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| author | Chris Wilson <[email protected]> | 2016-09-06 14:45:38 +0000 |
|---|---|---|
| committer | Chris Wilson <[email protected]> | 2016-09-06 16:51:01 +0000 |
| commit | b18c1bb48eb5911bf99fbc5bf6509d4ae06feb9d (patch) | |
| tree | 9879390f0cb3a47a8135dfcece57f312b4522b9d /drivers/gpu/drm/i915/intel_dp_mst.c | |
| parent | drm/i915: disable 48bit full PPGTT when vGPU is active (diff) | |
| download | kernel-b18c1bb48eb5911bf99fbc5bf6509d4ae06feb9d.tar.gz kernel-b18c1bb48eb5911bf99fbc5bf6509d4ae06feb9d.zip | |
drm/i915: Remove 64b mmio write vfuncs
We don't have safe 64-bit mmio writes as they are really split into
2x32-bit writes. This tearing is dangerous as the hardware *will*
operate on the intermediate value, requiring great care when assigning.
(See, for example, i965_write_fence_reg.) As such we don't currently use
them and strongly advise not to us them. Go one step further and remove
the 64-bit write vfuncs.
v2: Add some more details to the comment about why WRITE64 is absent,
and why you need to think twice before using READ64.
Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Joonas Lahtinen <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp_mst.c')
0 files changed, 0 insertions, 0 deletions