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drm: Allow vblank support without DRIVER_HAVE_IRQ 

Drivers that register interrupt handlers without the DRM core helpers
don't initialize the .irq_enabled field and drm_dev_to_irq() may fail
when called on them. This shouldn't preclude them from implementing
the vblank IOCTL.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Thierry Reding 2013-01-14 16:05:56 +00:00 committed by Dave Airlie
parent 1e6d17a5df
commit 03f6509df9
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/drm_irq.c
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@ -1218,8 +1218,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
int ret;
unsigned int flags, seq, crtc, high_crtc;
if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
return -EINVAL;
if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
return -EINVAL;
if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
return -EINVAL;