Messages in this thread | | | From | Daniel Stone <> | Date | Tue, 9 Jan 2024 22:32:18 +0000 | Subject | Re: [PATCH 2/7] drm/uAPI: Add "active color format" drm property as feedback for userspace |
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Hi,
On Tue, 9 Jan 2024 at 18:12, Andri Yngvason <andri@yngvason.is> wrote: > + * active color format: > + * This read-only property tells userspace the color format actually used > + * by the hardware display engine "on the cable" on a connector. The chosen > + * value depends on hardware capabilities, both display engine and > + * connected monitor. Drivers shall use > + * drm_connector_attach_active_color_format_property() to install this > + * property. Possible values are "not applicable", "rgb", "ycbcr444", > + * "ycbcr422", and "ycbcr420".
How does userspace determine what's happened without polling? Will it only change after an `ALLOW_MODESET` commit, and be guaranteed to be updated after the commit has completed and the event being sent? Should it send a HOTPLUG event? Other?
Cheers, Daniel
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