diff options
| author | =?utf-8?q?Michel_D=C3=A4nzer?= <michel@tungstengraphics.com> | 2006-10-24 23:34:18 +1000 |
|---|---|---|
| committer | airlied <airlied@linux.ie> | 2006-12-07 15:53:29 +1100 |
| commit | ab285d74e6742422fd0465577a31fb03fe9ed241 (patch) | |
| tree | 172d9731b6288751478fd25d985aefb90f7c41bf /drivers/char/drm/drm_irq.c | |
| parent | 8163e418f71e46a28bac6625b4c633c13bd53c8d (diff) | |
drm: Core vsync: Add flag DRM_VBLANK_NEXTONMISS.
When this flag is set and the target sequence is missed, wait for the next
vertical blank instead of returning immediately.
Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/char/drm/drm_irq.c')
| -rw-r--r-- | drivers/char/drm/drm_irq.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/char/drm/drm_irq.c b/drivers/char/drm/drm_irq.c index b08608a9f026..78aae5b35c62 100644 --- a/drivers/char/drm/drm_irq.c +++ b/drivers/char/drm/drm_irq.c @@ -250,8 +250,7 @@ int drm_wait_vblank(DRM_IOCTL_ARGS) drm_wait_vblank_t vblwait; struct timeval now; int ret = 0; - unsigned int flags; - atomic_t *seq; + unsigned int flags, seq; if (!dev->irq) return -EINVAL; @@ -273,12 +272,12 @@ int drm_wait_vblank(DRM_IOCTL_ARGS) DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL)) return -EINVAL; - seq = (flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 : - &dev->vbl_received; + seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 + : &dev->vbl_received); switch (vblwait.request.type & _DRM_VBLANK_TYPES_MASK) { case _DRM_VBLANK_RELATIVE: - vblwait.request.sequence += atomic_read(seq); + vblwait.request.sequence += seq; vblwait.request.type &= ~_DRM_VBLANK_RELATIVE; case _DRM_VBLANK_ABSOLUTE: break; @@ -286,13 +285,18 @@ int drm_wait_vblank(DRM_IOCTL_ARGS) return -EINVAL; } + if ((flags & _DRM_VBLANK_NEXTONMISS) && + (seq - vblwait.request.sequence) <= (1<<23)) { + vblwait.request.sequence = seq + 1; + } + if (flags & _DRM_VBLANK_SIGNAL) { unsigned long irqflags; drm_vbl_sig_t *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_sigs2 : &dev->vbl_sigs; drm_vbl_sig_t *vbl_sig; - vblwait.reply.sequence = atomic_read(seq); + vblwait.reply.sequence = seq; spin_lock_irqsave(&dev->vbl_lock, irqflags); |