drm/amd/display: make function tables const

It is good practice to make global function tables const to avoid
accidental override.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c

@@ -729,7 +729,7 @@ static bool dce_mi_program_surface_flip_and_addr(
 	return true;
 }
 
-static struct mem_input_funcs dce_mi_funcs = {
+static const struct mem_input_funcs dce_mi_funcs = {
 	.mem_input_program_display_marks = dce_mi_program_display_marks,
 	.allocate_mem_input = dce_mi_allocate_dmif,
 	.free_mem_input = dce_mi_free_dmif,
@@ -741,7 +741,7 @@ static struct mem_input_funcs dce_mi_funcs = {
 	.mem_input_is_flip_pending = dce_mi_is_flip_pending
 };
 
-static struct mem_input_funcs dce112_mi_funcs = {
+static const struct mem_input_funcs dce112_mi_funcs = {
 	.mem_input_program_display_marks = dce112_mi_program_display_marks,
 	.allocate_mem_input = dce_mi_allocate_dmif,
 	.free_mem_input = dce_mi_free_dmif,
@@ -753,7 +753,7 @@ static struct mem_input_funcs dce112_mi_funcs = {
 	.mem_input_is_flip_pending = dce_mi_is_flip_pending
 };
 
-static struct mem_input_funcs dce120_mi_funcs = {
+static const struct mem_input_funcs dce120_mi_funcs = {
 	.mem_input_program_display_marks = dce120_mi_program_display_marks,
 	.allocate_mem_input = dce_mi_allocate_dmif,
 	.free_mem_input = dce_mi_free_dmif,

drivers/gpu/drm/amd/display/dc/dce110/dce110_mem_input_v.c

@@ -1011,7 +1011,7 @@ void dce110_free_mem_input_v(
 {
 }
 
-static struct mem_input_funcs dce110_mem_input_v_funcs = {
+static const struct mem_input_funcs dce110_mem_input_v_funcs = {
 	.mem_input_program_display_marks =
 			dce_mem_input_v_program_display_marks,
 	.mem_input_program_chroma_display_marks =

drivers/gpu/drm/amd/display/dc/inc/hw/mem_input.h

@@ -64,7 +64,7 @@ struct stutter_modes {
 };
 
 struct mem_input {
-	struct mem_input_funcs *funcs;
+	const struct mem_input_funcs *funcs;
 	struct dc_context *ctx;
 	struct dc_plane_address request_address;
 	struct dc_plane_address current_address;