On Tue, May 20, 2014 at 03:38:14PM +0200, Daniel Vetter wrote: > On Tue, May 20, 2014 at 03:03:41PM +0300, Ville Syrjälä wrote: > > On Wed, May 14, 2014 at 08:51:11PM +0200, Daniel Vetter wrote: > > > Now that we unconditionally dtrt when disabling/enabling crtcs we > > > don't need any hacks any longer to keep the vblank logic sane when > > > all the registers go poof. So let's rip it all out. > > > > Hmm. drm_update_vblank_count() will now see some kind of diff between > > the last and current value when the registers got cloberred. So the > > vblank counter reported to userspace will jump. But I guess that's fine > > as long as userspace realizes that the counter is not at all reliable > > across modesets. > > I've added checks for this (the rpm varianst) and for the similiar > suspend/resume issues (the suspend variants) to kms_flip. It seems to work > and we don't actually jump to far. But maybe the tests are horribly > broken.
Hmm. If we can force the power well off at the start of the test and then set a mode, I'd expect the vblank counter to jump by almost max_vblank_count since the hw counter would appear to wrap. > > Can you please take a closer look? I've thought that the entire point of > this series (well, one of them) was to finally fix this gag and avoid > handing totally bogus frame counter values to userspace. Especially for > system suspend/resume where userspace might get susprised ... I was mostly interested in making vblank interrupts work during plane enable/disable. Anything else is a bonus. > -Daniel > > > > > > > > > This essentially undoes > > > > > > commit 9dbd8febb4dbc9199fcf340b882eb930e36b65b6 > > > Author: Paulo Zanoni <paulo.r.zan...@intel.com> > > > Date: Tue Jul 23 10:48:11 2013 -0300 > > > > > > drm/i915: update last_vblank when disabling the power well > > > > > > Apparently igt/kms_flip is already powerful enough to exercise this > > > properly, yay! See the reference regression report for details. > > > > > > References: https://bugs.freedesktop.org/show_bug.cgi?id=66808 > > > Testcase: igt/kms_flip/*-vs-rpm > > > Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> > > > --- > > > drivers/gpu/drm/i915/intel_pm.c | 34 ---------------------------------- > > > 1 file changed, 34 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/i915/intel_pm.c > > > b/drivers/gpu/drm/i915/intel_pm.c > > > index 75c1c766b507..45fa43f16bb3 100644 > > > --- a/drivers/gpu/drm/i915/intel_pm.c > > > +++ b/drivers/gpu/drm/i915/intel_pm.c > > > @@ -5423,33 +5423,6 @@ static void hsw_power_well_post_enable(struct > > > drm_i915_private *dev_priv) > > > } > > > } > > > > > > -static void reset_vblank_counter(struct drm_device *dev, enum pipe pipe) > > > -{ > > > - assert_spin_locked(&dev->vbl_lock); > > > - > > > - dev->vblank[pipe].last = 0; > > > -} > > > - > > > -static void hsw_power_well_post_disable(struct drm_i915_private > > > *dev_priv) > > > -{ > > > - struct drm_device *dev = dev_priv->dev; > > > - enum pipe pipe; > > > - unsigned long irqflags; > > > - > > > - /* > > > - * After this, the registers on the pipes that are part of the power > > > - * well will become zero, so we have to adjust our counters according to > > > - * that. > > > - * > > > - * FIXME: Should we do this in general in drm_vblank_post_modeset? > > > - */ > > > - spin_lock_irqsave(&dev->vbl_lock, irqflags); > > > - for_each_pipe(pipe) > > > - if (pipe != PIPE_A) > > > - reset_vblank_counter(dev, pipe); > > > - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); > > > -} > > > - > > > static void hsw_set_power_well(struct drm_i915_private *dev_priv, > > > struct i915_power_well *power_well, bool enable) > > > { > > > @@ -5478,8 +5451,6 @@ static void hsw_set_power_well(struct > > > drm_i915_private *dev_priv, > > > I915_WRITE(HSW_PWR_WELL_DRIVER, 0); > > > POSTING_READ(HSW_PWR_WELL_DRIVER); > > > DRM_DEBUG_KMS("Requesting to disable the power well\n"); > > > - > > > - hsw_power_well_post_disable(dev_priv); > > > } > > > } > > > } > > > @@ -5646,11 +5617,6 @@ static void vlv_display_power_well_disable(struct > > > drm_i915_private *dev_priv, > > > valleyview_disable_display_irqs(dev_priv); > > > spin_unlock_irq(&dev_priv->irq_lock); > > > > > > - spin_lock_irq(&dev->vbl_lock); > > > - for_each_pipe(pipe) > > > - reset_vblank_counter(dev, pipe); > > > - spin_unlock_irq(&dev->vbl_lock); > > > - > > > vlv_set_power_well(dev_priv, power_well, false); > > > } > > > > > > -- > > > 1.8.3.1 > > > > > > _______________________________________________ > > > Intel-gfx mailing list > > > Intel-gfx@lists.freedesktop.org > > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx > > > > -- > > Ville Syrjälä > > Intel OTC > > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - http://blog.ffwll.ch -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
