[Intel-gfx] [PATCH] drm/i915: Skip CPU synchronisation on dmabuf attachments

[Dongwon Kim]

The patch is here:
https://lists.freedesktop.org/archives/intel-gfx/2017-November/148988.html

On Mon, Feb 10, 2020 at 11:34:07AM -0800, Dongwon Kim wrote:
> Acked-by: Dongwon Kim <dongwon.kim at intel.com>
> 
> It makes lots of sense to make CPU cache operation done only when
> needed. Similar change was already landed in drm-prime and other
> vendor specific drivers. We are actually seeing huge performance
> boost in a specific customer case where dmabuf was used between
> camera driver (importer) and i915 after applying this patch.
> 
> Please consider upstreaming this code change.