On Wed, May 03, 2017 at 05:09:08PM +0300, Ville Syrjälä wrote:
> On Wed, May 03, 2017 at 09:26:38AM +0200, Daniel Vetter wrote:
> > In the previous patch we've implemented hwmode tracking a la i915 for
> > the vblank timestamp calculations. But that was just the basic
> > semantics, i915 has some nice sanity checks to make sure we keep
> > getting this right. Move them over too.
> >
> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_irq.c | 8 +++++++-
> > drivers/gpu/drm/i915/i915_irq.c | 10 ++++++----
> > drivers/gpu/drm/i915/intel_display.c | 11 ++---------
> > 3 files changed, 15 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> > index 89f0928b042a..942183a2aa3c 100644
> > --- a/drivers/gpu/drm/drm_irq.c
> > +++ b/drivers/gpu/drm/drm_irq.c
> > @@ -775,8 +775,10 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> > /* If mode timing undefined, just return as no-op:
> > * Happens during initial modesetting of a crtc.
> > */
> > - if (mode->crtc_clock == 0) {
> > + if (WARN_ON(mode->crtc_clock == 0)) {
> > DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
> > + WARN_ON(drm_drv_uses_atomic_modeset(dev));
>
> I would make these _ONCE() otherwise the machine might end up
> practically dead.
Will do.
> > +
> > return false;
> > }
> >
> > @@ -1338,6 +1340,10 @@ void drm_crtc_vblank_off(struct drm_crtc *crtc)
> > send_vblank_event(dev, e, seq, &now);
> > }
> > spin_unlock_irqrestore(&dev->event_lock, irqflags);
> > +
> > + /* Will be reset by the modeset helpers when re-enabling the crtc by
> > + * calling drm_calc_timestamping_constants(). */
> > + vblank->hwmode.crtc_clock = 0;
> > }
> > EXPORT_SYMBOL(drm_crtc_vblank_off);
>
> Shouldn't we do this in drm_crtc_vblank_reset() as well?
>
> Hmm. Except we call that after drm_calc_timestamping_constants(). I
> guess we should be able to move the reset() into
> intel_modeset_readout_hw_state(). And possibly move the vblank_on()
> call as well?
Yeah, it'd be nice to clean this stuff up some more, but there's also the
problem that legacy and new drivers callc drm_calc_timestamping_constants
at opposite ends of the modeset sequence. Doing more here is a bunch more
work, maybe for the next patche series ...
I don't think we need to call it in _reset, at least at boot-up it should
be 0 already. And for s/r we already shut down the pipe on suspend, so
it's gone through this here.
With the _ONCE nit address (and the build breakage I've introduced in this
version fixed), ack from you on the entire series?
Thanks, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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