[Intel-gfx] [PATCH] drm/i915: Return early when pipes are not available

[Mika Kahola]

On Thu, 2017-11-09 at 11:01 +0000, Chris Wilson wrote:
> Quoting Mika Kahola (2017-11-09 10:49:52)
> > 
> > At least in Coffee Lake it happens that we start initiliazing audio
> > when
> > no display is connected. This was discovered by CI when running IGT
> > test
> > case
> > 
> > drv_module_reload --r basic-no-display
> > 
> > The issue here is that the 'intel_device_info_runtime_init()' sets
> > num_pipes to 0 but before this happens the audio part has already
> > started
> > to initialize itself. Later on the num_pipes is updated to 0 in
> > intel_device_info_runtime_init() and we hit that when audio part is
> > digging
> > out ELD. This causes a warning in dmesg. To fix this issue, let's
> > check the
> > number of available pipes when trying to read out ELD.
> dev_info_runtime_init() is too late. It depends on mmio being enabled
> to
> probe the HW and nothing else; so move it to i915_driver_init_mmio()?
Ok. I could try that. I was also thinking that is there a way to
postpone audio initialization?

> -Chris
-- 
Mika Kahola - Intel OTC