On Monday, June 11, 2007 6:42:09 Keith Packard wrote:
> On Mon, 2007-06-11 at 15:20 -0700, Jesse Barnes wrote:
> > +static u32 last_vblank; /* protected by dev->vbl_lock */
>
> uh. per crtc?
Oh, hm yeah. I guess it'll have to go in drm_device.
> > + atomic_add(diff, &dev->vblank_count[crtc]);
>
> Ok, I think this is reasonable, although different from what I
> suggested.
This is just wraparound handling.
> > + seq = atomic_read(&dev->vblank_count[crtc]);
>
> Isn't this way too early? Seems like you'd want to get a reasonably
> up-to-date value here; should this be after drm_vblank_get?
Oh you're right about that, otherwise we'll end up with lots of events in the
past.
>
> > +u32 i915_get_vblank_counter(drm_device_t *dev, int crtc)
> > +{
> > + drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
> > + return i915_vblank_counter(dev, crtc) + dev_priv->vblank_offset[crtc];
> > +}
>
> I thought you were doing the offset stuff in core?
I thought about it, but if I did, it would require lots of DDX changes I
think? Dave convinced me it should actually be a driver specific SETPARAM,
so after posting this patch I converted to that interface.
> > +
> > +int i915_premodeset(DRM_IOCTL_ARGS)
> > +{
> > + DRM_DEVICE;
> > + drm_i915_private_t *dev_priv = dev->dev_private;
> > +
> > + int crtc = data;
> > +
> > + if (crtc > 1) {
> > + DRM_ERROR("bad crtc\n");
> > + return -EINVAL;
> > + }
> > +
> > + dev_priv->vblank_premodeset[crtc] = i915_vblank_counter(dev, crtc);
> > + return 0;
> > +}
> > +
> > +int i915_postmodeset(DRM_IOCTL_ARGS)
> > +{
> > + DRM_DEVICE;
> > + drm_i915_private_t *dev_priv = dev->dev_private;
> > + u32 new;
> > + int crtc = data;
> > +
> > + if (crtc > 1) {
> > + DRM_ERROR("bad crtc\n");
> > + return -EINVAL;
> > + }
> > +
> > + new = i915_vblank_counter(dev, crtc);
> > + dev_priv->vblank_offset[crtc] = dev_priv->vblank_premodeset[crtc] -
> > new; + return 0;
> > +}
>
> Ah, ok, offsets in driver.
Since most drivers don't do randr-1.2 yet, poking around in their modesetting
code to make a generic DRM call seemed like overkill. I think a per-driver
setparam will get away from this, though either way we'll be stuck with a
dead interface once kernel modesetting is ready.
Jesse
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