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backend/drm: fix drmModePageFlip() when disabling CRTC on legacy uAPI

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drmModePageFlip() will fail with EBUSY on a disabled CRTC.

We can't fix this by clearing the DRM_MODE_PAGE_FLIP_EVENT when
performing a commit which disables CRTCs, because some device-wide
commits might also page-flip other enabled CRTCs (and skipping the
page-flip event would mess up our buffer tracking).

Fix this by immediately completing page-flips which disable a CRTC
on the legacy uAPI.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3918
(cherry picked from commit 3e651b4642)
This commit is contained in:
Simon Ser 2024-11-23 15:29:44 +01:00 • committed by Simon Zeni
parent bdc75d058b
commit f870d63bad
2 changed files with 14 additions and 2 deletions
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10
backend/drm/drm.c
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@ -577,6 +577,16 @@ static void drm_connector_apply_commit(const struct wlr_drm_connector_state *sta
conn->cursor_enabled = false;
conn->crtc = NULL;
// Legacy uAPI doesn't support requesting page-flip events when
// turning off a CRTC
if (page_flip != NULL && conn->backend->iface == &legacy_iface) {
drm_page_flip_pop(page_flip, crtc->id);
conn->pending_page_flip = NULL;
if (page_flip->connectors_len == 0) {
drm_page_flip_destroy(page_flip);
}
}
}
}