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authorMichel Dänzer <michel@tungstengraphics.com>2006-09-01 11:27:14 +0200
committerMichel Dänzer <michel@tungstengraphics.com>2006-09-28 15:41:36 +0200
commit89e323e4900af84cc33219ad24eb0b435a039d23 (patch)
tree6c55c148b5d5981d3e5eaf1d7d8d5afb51da0931 /linux-core
parent7f09f957d9a61ac107f8fd29128d7899a3e8a228 (diff)
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.
Diffstat (limited to 'linux-core')
-rw-r--r--linux-core/drm_irq.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/linux-core/drm_irq.c b/linux-core/drm_irq.c
index fef0e8d4..bd8a9c82 100644
--- a/linux-core/drm_irq.c
+++ b/linux-core/drm_irq.c
@@ -249,8 +249,7 @@ 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) || (!dev->irq_enabled))
return -EINVAL;
@@ -272,12 +271,12 @@ 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;
@@ -285,13 +284,18 @@ 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);