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    SubjectRe: [PATCH 1/2] drm: Introduce crtc->mode_valid() callback
    On Wed, May 3, 2017 at 5:21 PM, Ville Syrjälä
    <ville.syrjala@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

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