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backend/drm: introduce drm_connector_alloc_crtc 

This function allocates a CRTC for a connector if necessary.
This commit is contained in:
Simon Ser 2021-04-06 19:30:57 +02:00 committed by Kenny Levinsen
parent 63f891e393
commit b180d3482f
1 changed files with 14 additions and 5 deletions
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19
backend/drm/drm.c
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@ -727,6 +727,19 @@ static void attempt_enable_needs_modeset(struct wlr_drm_backend *drm) {
} }
} }
static bool drm_connector_alloc_crtc(struct wlr_drm_connector *conn) {
if (conn->crtc != NULL) {
return true;
}
bool prev_desired_enabled = conn->desired_enabled;
conn->desired_enabled = true;
realloc_crtcs(conn->backend);
conn->desired_enabled = prev_desired_enabled;
return conn->crtc != NULL;
}
static bool drm_connector_set_mode(struct wlr_drm_connector *conn, static bool drm_connector_set_mode(struct wlr_drm_connector *conn,
const struct wlr_output_state *state) { const struct wlr_output_state *state) {
struct wlr_drm_backend *drm = conn->backend; struct wlr_drm_backend *drm = conn->backend;
@ -763,11 +776,7 @@ static bool drm_connector_set_mode(struct wlr_drm_connector *conn,
return false; return false;
} }
if (conn->crtc == NULL) { if (!drm_connector_alloc_crtc(conn)) {
// Maybe we can steal a CRTC from a disabled output
realloc_crtcs(drm);
}
if (conn->crtc == NULL) {
wlr_drm_conn_log(conn, WLR_ERROR, wlr_drm_conn_log(conn, WLR_ERROR,
"Cannot perform modeset: no CRTC for this connector"); "Cannot perform modeset: no CRTC for this connector");
return false; return false;