Changes v1 -> v2:
- Avoid the GPU sampling from the resource that gets mutated by the the
transfer map by setting DRM_ETNA_PREP_WRITE.
Changes v2 -> v3:
- make use of likely(..)
- drop minor optimization regarding rsc->layout == ETNA_LAYOUT_LINEAR
- better documentation why DRM_ETNA_PREP_WRITE is needed
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
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