[Intel-gfx] [RFC] i915: make the probe asynchronous
Takashi Iwai
tiwai at suse.de
Thu Jul 12 06:56:42 UTC 2018
On Thu, 12 Jul 2018 08:54:34 +0200,
Daniel Vetter wrote:
>
> On Thu, Jul 12, 2018 at 09:29:01AM +0800, Feng Tang wrote:
> > On Tue, Jun 26, 2018 at 10:29:16AM +0800, Feng Tang wrote:
> > > On Mon, Jun 25, 2018 at 05:36:32PM +0200, Daniel Vetter wrote:
> >
> > > Hi Daneil/Jani/Takashi,
> > >
> > > When I was testing this patch from Takashi, I further checked the kernel
> > > module code, and found that: we may need NOT to add any new codes to
> > > prepare for i915's async probe feature!
> > >
> > > Say when i915 module is being loader due to HDA's request_module() call,
> > > in the callchain, do_init_module() has such code:
> > >
> > > if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC))
> > > async_synchronize_full();
> > >
> > > This will garantee the asynced probe is done before it returns.
> > >
> > > I have just tested and this seems to be enough. If I am not wrong, then
> > > we can take the i915 async patch directly. What do you think?
> >
> > Ping for comments, thanks!
>
> Ram (who's working on the hdcp2 code) just learned the hard way that if
> i915 registration gets delayed then audio fails to load. So if you want to
> make i915 fully async, then you _must_ fix the audio load stuff.
Does my component completion patch help for that scenario?
Takashi
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