drm/i915: Handle cursor updating active_planes correctly, v2.
While we may not update new_crtc_state, we may clear active_planes if the new cursor update state will disable the cursor, but we fail after. If this is immediately followed by a modeset disable, we may soon not disable the planes correctly when we start depending on active_planes. Changes since v1: - Clarify why we cannot swap crtc_state. (Matt) Signed-off-by:Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by:
Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180920102711.4184-3-maarten.lankhorst@linux.intel.com
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