On Wed, May 14, 2014 at 08:51:06PM +0200, Daniel Vetter wrote: > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > > drm_vblank_off() will turn off vblank interrupts, but as long as the > refcount is elevated drm_vblank_get() will not re-enable them. This > is a problem is someone is holding a vblank reference while a modeset is > happening, and the driver requires vblank interrupt to work during that > time. > > Add drm_vblank_on() as a counterpart to drm_vblank_off() which will > re-enabled vblank interrupts if the refcount is already elevated. This > will allow drivers to choose the specific places in the modeset sequence > at which vblank interrupts get disabled and enabled. > > Testcase: igt/kms_flip/*-vs-suspend > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com> > [danvet: Add Testcase tag for the igt I've written.] > Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> > --- > drivers/gpu/drm/drm_irq.c | 72 > ++++++++++++++++++++++++++---------- > drivers/gpu/drm/i915/intel_display.c | 8 ++++ > include/drm/drmP.h | 1 + > 3 files changed, 62 insertions(+), 19 deletions(-) > > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c > index 13d671ed3421..dd786d84daab 100644 > --- a/drivers/gpu/drm/drm_irq.c > +++ b/drivers/gpu/drm/drm_irq.c > @@ -840,6 +840,41 @@ static void drm_update_vblank_count(struct drm_device > *dev, int crtc) > } > > /** > + * drm_vblank_enable - enable the vblank interrupt on a CRTC > + * @dev: DRM device > + * @crtc: CRTC in question > + */
Perhaps the kernel-doc here should contain some of what's described in
the commit message? Also a "Return:" section would be useful here to
specify what's an error and what isn't.
> +static int drm_vblank_enable(struct drm_device *dev, int crtc)
On second thought, since this is a local function, my comments above
apply to drm_vblank_on() below rather than drm_vblank_enable().
> +{
> + int ret = 0;
> +
> + assert_spin_locked(&dev->vbl_lock);
> +
> + spin_lock(&dev->vblank_time_lock);
> +
> + if (!dev->vblank[crtc].enabled) {
> + /* Enable vblank irqs under vblank_time_lock protection.
> + * All vblank count & timestamp updates are held off
> + * until we are done reinitializing master counter and
> + * timestamps. Filtercode in drm_handle_vblank() will
> + * prevent double-accounting of same vblank interval.
> + */
Coding style:
/*
* Enable...
*/
?
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
Perhaps split off the i915 changes into a separate patch?
Thierry
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