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backend/drm: implement KMS state snapshot/restore

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Following ideas from [1], snapshot the entire KMS state when the VT
is switched away, and restore it when the VT is switched back.

> Well the neat trick is that userspace doesn’t need to be able to
> understand properties to save and restore them - the actual property
> value transport between kernel and userspace is fully generic.

That way, even if another DRM master changes a property we don't
understand like CTM or HDR_OUTPUT_METADATA, we can switch it back
and avoid getting garbage on screen.

[1]: https://blog.ffwll.ch/2016/01/vt-switching-with-atomic-modeset.html
This commit is contained in:
Simon Ser 2022-10-18 18:23:55 +02:00
parent e0b2bf2a6b
commit f0bb53c4ab
7 changed files with 155 additions and 20 deletions
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3
include/backend/drm/iface.h
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@ -17,6 +17,8 @@ struct wlr_drm_interface {
bool (*crtc_commit)(struct wlr_drm_connector *conn,
const struct wlr_drm_connector_state *state, uint32_t flags,
bool test_only);
bool (*snapshot_state)(struct wlr_drm_backend *drm);
bool (*restore_state)(struct wlr_drm_backend *drm);
};
extern const struct wlr_drm_interface atomic_iface;
@ -24,5 +26,6 @@ extern const struct wlr_drm_interface legacy_iface;
bool drm_legacy_crtc_set_gamma(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc, size_t size, uint16_t *lut);
bool legacy_restore_state(struct wlr_drm_backend *drm);
#endif