drm/i915/gtt: add some flushing for the 64K GTT path

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If we need to mark the PDE as operating in 64K GTT mode, we should be
paranoid and flush the extra writes, like we already do for the PTEs. On
some platforms the clflush can apparently add the just the right amount
of magical delay to force the GPU to see the updated entry.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210903155317.1854012-1-matthew.auld@intel.com

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Matthew Auld 2021-09-03 16:53:17 +01:00

parent 3f027d6166

commit 502d0609fc

1 changed files with 2 additions and 0 deletions

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drivers/gpu/drm/i915/gt/gen8_ppgtt.c

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