[PATCH igt] Revert "kms_cursor_legacy: Add a burner thread to make basic-busy-* pass."

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This reverts commit 7c8703fb02b248c2bcf9756bba8812bcfe7ed5d3.

If we expect it to fail until we find a solution, let the hw fail and
continue to track the known failure in CI/bugs.

Cc: Martin Peres <martin.peres@xxxxxxxxxxxxxxx>
---
 tests/kms_cursor_legacy.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/tests/kms_cursor_legacy.c b/tests/kms_cursor_legacy.c
index 2eb1d1bd..ac05ca53 100644
--- a/tests/kms_cursor_legacy.c
+++ b/tests/kms_cursor_legacy.c
@@ -618,23 +618,9 @@ static void basic_flip_cursor(igt_display_t *display,
 		do_ioctl(display->drm_fd, DRM_IOCTL_MODE_CURSOR, &arg[0]);
 
 		busy = NULL;
-		if (flags & BASIC_BUSY) {
+		if (flags & BASIC_BUSY)
 			busy = make_fb_busy(display->drm_fd, &fb_info);
 
-			/*
-			 * Prevent going into C3 or higher state
-			 * or we may miss vblank interrupts on SNB.
-			 */
-			igt_fork(child, 1) {
-				struct sched_param parm = { .sched_priority = 0 };
-
-				igt_assert(sched_setscheduler(0, SCHED_IDLE, &parm) == 0);
-
-				while (*busy != MI_BATCH_BUFFER_END)
-					sched_yield();
-			}
-		}
-
 		/* Start with a synchronous query to align with the vblank */
 		vblank_start = get_vblank(display->drm_fd, pipe, DRM_VBLANK_NEXTONMISS);
 
@@ -699,8 +685,6 @@ static void basic_flip_cursor(igt_display_t *display,
 
 		delta = get_vblank(display->drm_fd, pipe, 0) - vblank_start;
 
-		igt_waitchildren();
-
 		if (!mode_requires_extra_vblank(mode))
 			miss2 += delta != 1;
 		else
-- 
2.11.0

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