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drm/tegra: Don't use vblank_disable_immediate on incapable driver.
Tegra would not only need a hardware vblank counter that increments at leading edge of vblank, but also support for instantaneous high precision vblank timestamp queries, ie. a proper implementation of dev->driver->get_vblank_timestamp(). Without these, there can be off-by-one errors during vblank disable/enable if the scanout is inside vblank at en/disable time, and additionally clients will never see any useable vblank timestamps when querying via drmWaitVblank ioctl. This would negatively affect swap scheduling under X11 and Wayland. Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -173,7 +173,6 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
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drm->irq_enabled = true;
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/* syncpoints are used for full 32-bit hardware VBLANK counters */
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drm->vblank_disable_immediate = true;
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drm->max_vblank_count = 0xffffffff;
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err = drm_vblank_init(drm, drm->mode_config.num_crtc);
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