[PATCH] drm/amd/display: Use div_u64 for flip timestamp ns to ms

[Deucher, Alexander]

Could also use do_div.  Either way:

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Sent: Wednesday, December 19, 2018 9:12:09 AM
To: amd-gfx at lists.freedesktop.org
Cc: Li, Sun peng (Leo); Wentland, Harry; Kazlauskas, Nicholas
Subject: [PATCH] drm/amd/display: Use div_u64 for flip timestamp ns to ms

Resolves __udivdi3 missing errors when building for i386.

Fixes: 6378ef012ddc ("drm/amd/display: Add below the range support for FreeSync")

Change-Id: I4ded5790160054e6908367f20a63257225517714
Cc: Leo Li <sunpeng.li at amd.com>
Cc: Harry Wentland <harry.wentland at amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index e16e62139ec3..920649332055 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4550,6 +4550,7 @@ static void amdgpu_dm_do_flip(struct drm_crtc *crtc,
                               struct dc_state *state)
 {
         unsigned long flags;
+       uint64_t timestamp_ns;
         uint32_t target_vblank;
         int r, vpos, hpos;
         struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
@@ -4612,7 +4613,9 @@ static void amdgpu_dm_do_flip(struct drm_crtc *crtc,
         addr.address.grph.addr.low_part = lower_32_bits(afb->address);
         addr.address.grph.addr.high_part = upper_32_bits(afb->address);
         addr.flip_immediate = async_flip;
-       addr.flip_timestamp_in_us = ktime_get_ns() / 1000;
+
+       timestamp_ns = ktime_get_ns();
+       addr.flip_timestamp_in_us = div_u64(timestamp_ns, 1000);


         if (acrtc->base.state->event)
--
2.17.1

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