[Intel-gfx] [PATCH 0/9] drm: More vblank on/off work

[Jesse Barnes]

On Mon, 26 May 2014 14:46:23 +0300
ville.syrjala at linux.intel.com wrote:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Another vblank series with the following features:
> - Plug a race between drm_vblank_off() and marking the crtc inactive
> - Don't send zeroed vblank evens to userspace at drm_vblank_off()
> - Have the user visible vblank counter account the entire time
>   when the crtc was active, regardless of how long vblank interrupts
>   were enabled
> - Avoid random jumps in the user visible vblank counter if the hardware
>   counter gets reset
> - Allow disabling vblank interrupts immediately at drm_vblank_put()
> - Some polish via coccinelle
> 
> While setting drm_vblank_offdelay to 0 is now possible, I'm not sure
> if we should set it 0 automatically in the i915 driver. If there are
> multiple GPUs in the system that setting will affect them all, which
> might have bad consequences if the other GPU doesn't have a hardware
> frame counter, or if it's just buggy. So perhaps we should move that
> option to be per-driver?
> 
> Ville Syrjälä (9):
>   drm: Always reject drm_vblank_get() after drm_vblank_off()
>   drm/i915: Warn if drm_vblank_get() still works after drm_vblank_off()
>   drm: Don't clear vblank timestamps when vblank interrupt is disabled
>   drm: Move drm_update_vblank_count()
>   drm: Have the vblank counter account for the time between vblank irq
>     disable and drm_vblank_off()
>   drm: Avoid random vblank counter jumps if the hardware counter has
>     been reset
>   drm: Disable vblank interrupt immediately when drm_vblank_offdelay==0
>   drm: Reduce the amount of dev->vblank[crtc] in the code
>   drm/i915: Leave interrupts enabled while disabling crtcs during
>     suspend

Here's one that may be fixed by this series, needs testing though:
https://bugs.freedesktop.org/show_bug.cgi?id=79054

-- 
Jesse Barnes, Intel Open Source Technology Center