We get 3 warnings when building kernel with W=1:
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/pp_acpi.c:29:6: warning: no 
previous prototype for 'acpi_atcs_functions_supported' [-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/pp_acpi.c:47:6: warning: no 
previous prototype for 'acpi_atcs_notify_pcie_device_ready' 
[-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/pp_acpi.c:61:5: warning: no 
previous prototype for 'acpi_pcie_perf_request' [-Wmissing-prototypes]

In fact, these functions are declared in
drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h,
so this patch adds missing header dependencies.

Signed-off-by: Baoyou Xie <baoyou....@linaro.org>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c 
b/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
index 1944d28..f5e8fda 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)
 {
-- 
2.7.4

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