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drm: Refactor vblank sequence number comparison 

Move the repeated (a - b) <= (1 << 23) to its own function.

v2: Catch the '1<<23' inside drm_handle_vblank() as well

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Michel Dänzer <michel@daenzer.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322100650.26082-1-chris@chris-wilson.co.uk
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-03-22 10:06:50 +00:00 committed by Ville Syrjälä
parent 6c06a59703
commit 9a4d9babce
1 changed files with 10 additions and 6 deletions
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16
drivers/gpu/drm/drm_irq.c
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@ -1484,6 +1484,11 @@ int drm_legacy_modeset_ctl(struct drm_device *dev, void *data,
return 0;
}
static inline bool vblank_passed(u32 seq, u32 ref)
{
return (seq - ref) <= (1 << 23);
}
static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
union drm_wait_vblank *vblwait,
struct drm_file *file_priv)
@ -1534,7 +1539,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
vblwait->request.sequence);
e->event.sequence = vblwait->request.sequence;
if ((seq - vblwait->request.sequence) <= (1 << 23)) {
if (vblank_passed(seq, vblwait->request.sequence)) {
drm_vblank_put(dev, pipe);
send_vblank_event(dev, e, seq, &now);
vblwait->reply.sequence = seq;
@ -1624,9 +1629,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
}
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
(seq - vblwait->request.sequence) <= (1 << 23)) {
vblank_passed(seq, vblwait->request.sequence))
vblwait->request.sequence = seq + 1;
}
if (flags & _DRM_VBLANK_EVENT) {
/* must hold on to the vblank ref until the event fires
@ -1639,8 +1643,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
vblwait->request.sequence, pipe);
DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
(drm_vblank_count(dev, pipe) -
vblwait->request.sequence) <= (1 << 23) ||
vblank_passed(drm_vblank_count(dev, pipe),
vblwait->request.sequence) ||
!READ_ONCE(vblank->enabled));
}
@ -1675,7 +1679,7 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
list_for_each_entry_safe(e, t, &dev->vblank_event_list, base.link) {
if (e->pipe != pipe)
continue;
if ((seq - e->event.sequence) > (1<<23))
if (!vblank_passed(seq, e->event.sequence))
continue;
DRM_DEBUG("vblank event on %u, current %u\n",