[PATCH] drm/rockchip: support prime fd import

[Emil Velikov]

On 23 February 2016 at 23:56, Rob Clark <robdclark at gmail.com> wrote:
> On Tue, Feb 23, 2016 at 6:29 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>> Hi Zach,
>>
>> On 2 February 2016 at 23:37, Zach Reizner <zachr at google.com> wrote:
>>> The prime fd to handle ioctl was not used with rockchip before. Support
>>> was added in order to support potential uses (e.g. zero-copy video
>>> decode, camera).
>>>
>> Similar patch came around a few months ago and got this reply [1]. If
>> the situation has changed (there is an open-source driver/user for
>> this) it should be clearly mentioned in the commit message, as opposed
>> to "in order to support potential uses".
>
> hmm, well it is not driver specific uabi, and we have let several
> other mali/img users do prime..
>
> I'm not sure, maybe those platforms can do a basic v4l <-> display
> thing w/ prime.  Although upstream tends to hurt a bit for camera
> support..
>
Actually... one possible user is vgem. With the series from Tiago
"Direct userspace dma-buf mmap" hitting upstream, we can actually
reapply the problematic parts of vgem, and get this in as well.

Hopefully echoing the slogan "upstream kernel needs users for
interfaces", did not come too much for people.
If it did, sorry but it's a rule which was set before I came along.

Regards,
Emil