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Revert "backend/drm: Automatic non-blocking commits" 

This reverts commit 45ba35719e.

Sadly, this causes regressions on amdgpu [1] and even with these
fixed, there are fundamental issues with non-blocking modesets [2].

[1]: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3745
[2]: https://oftc.irclog.whitequark.org/dri-devel/2023-10-11#1697031838-1697036920;
This commit is contained in:
Simon Ser 2023-10-12 18:25:00 +02:00 committed by Simon Zeni
parent ecc7f01705
commit b82a53a918
1 changed files with 6 additions and 17 deletions
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23
backend/drm/atomic.c
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@ -68,21 +68,6 @@ static bool atomic_commit(struct atomic *atom,
}
int ret = drmModeAtomicCommit(drm->fd, atom->req, flags, drm);
// A non-blocking commit will fail with EBUSY if a commit is already in
// progress for the affected CRTCs, and the caller is responsible for
// waiting for page_flip events before queuing more non-blocking commits.
//
// The driver may implicitly add more CRTCs to our commit for e.g. resource
// reallocation, and in that case we have no chance of waiting for the
// right page_flip events. Retry with a blocking commit when this happens.
if (ret == -EBUSY &&
(flags & DRM_MODE_ATOMIC_NONBLOCK) &&
(flags & DRM_MODE_ATOMIC_ALLOW_MODESET)) {
flags &= ~DRM_MODE_ATOMIC_NONBLOCK;
ret = drmModeAtomicCommit(drm->fd, atom->req, flags, drm);
}
if (ret != 0) {
wlr_drm_conn_log_errno(conn,
(flags & DRM_MODE_ATOMIC_TEST_ONLY) ? WLR_DEBUG : WLR_ERROR,
@ -329,8 +314,12 @@ static bool atomic_crtc_commit(struct wlr_drm_connector *conn,
}
if (modeset) {
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
}
if (!test_only && conn->pending_page_flip_crtc == 0) {
} else if (!test_only && (state->base->committed & WLR_OUTPUT_STATE_BUFFER)) {
// The wlr_output API requires non-modeset commits with a new buffer to
// wait for the frame event. However compositors often perform
// non-modesets commits without a new buffer without waiting for the
// frame event. In that case we need to make the KMS commit blocking,
// otherwise the kernel will error out with EBUSY.
flags |= DRM_MODE_ATOMIC_NONBLOCK;
}