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Date:   Mon,  8 Jul 2019 15:53:18 +0200
From:   Arnd Bergmann <>
To:     Harry Wentland <>,
        Leo Li <>,
        Alex Deucher <>,
        Christian K├Ânig <>,
        "David (ChunMing) Zhou" <>,
        David Airlie <>,
        Daniel Vetter <>
Cc:     Arnd Bergmann <>,
        Bhawanpreet Lakha <>,
        Tony Cheng <>,
        Joshua Aberback <>,
        Wenjing Liu <>,
        Dmytro Laktyushkin <>,,,
Subject: [PATCH] drm/amd/display: dcn20: include linux/delay.h

Without this header, we get a compiler error in some configurations:

.../dc/dcn20/dcn20_hwseq.c: In function 'dcn20_hwss_wait_for_blank_complete':
.../dc/dcn20/dcn20_hwseq.c:1493:3: error: implicit declaration of function 'udelay' [-Werror=implicit-function-declaration]

Note: the use of udelay itself may be problematic, as can occupy
the CPU for 200ms in a busy-loop here.

Fixes: 7ed4e6352c16 ("drm/amd/display: Add DCN2 HW Sequencer and Resource")
Signed-off-by: Arnd Bergmann <>
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
index 4b0d8b9f61da..6925d25d2457 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
@@ -22,6 +22,7 @@
  * Authors: AMD
+#include <linux/delay.h>
 #include "dm_services.h"
 #include "dm_helpers.h"

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