[PATCH v3 10/11] drm: Use state helper instead of the plane state pointer

[Stephen Boyd]

Quoting Maxime Ripard (2021-03-30 08:35:27)
> Hi Stephen,
> 
> On Mon, Mar 29, 2021 at 06:52:01PM -0700, Stephen Boyd wrote:
> > Trimming Cc list way down, sorry if that's too much.
> > 
> > Quoting Maxime Ripard (2021-02-19 04:00:30)
> > > Many drivers reference the plane->state pointer in order to get the
> > > current plane state in their atomic_update or atomic_disable hooks,
> > > which would be the new plane state in the global atomic state since
> > > _swap_state happened when those hooks are run.
> > 
> > Does this mean drm_atomic_helper_swap_state()?
> 
> Yep. Previous to that call in drm_atomic_helper_commit, plane->state is
> the state currently programmed in the hardware, so the old state (that's
> the case you have with atomic_check for example)
> 
> Once drm_atomic_helper_swap_state has run, plane->state is now the state
> that needs to be programmed into the hardware, so the new state.

Ok, and I suppose that is called by drm_atomic_helper_commit()? So
presumably a modeset is causing this? I get the NULL pointer around the
time we switch from the splash screen to the login screen. I think
there's a modeset during that transition.