From: Aric Cyr <aric....@amd.com>

[Why]
If VUPDATE_END is before VUPDATE_START the delay calculated can become
very large, causing a soft hang.

[How]
Take the absolute value of the difference between START and END.

Signed-off-by: Aric Cyr <aric....@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 2 ++
 1 file changed, 2 insertions(+)

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 4db6ec96eea1..0313ca83cdb9 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
@@ -1742,6 +1742,8 @@ static void delay_cursor_until_vupdate(struct dc *dc, 
struct pipe_ctx *pipe_ctx)
                return;
 
        /* Stall out until the cursor update completes. */
+       if (vupdate_end < vupdate_start)
+               vupdate_end += stream->timing.v_total;
        us_vupdate = (vupdate_end - vupdate_start + 1) * us_per_line;
        udelay(us_to_vupdate + us_vupdate);
 }
-- 
2.17.1

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