[PATCH v3 2/8] drm/atomic: Add support for mouse hotspots

[Javier Martinez Canillas]

Pekka Paalanen <ppaalanen at gmail.com> writes:

> On Mon, 26 Jun 2023 23:58:33 -0400
> Zack Rusin <zack at kde.org> wrote:
>
>> From: Zack Rusin <zackr at vmware.com>
>> 
>> Atomic modesetting code lacked support for specifying mouse cursor
>> hotspots. The legacy kms DRM_IOCTL_MODE_CURSOR2 had support for setting
>> the hotspot but the functionality was not implemented in the new atomic
>> paths.
>> 
>> Due to the lack of hotspots in the atomic paths userspace compositors
>> completely disable atomic modesetting for drivers that require it (i.e.
>> all paravirtualized drivers).
>> 
>> This change adds hotspot properties to the atomic codepaths throughtout
>> the DRM core and will allow enabling atomic modesetting for virtualized
>> drivers in the userspace.
>> 
>> Signed-off-by: Zack Rusin <zackr at vmware.com>
>> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>> Cc: Maxime Ripard <mripard at kernel.org>
>> Cc: Thomas Zimmermann <tzimmermann at suse.de>
>> Cc: David Airlie <airlied at linux.ie>
>> Cc: Daniel Vetter <daniel at ffwll.ch>
>> ---
>>  drivers/gpu/drm/drm_atomic_state_helper.c | 14 +++++++
>>  drivers/gpu/drm/drm_atomic_uapi.c         | 20 +++++++++
>>  drivers/gpu/drm/drm_plane.c               | 51 +++++++++++++++++++++++
>>  include/drm/drm_plane.h                   | 15 +++++++
>>  4 files changed, 100 insertions(+)
>
> Hi Zack,
>
> where is the UAPI documentation for these new properties? I mean
> something ending up in the HTML docs like what other properties have in
> e.g. https://www.kernel.org/doc/html/latest/gpu/drm-kms.html#plane-composition-properties
>
> Otherwise looks fine to me. Could drm_plane_create_hotspot_properties()
> perhaps assert that the plane type is CURSOR?
>

I thought the same when reviewing but then I noticed this function is only
called from __drm_universal_plane_init() if type is DRM_PLANE_TYPE_CURSOR.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat