Commit ff683df7 authored by Mario Kleiner's avatar Mario Kleiner Committed by Dave Airlie

drm/nouveau/display: Enable vblank irqs after display engine is on again.

In the display resume path, move the calls to drm_vblank_on()
after the point when the display engine is running again.

Since changes were made to drm_update_vblank_count() in Linux 4.4+
to emulate hw vblank counters via vblank timestamping, the function
drm_vblank_on() now needs working high precision vblank timestamping
and therefore working scanout position queries at time of call.
These don't work before the display engine gets restarted, causing
miscalculation of vblank counter increments and thereby large forward
jumps in vblank count at display resume. These jumps can cause client
hangs on resume, or desktop hangs in the case of composited desktops.

Fix this Linux 4.4 regression by reordering calls accordingly.
Signed-off-by: default avatarMario Kleiner <mario.kleiner.de@gmail.com>
Cc: <stable@vger.kernel.org> # 4.4+
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: ville.syrjala@linux.intel.com
Cc: daniel.vetter@ffwll.ch
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent e0b34e38
...@@ -635,10 +635,6 @@ nouveau_display_resume(struct drm_device *dev, bool runtime) ...@@ -635,10 +635,6 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
nv_crtc->lut.depth = 0; nv_crtc->lut.depth = 0;
} }
/* Make sure that drm and hw vblank irqs get resumed if needed. */
for (head = 0; head < dev->mode_config.num_crtc; head++)
drm_vblank_on(dev, head);
/* This should ensure we don't hit a locking problem when someone /* This should ensure we don't hit a locking problem when someone
* wakes us up via a connector. We should never go into suspend * wakes us up via a connector. We should never go into suspend
* while the display is on anyways. * while the display is on anyways.
...@@ -648,6 +644,10 @@ nouveau_display_resume(struct drm_device *dev, bool runtime) ...@@ -648,6 +644,10 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
drm_helper_resume_force_mode(dev); drm_helper_resume_force_mode(dev);
/* Make sure that drm and hw vblank irqs get resumed if needed. */
for (head = 0; head < dev->mode_config.num_crtc; head++)
drm_vblank_on(dev, head);
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc); struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
......
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