[Bug 103047] lighting render issue with i965 on SKL+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103047

--- Comment #17 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit b77422f80337d363eed60c8c48db9cb6e33085c9
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Fri Jun 15 20:06:05 2018 +0100

    drm/i915: Enable provoking vertex fix on Gen9 systems.

    The SF and clipper units mishandle the provoking vertex in some cases,
    which can cause misrendering with shaders that use flat shaded inputs.

    There are chicken bits in 3D_CHICKEN3 (for SF) and FF_SLICE_CHICKEN
    (for the clipper) that work around the issue.  These registers are
    unfortunately not part of the logical context (even the power context),
    and so we must reload them every time we start executing in a context.

    Bugzilla: https://bugs.freedesktop.org/103047
    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180615190605.16238-1-chris@chris-wilson.co.uk
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Cc: stable at vger.kernel.org

will land first in v4.19 / v4.18 and we'll backport as far as people ask.

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