[PATCH v1] drm/vkms: Add writeback encoders as possible clones

[Dmitry Baryshkov]

On Thu, Jul 03, 2025 at 11:03:35AM +0200, Robert Mader wrote:
> Since commit 41b4b11da0215 ("drm: Add valid clones check") setting
> the `possible_clones` values is a hard requirement for cloning.
> `vkms` supports cloning for writeback connectors in order to capture
> CRTC content, however that broke with said commit.
> 
> Writeback connectors are created on a per-CRTC basis, thus mark
> every non-writeback connector that is compatible with a given CRTC
> as possible clone - and vice-versa.
> 
> Using a default configuration, the corresponding `drm_info` output
> changes from:

It feels like the current possible_clones is incorrect according to the
documentation. Should there be a Fixes tag?


> 
> 
> Signed-off-by: Robert Mader <robert.mader at collabora.com>
> ---
>  drivers/gpu/drm/vkms/vkms_output.c    | 12 ++++++++++++
>  drivers/gpu/drm/vkms/vkms_writeback.c |  2 ++
>  2 files changed, 14 insertions(+)
> 

-- 
With best wishes
Dmitry