[Intel-gfx] [PATCH 3/5] drm/i915: Enable vblanks after verifying power domain states.

[Maarten Lankhorst]

Op 04-01-18 om 22:51 schreef Pandiyan, Dhinakaran:
> On Thu, 2018-01-04 at 12:35 +0100, Maarten Lankhorst wrote:
>> Wouldn't it be better to make intel_power_domains_verify_state work
>> correctly with the vblank irq?
> I tried to :) Since I changed the domain_use_count to atomic_t and moved
> it outside of the locks, verify_state became racy. Let me take another
> look.
>
> -DK

It sucks that we end up with 2 ways to handle power domains..

I'm trying to think of a cleaner way, coming up with none. :(

It would have been nice if we could do something like a seqlock for
the refcounts, but that would prevent us from blocking too..

Is it only the DC off power well we care about?

~Maarten