Revert "drm/amdgpu: fix vblank_time when displays are off"

This reverts commit 2dc1889e.

Fixes a suspend and resume regression.

bug: https://bugzilla.kernel.org/show_bug.cgi?id=196615Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c

@@ -839,8 +839,6 @@ static int amdgpu_cgs_get_active_displays_info(struct cgs_device *cgs_device,
 
 	mode_info = info->mode_info;
 	if (mode_info) {
-		/* if the displays are off, vblank time is max */
-		mode_info->vblank_time_us = 0xffffffff;
 		/* always set the reference clock */
 		mode_info->ref_clock = adev->clock.spll.reference_freq;
 	}