[Intel-gfx] [3.14.0-rc4] regression: drm FIFO underruns

[Jörg Otte]

2014-05-13 15:22 GMT+02:00 Daniel Vetter <daniel at ffwll.ch>:
> On Tue, May 13, 2014 at 12:38:41PM +0200, Daniel Vetter wrote:
>> On Tue, May 13, 2014 at 12:29 PM, Jörg Otte <jrg.otte at gmail.com> wrote:
>> >>> Branch drm-intel-nightly as of
>> >>> ed60c27 drm-intel-nightly: 2014y-05m-09d-21h-51m-45s integration manifest
>> >>> looks badly:
>> >>>    - KDE splash screen on boot-up is not visible
>> >>>    - x-windows don't have title and menu bars
>> >>>    - KDE system menu is not visible
>> >>>    - moving windows around destroys its content
>> >>
>> >> Ugh, that's ugly. Nothing else change like e.g. the version of
>> >> xfree-video-intel?
>> >
>> >  (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
>> >  (II) Module intel: vendor="X.Org Foundation"
>> >  compiled for 1.11.3, module version = 2.17.0
>> >  Module class: X.Org Video Driver
>> >  ABI class: X.Org Video Driver, version 11.0
>>
>> Chris, any ideas? It's an ivybridge apparently.
>>
>> For the fifo underruns I think we've fully confirmed that they only
>> happen on boot-up. I'll try to come up with some ideas what could have
>> gone wrong there.
>
> Please test the below patch.
> -Daniel
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index b10fbde1d5ee..63ced2dee027 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -427,9 +427,6 @@ bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
>
>         ret = !intel_crtc->cpu_fifo_underrun_disabled;
>
> -       if (enable == ret)
> -               goto done;
> -
>         intel_crtc->cpu_fifo_underrun_disabled = !enable;
>
>         if (enable && (INTEL_INFO(dev)->gen < 5 || IS_VALLEYVIEW(dev)))
> @@ -441,7 +438,6 @@ bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
>         else if (IS_GEN8(dev))
>                 broadwell_set_fifo_underrun_reporting(dev, pipe, enable);
>
> -done:
>         return ret;
>  }
>
> --

Doesn't work for me, I still have an underrun at boot-up.

Thanks, Jörg