drm/amd/display: Make function pointer structs const

const to avoid hard-to-find bugs where some function overrides a
function pointer.
Signed-off-by: NHarry Wentland <harry.wentland@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c

@@ -1125,7 +1125,7 @@ void hubp1_vtg_sel(struct hubp *hubp, uint32_t otg_inst)
 	REG_UPDATE(DCHUBP_CNTL, HUBP_VTG_SEL, otg_inst);
 }
 
-static struct hubp_funcs dcn10_hubp_funcs = {
+static const struct hubp_funcs dcn10_hubp_funcs = {
 	.hubp_program_surface_flip_and_addr =
 			hubp1_program_surface_flip_and_addr,
 	.hubp_program_surface_config =

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c

@@ -428,7 +428,7 @@ void mpc1_read_mpcc_state(
 			MPCC_BUSY, &s->busy);
 }
 
-const struct mpc_funcs dcn10_mpc_funcs = {
+static const struct mpc_funcs dcn10_mpc_funcs = {
 	.read_mpcc_state = mpc1_read_mpcc_state,
 	.insert_plane = mpc1_insert_plane,
 	.remove_mpcc = mpc1_remove_mpcc,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c

@@ -385,7 +385,7 @@ void opp1_destroy(struct output_pixel_processor **opp)
 	*opp = NULL;
 }
 
-static struct opp_funcs dcn10_opp_funcs = {
+static const struct opp_funcs dcn10_opp_funcs = {
 		.opp_set_dyn_expansion = opp1_set_dyn_expansion,
 		.opp_program_fmt = opp1_program_fmt,
 		.opp_program_bit_depth_reduction = opp1_program_bit_depth_reduction,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c

@@ -1035,11 +1035,11 @@ static enum dc_status dcn10_validate_plane(const struct dc_plane_state *plane_st
 	return DC_OK;
 }
 
-static struct dc_cap_funcs cap_funcs = {
+static const struct dc_cap_funcs cap_funcs = {
 	.get_dcc_compression_cap = dcn10_get_dcc_compression_cap
 };
 
-static struct resource_funcs dcn10_res_pool_funcs = {
+static const struct resource_funcs dcn10_res_pool_funcs = {
 	.destroy = dcn10_destroy_resource_pool,
 	.link_enc_create = dcn10_link_encoder_create,
 	.validate_bandwidth = dcn_validate_bandwidth,

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

@@ -43,7 +43,7 @@ enum cursor_lines_per_chunk {
 };
 
 struct hubp {
-	struct hubp_funcs *funcs;
+	const struct hubp_funcs *funcs;
 	struct dc_context *ctx;
 	struct dc_plane_address request_address;
 	struct dc_plane_address current_address;