diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/Makefile b/drivers/gpu/drm/amd/display/dc/dml2_0/Makefile
index 5388bf094fbc..b3e23dbf2ebf 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2_0/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml2_0/Makefile
@@ -62,7 +62,8 @@ subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/dc/dml2_0/dml21/src/dml2_cga/
 THIS_MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 DML2_ABS_PATH := $(patsubst %/,%,$(dir $(THIS_MAKEFILE_PATH)))
 
-DML2_C_FILES := $(shell find $(DML2_ABS_PATH) -name '*.c')
+rwildcard = $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$(2)) $(filter $(subst *,%,$(2)),$d))
+DML2_C_FILES := $(call rwildcard,$(DML2_ABS_PATH)/,*.c)
 
 # FPU flags step 2: Convert to .o and make paths relative to $(AMDDALPATH)/dc/dml2_0/
 DML2_RELATIVE_O_FILES := $(patsubst $(DML2_ABS_PATH)/%,dc/dml2_0/%,$(patsubst %.c,%.o,$(DML2_C_FILES)))