From: Tony Cheng <tony.cheng@amd.com>
Date: Thu, 19 Jan 2017 14:46:26 -0500
Subject: drm/amd/display: clean up redundant logic
Git-commit: e4e354b02fa8b6d53ec65bd5dbd27d014e4e752f
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@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/core/dc_surface.c |   23 ++++++++---------------
 drivers/gpu/drm/amd/display/dc/dc.h              |    1 -
 2 files changed, 8 insertions(+), 16 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_surface.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_surface.c
@@ -121,26 +121,20 @@ const struct dc_surface_status *dc_surfa
 		const struct dc_surface *dc_surface)
 {
 	struct dc_surface_status *surface_status;
-	struct core_surface *core_surface;
+	struct core_surface *core_surface = DC_SURFACE_TO_CORE(dc_surface);;
 	struct core_dc *core_dc;
 	int i;
 
-	if (dc_surface == NULL)
-		return NULL;
-
-	core_surface = DC_SURFACE_TO_CORE(dc_surface);
-
-	if (core_surface == NULL || core_surface->ctx == NULL)
-		return NULL;
+	if (!dc_surface ||
+		!core_surface->ctx ||
+		!core_surface->ctx->dc) {
+		ASSERT(0);
+		return NULL; /* remove this if above assert never hit */
+	}
 
 	surface_status = &core_surface->status;
-
-	if (core_surface->ctx == NULL || core_surface->ctx->dc == NULL)
-		return NULL;
-
 	core_dc = DC_TO_CORE(core_surface->ctx->dc);
 
-
 	if (core_dc->current_context == NULL)
 		return NULL;
 
@@ -149,8 +143,7 @@ const struct dc_surface_status *dc_surfa
 		struct pipe_ctx *pipe_ctx =
 				&core_dc->current_context->res_ctx.pipe_ctx[i];
 
-		if (pipe_ctx->surface !=
-				DC_SURFACE_TO_CORE(dc_surface))
+		if (pipe_ctx->surface != core_surface)
 			continue;
 
 		core_dc->hwss.update_pending_status(pipe_ctx);
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -335,7 +335,6 @@ struct dc_transfer_func *dc_create_trans
 struct dc_flip_addrs {
 	struct dc_plane_address address;
 	bool flip_immediate;
-	/* TODO: DCC format info */
 	/* TODO: add flip duration for FreeSync */
 };