tree bea8f5d6328d1325e9fa20f0fc756ea442471ce0
parent 0555f6db15b61a99e5091d6826fb6fb67d9661c8
author Daniel Stone <daniels@collabora.com> 1552409779 +0000
committer Daniel Stone <daniels@collabora.com> 1554138439 +0100

EXT_image_dma_buf_import_modifiers: Correct no-modifier-token behaviour

Zero is a valid and explicit modifier token, meaning that the image is
pitch-linear, i.e. no tiling or compression is applied.

When no modifier is passed for dmabuf import, the implementation may
assume the image is linear, but is not required to do so. Many drivers
which supported tiling formats before modifiers (or which do not yet
support modifiers) will determine the layout via other mechanisms, e.g.
metadata held by the kernel.

Fix the wording for the case where the user does not explicitly pass
modifiers to state that the layout will be determined by the
implementation, rather than stating the layout must be linear.

Reported by @olvaffe