On Tue, Jun 08, 2021 at 11:03:01AM +0200, Thomas Zimmermann wrote: > Replace the IRQ check in VBLANK ioctls with a check for vblank > support. IRQs might be enabled wthout vblanking being supported. Nah, or if they are, that's a broken driver. irq_enabled here really only means vblank_irq_enabled (maybe we should rename it). I'd like to understand the motivation here a bit better to make sure we'r not just papering over a driver bug. Also as-is this breaks legacy drivers, which do enable/disable irqs at runtime with the legacy IRQ_CONTROL ioctl, so we can't just throw this out. Hence this cleanup here is only ok for non-legacy drivers. Finally if you do this cleanup I think we should go through drivers and drop the irq_enabled = true settings that are littered around. For that cleanup I think this patch makes sense. -Daniel > > This change also removes the DRM framework's only dependency on > IRQ state for non-legacy drivers. > > Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> > --- > drivers/gpu/drm/drm_irq.c | 10 +++------- > drivers/gpu/drm/drm_vblank.c | 6 +++--- > 2 files changed, 6 insertions(+), 10 deletions(-) > > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c > index c3bd664ea733..1d7785721323 100644 > --- a/drivers/gpu/drm/drm_irq.c > +++ b/drivers/gpu/drm/drm_irq.c > @@ -74,10 +74,8 @@ > * only supports devices with a single interrupt on the main device stored in > * &drm_device.dev and set as the device paramter in drm_dev_alloc(). > * > - * These IRQ helpers are strictly optional. Drivers which roll their own only > - * need to set &drm_device.irq_enabled to signal the DRM core that vblank > - * interrupts are working. Since these helpers don't automatically clean up the > - * requested interrupt like e.g. devm_request_irq() they're not really > + * These IRQ helpers are strictly optional. Since these helpers don't automatically > + * clean up the requested interrupt like e.g. devm_request_irq() they're not really > * recommended. > */ > > @@ -91,9 +89,7 @@ > * and after the installation. > * > * This is the simplified helper interface provided for drivers with no special > - * needs. Drivers which need to install interrupt handlers for multiple > - * interrupts must instead set &drm_device.irq_enabled to signal the DRM core > - * that vblank interrupts are available. > + * needs. > * > * @irq must match the interrupt number that would be passed to request_irq(), > * if called directly instead of using this helper function. > diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c > index 3417e1ac7918..165286fef478 100644 > --- a/drivers/gpu/drm/drm_vblank.c > +++ b/drivers/gpu/drm/drm_vblank.c > @@ -1748,7 +1748,7 @@ int drm_wait_vblank_ioctl(struct drm_device *dev, void *data, > unsigned int pipe_index; > unsigned int flags, pipe, high_pipe; > > - if (!dev->irq_enabled) > + if (!drm_dev_has_vblank(dev)) > return -EOPNOTSUPP; > > if (vblwait->request.type & _DRM_VBLANK_SIGNAL) > @@ -2023,7 +2023,7 @@ int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data, > if (!drm_core_check_feature(dev, DRIVER_MODESET)) > return -EOPNOTSUPP; > > - if (!dev->irq_enabled) > + if (!drm_dev_has_vblank(dev)) > return -EOPNOTSUPP; > > crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id); > @@ -2082,7 +2082,7 @@ int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data, > if (!drm_core_check_feature(dev, DRIVER_MODESET)) > return -EOPNOTSUPP; > > - if (!dev->irq_enabled) > + if (!drm_dev_has_vblank(dev)) > return -EOPNOTSUPP; > > crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id); > -- > 2.31.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
