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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>
This commit is contained in:
=?utf-8?q?Michel_D=C3=A4nzer?= 2006-10-24 23:34:18 +10:00 committed by airlied
parent 8163e418f7
commit ab285d74e6
2 changed files with 13 additions and 7 deletions
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4
drivers/char/drm/drm.h
View File

@ -487,12 +487,14 @@ typedef struct drm_irq_busid {
typedef enum {
_DRM_VBLANK_ABSOLUTE = 0x0, /**< Wait for specific vblank sequence number */
_DRM_VBLANK_RELATIVE = 0x1, /**< Wait for given number of vblanks */
_DRM_VBLANK_NEXTONMISS = 0x10000000, /**< If missed, wait for next vblank */
_DRM_VBLANK_SECONDARY = 0x20000000, /**< Secondary display controller */
_DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking */
} drm_vblank_seq_type_t;
#define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)
#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY)
#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | \
_DRM_VBLANK_NEXTONMISS)
struct drm_wait_vblank_request {
drm_vblank_seq_type_t type;

16
drivers/char/drm/drm_irq.c
View File

@ -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);