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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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2
include/backend/drm/util.h
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@ -16,6 +16,8 @@ const char *get_pnp_manufacturer(uint16_t code);
void parse_edid(struct wlr_drm_connector *conn, size_t len, const uint8_t *data);
const char *drm_connector_status_str(drmModeConnection status);
drmModeAtomicReq *snapshot_drm_state(int drm_fd);
// Part of match_obj
enum {
UNMATCHED = (uint32_t)-1,