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Don't use planes currently in-use on other CRTCs on first commit

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When doing the first commit, libliftoff will try to disable all
candidate planes. This is necessary to make sure we start atomic
test commits from a clean state, and are able to incrementally come
up with a combination which works.

However, disabling a plane currently in-use on another CRTC (e.g.
a primary plane) will result in failed commits. We can't steal that
plane without removing it from the other CRTC first.

Add a new liftoff_plane.crtc_id field populated with the current
CRTC ID for the plane.
This commit is contained in:
Simon Ser 2022-08-18 22:01:31 +02:00
parent bcfca8f602
commit a3dc9c48e4
3 changed files with 19 additions and 6 deletions
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21
alloc.c
View file

@ -427,7 +427,7 @@ output_choose_layers(struct liftoff_output *output, struct alloc_result *result,
cursor = drmModeAtomicGetCursor(result->req);
if (plane->layer != NULL) {
if (plane->crtc_id != 0) {
goto skip;
}
if ((plane->possible_crtcs & (1 << output->crtc_index)) == 0) {
@ -498,14 +498,18 @@ skip:
}
static int
apply_current(struct liftoff_device *device, drmModeAtomicReq *req)
apply_current(struct liftoff_output *output, drmModeAtomicReq *req)
{
struct liftoff_plane *plane;
int cursor, ret;
cursor = drmModeAtomicGetCursor(req);
liftoff_list_for_each(plane, &device->planes, link) {
liftoff_list_for_each(plane, &output->device->planes, link) {
if (plane->crtc_id != 0 && plane->crtc_id != output->crtc_id) {
continue;
}
ret = plane_apply(plane, plane->layer, req);
assert(ret != -EINVAL);
if (ret != 0) {
@ -595,7 +599,7 @@ reuse_previous_alloc(struct liftoff_output *output, drmModeAtomicReq *req,
cursor = drmModeAtomicGetCursor(req);
ret = apply_current(device, req);
ret = apply_current(output, req);
if (ret != 0) {
return ret;
}
@ -714,6 +718,10 @@ liftoff_output_apply(struct liftoff_output *output, drmModeAtomicReq *req,
plane->layer->plane = NULL;
plane->layer = NULL;
}
if (plane->crtc_id == output->crtc_id) {
plane->crtc_id = 0;
}
}
/* Disable all planes we might use. Do it before building mappings to
@ -721,7 +729,7 @@ liftoff_output_apply(struct liftoff_output *output, drmModeAtomicReq *req,
* enabled. */
candidate_planes = 0;
liftoff_list_for_each(plane, &device->planes, link) {
if (plane->layer == NULL) {
if (plane->crtc_id == 0) {
candidate_planes++;
liftoff_log(LIFTOFF_DEBUG,
"Disabling plane %"PRIu32, plane->id);
@ -786,13 +794,14 @@ liftoff_output_apply(struct liftoff_output *output, drmModeAtomicReq *req,
assert(plane->layer == NULL);
assert(layer->plane == NULL);
plane->layer = layer;
plane->crtc_id = layer->output->crtc_id;
layer->plane = plane;
}
if (i == 0) {
liftoff_log(LIFTOFF_DEBUG, " (No layer has a plane)");
}
ret = apply_current(device, req);
ret = apply_current(output, req);
if (ret != 0) {
return ret;
}

3
include/private.h
View file

@ -70,6 +70,9 @@ struct liftoff_plane {
size_t props_len;
struct liftoff_layer *layer;
/* Used to avoid picking planes currently in-use by other CRTCs on first
* commit */
uint32_t crtc_id;
};
struct liftoff_plane_property {

1
plane.c
View file

@ -66,6 +66,7 @@ liftoff_plane_create(struct liftoff_device *device, uint32_t id)
}
plane->id = drm_plane->plane_id;
plane->possible_crtcs = drm_plane->possible_crtcs;
plane->crtc_id = drm_plane->crtc_id;
drmModeFreePlane(drm_plane);
drm_props = drmModeObjectGetProperties(device->drm_fd, id,