Can kmssink run with x11 or wayland which is based on drm/kms also?

[Jacob Chen]

Hi,


2017-07-13 9:23 GMT+08:00 Jacob Chen <jacob-chen at iotwrt.com>:
> Hi,
>
> 2017-07-13 1:34 GMT+08:00 Nicolas Dufresne <nicolas at ndufresne.ca>:
>> Le mardi 11 juillet 2017 à 23:17 -0700, jared Hu a écrit :
>>> Hi,
>>>
>>> I met a problem, if I run kmssink on wayland or x11 backend. Kmssink will
>>> report Permission denied. Because xserver and wayland will hold DRM-Master.
>>> I wonder if there is a way to run kmssink with wayland and x11?
>>
>> No, kmssink need to be DRM master.
>
> kmssink can use normal plane, but it should change some codes.
>
> "self->ctrl_fd = open ("/dev/dri/controlD64", O_RDWR); "
> "
> ret =
> drmModeSetPlane (self->ctrl_fd, self->plane_id,
> self->crtc_id, fb_id, 0, result.x, result.y, result.w, result.h,
> /* source/cropping coordinates are given in Q16 */
> src.x << 16, src.y << 16, src.w << 16, src.h << 16);
> "
>
> On rockchip platform, it works, thought it will have vsync problem
> because of legacy drm api.
>

= = It seems it didn't work with the latest mainline kernel now.
So the only way to run kmssink on wayland or x11 is kernel hack.

comment this funciton.
http://elixir.free-electrons.com/linux/latest/source/drivers/gpu/drm/drm_ioctl.c#L497



>>
>> Nicolas
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