drm/i915/gem: Prevent using pgprot_writecombine() if PAT is not supported

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Let's not try and use PAT attributes for I915_MAP_WC if the CPU doesn't
support PAT.

Fixes: 6056e50033 ("drm/i915/gem: Support discontiguous lmem object maps")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v5.6+
Link: https://patchwork.freedesktop.org/patch/msgid/20200915091417.4086-2-chris@chris-wilson.co.uk
(cherry picked from commit 121ba69ffd)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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Chris Wilson 2020-09-15 10:14:16 +01:00 • committed by Rodrigo Vivi

parent 4caf017ee9

commit ba2ebf605d

1 changed files with 4 additions and 0 deletions

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drivers/gpu/drm/i915/gem/i915_gem_pages.c

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