drm/amd/display: Fix potential integer wraparound resulting in a hang
[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.cyr@amd.com> Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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@ -1742,6 +1742,8 @@ static void delay_cursor_until_vupdate(struct dc *dc, struct pipe_ctx *pipe_ctx)
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return;
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/* Stall out until the cursor update completes. */
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if (vupdate_end < vupdate_start)
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vupdate_end += stream->timing.v_total;
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us_vupdate = (vupdate_end - vupdate_start + 1) * us_per_line;
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udelay(us_to_vupdate + us_vupdate);
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}
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