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drm/i915: Calculate vblank timestamping constants before enabling vblank.

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This is required to properly initialize vblanks on the active crtc.
Without it drm_calc_vbltimestamp_from_scanoutpos can fail with
crtc 0: Noop due to uninitialized mode.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2015-07-14 13:46:40 +02:00 committed by Daniel Vetter
parent 4be40c987a
commit 3a03dfb057
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/intel_display.c
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@ -15239,6 +15239,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc)
/* restore vblank interrupts to correct state */
drm_crtc_vblank_reset(&crtc->base);
if (crtc->active) {
drm_calc_timestamping_constants(&crtc->base, &crtc->base.hwmode);
update_scanline_offset(crtc);
drm_crtc_vblank_on(&crtc->base);
}