->fbc_compressor);
+	if (dc->fbc_compressor)
+		dc->fbc_compressor->funcs->power_up_fbc(dc->fbc_compressor);
 #endif
 }