[PATCH 16/37] drm/hdlcd|mali: Drop drm_vblank_cleanup

[Daniel Vetter]

On Wed, May 31, 2017 at 1:22 PM, Liviu Dudau <liviu.dudau at arm.com> wrote:
> On Wed, May 31, 2017 at 01:03:34PM +0200, Daniel Vetter wrote:
>> On Wed, May 31, 2017 at 12:57 PM, Liviu Dudau <liviu.dudau at arm.com> wrote:
>> > On Wed, May 24, 2017 at 04:51:51PM +0200, Daniel Vetter wrote:
>> >> IRQs are properly shut down, so it almost works as race-free shutdown.
>> >> Except the irq is stopped after the vblank stuff, so boom anyway.
>> >> Proper way would be to call drm_atomic_helper_shutdown before any of
>> >> the kms things gets stopped. So no harm in removing the
>> >> drm_vblank_cleanup here really.
>> >
>> > Slightly confused on the implied message in the commit text: is "Proper way
>> > would be to call drm_atomic_helper_shutdown" a hint? A promise of a future
>> > patch? A message to the future us on how to fix things if they blow up?
>> >
>> > If calling drm_atomic_helper_shutdown() is the proper thing to do, why does the
>> > patch (and the series) avoids doing that? Lack of understanding of the driver's
>> > internal workings? Then I want to help, if I can understand the new direction.
>>
>> Yes, I wanted to not make things worse. If you look at the overall
>> result (especially last patch) I'm also trying to better document
>> stuff in the vblank area, but summarized, if you want to make sure
>> that vblank processing has stopped, you need to call drm_vblank_off on
>> each active crtc. The simplest way to get that is by using
>> drm_atomic_helper_shutdown(). Calling drm_vblank_cleanup doesn't
>> really do anything useful (see the last patch for the only valid
>> usecase there ever was).
>
> OK, so there should be a follow up patch adding drm_atomic_helper_shutdown(). I guess
> I need to call dibs on it? :)

I googled what "to call dibs on smth" means and still can't figure out
what you mean here. Can you pls explain?

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch