[PATCH] drm/amd/display: fix compilation error

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this patch fixes below compilation error

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c: In
function ‘dcn10_apply_ctx_for_surface’:
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:2378:3:
error: implicit declaration of function ‘udelay’
[-Werror=implicit-function-declaration]
   udelay(underflow_check_delay_us);

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@xxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index d2352949..1ac9a4f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -23,6 +23,7 @@
  *
  */
 
+#include <linux/delay.h>
 #include "dm_services.h"
 #include "core_types.h"
 #include "resource.h"
-- 
2.7.4

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