diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index a074edd95c701c2705e2323bfaf713692a852654..01a42b6a69a4bb8b3b1653e57bf28da6cb5911e1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -24,6 +24,7 @@
  */
 #include <drm/drmP.h>
 #include "amdgpu.h"
+#include "amdgpu_gfx.h"
 
 /*
  * GPU scratch registers helpers function.
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index 51321e154c09997037cf51ffa8bad5a0a90f5e67..e020440864450130ed0b2a017b68214f352c5126 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -27,6 +27,7 @@
 int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg);
 void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg);
 
-unsigned amdgpu_gfx_parse_disable_cu(unsigned *mask, unsigned max_se, unsigned max_sh);
+void amdgpu_gfx_parse_disable_cu(unsigned *mask, unsigned max_se,
+		unsigned max_sh);
 
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_crtc.c b/drivers/gpu/drm/amd/amdgpu/atombios_crtc.c
index f7d236f95e74262dd6970050de140c1b01f0b017..8c9bc75a9c2db63288f2c6765b02f68f63875194 100644
--- a/drivers/gpu/drm/amd/amdgpu/atombios_crtc.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_crtc.c
@@ -31,6 +31,7 @@
 #include "atom.h"
 #include "atom-bits.h"
 #include "atombios_encoders.h"
+#include "atombios_crtc.h"
 #include "amdgpu_atombios.h"
 #include "amdgpu_pll.h"
 #include "amdgpu_connectors.h"
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index e5d0edfb4309e0a0c9b665010bdecc9af45ef53b..199d3f7235d6b2699ebebd02733bf02b3bab7fc0 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -31,6 +31,7 @@
 #include "atombios_encoders.h"
 #include "amdgpu_pll.h"
 #include "amdgpu_connectors.h"
+#include "dce_v10_0.h"
 
 #include "dce/dce_10_0_d.h"
 #include "dce/dce_10_0_sh_mask.h"
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
index 9719b2b1418632eb0db1c95351a22efbabf251c5..ecd000e359819f33e599483636dbb34c134abf08 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c
@@ -31,6 +31,7 @@
 #include "atombios_encoders.h"
 #include "amdgpu_pll.h"
 #include "amdgpu_connectors.h"
+#include "dce_v11_0.h"
 
 #include "dce/dce_11_0_d.h"
 #include "dce/dce_11_0_sh_mask.h"
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 16a2f1faaf19f781764aaf9abc6dfdc6e02cf0d8..979aedf4b74d3b3aea5f27b4d98fc765d02a78bc 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -31,6 +31,7 @@
 #include "atombios_encoders.h"
 #include "amdgpu_pll.h"
 #include "amdgpu_connectors.h"
+#include "dce_v8_0.h"
 
 #include "dce/dce_8_0_d.h"
 #include "dce/dce_8_0_sh_mask.h"
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c b/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
index 1944d289f84603f0c0eab21a478a0c5ace8835a7..f5e8fda964f7836a753bb0fa6f2558613b5d2a33 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
@@ -25,6 +25,7 @@
 #include "linux/delay.h"
 #include "hwmgr.h"
 #include "amd_acpi.h"
+#include "pp_acpi.h"
 
 bool acpi_atcs_functions_supported(void *device, uint32_t index)
 {
diff --git a/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h b/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
index 3df5de2cdab0254becae8ab384e4f8feb2cd2c8d..8fe8ba9434ffa344e36503591f98e4501b23aff8 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
@@ -21,9 +21,6 @@
  *
  */
 
-extern bool acpi_atcs_functions_supported(void *device,
-							uint32_t index);
-extern int acpi_pcie_perf_request(void *device,
-						uint8_t perf_req,
-						bool advertise);
-extern bool acpi_atcs_notify_pcie_device_ready(void *device);
+bool acpi_atcs_functions_supported(void *device, uint32_t index);
+int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise);
+bool acpi_atcs_notify_pcie_device_ready(void *device);