[PATCH 1/2] drm: Introduce crtc->mode_valid() callback

[Daniel Vetter]

On Wed, May 3, 2017 at 5:21 PM, Ville Syrjälä
<ville.syrjala at linux.intel.com> wrote:
> We don't actually want the codepaths to match exactly. In i915
> we allow the user to exceed some of the display/dongle limits
> because those things often tell us that something shouldn't work
> when in fact it does. And some users are quick to complain if
> something stops working for them.

The goal here is to share the source-side checking
(crtc/encoder/bridges), and that should match perfectly between probe
and commit. Sink-side constraints are different, and for those we
should indeed not check everything. Maybe a good reason to only call
connector->mode_valid in the probe paths?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch