drm/i915/fbc: Don't set an illegal fence if unfenced

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If the frontbuffer doesn't have an associated fence, it will have a
fence reg of -1. If we attempt to OR in this register into the FBC
control register we end up setting all control bits, oops!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: "Zanoni, Paulo R" <paulo.r.zanoni@intel.com>
Reviwed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160819155428.1670-2-chris@chris-wilson.co.uk

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Chris Wilson 2016-08-19 16:54:24 +01:00

parent 4fc788f5ee

commit 12ecf4b979

1 changed files with 32 additions and 16 deletions

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drivers/gpu/drm/i915/intel_fbc.c

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