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backend/drm: extract current mode logic into separate function 

Extract the logic to fetch the current mode to a separate function
to make it more readable. Stop dying in an assert when
get_drm_prop_blob() fails. Always make it so the drmModeModeInfo
pointer is allocated so that we can free() it unconditionally.
This commit is contained in:
Simon Ser 2022-10-13 15:37:22 +02:00
parent eeb7a81138
commit ca432ea539
1 changed files with 32 additions and 20 deletions
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52
backend/drm/drm.c
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@ -1157,6 +1157,35 @@ static struct wlr_drm_crtc *connector_get_current_crtc(
return NULL;
}
static drmModeModeInfo *connector_get_current_mode(
struct wlr_drm_connector *wlr_conn, const drmModeConnector *drm_conn) {
struct wlr_drm_backend *drm = wlr_conn->backend;
if (wlr_conn->crtc == NULL) {
return NULL;
}
if (wlr_conn->crtc->props.mode_id != 0) {
size_t size = 0;
drmModeModeInfo *mode = get_drm_prop_blob(drm->fd, wlr_conn->crtc->id,
wlr_conn->crtc->props.mode_id, &size);
assert(mode == NULL || size == sizeof(*mode));
return mode;
} else {
// Fallback to the legacy API
if (!wlr_conn->crtc->legacy_crtc->mode_valid) {
return NULL;
}
drmModeModeInfo *mode = malloc(sizeof(*mode));
if (mode == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
*mode = wlr_conn->crtc->legacy_crtc->mode;
return mode;
}
}
static void connect_drm_connector(struct wlr_drm_connector *wlr_conn,
const drmModeConnector *drm_conn) {
struct wlr_drm_backend *drm = wlr_conn->backend;
@ -1225,21 +1254,8 @@ static void connect_drm_connector(struct wlr_drm_connector *wlr_conn,
// Before iterating on the conn's modes, get the current KMS mode
// in use from the connector's CRTC.
drmModeModeInfo *current_modeinfo = NULL;
if (wlr_conn->crtc != NULL) {
if (wlr_conn->crtc->props.mode_id == 0) {
// Use the legacy drm interface.
if (wlr_conn->crtc->legacy_crtc->mode_valid) {
current_modeinfo = &wlr_conn->crtc->legacy_crtc->mode;
}
} else {
// Use the modern atomic drm interface.
size_t modeinfo_size = 0;
current_modeinfo = get_drm_prop_blob(drm->fd, wlr_conn->crtc->id,
wlr_conn->crtc->props.mode_id, &modeinfo_size);
assert(modeinfo_size == sizeof(drmModeModeInfo));
}
}
drmModeModeInfo *current_modeinfo =
connector_get_current_mode(wlr_conn, drm_conn);
wlr_log(WLR_INFO, "Detected modes:");
@ -1277,11 +1293,7 @@ static void connect_drm_connector(struct wlr_drm_connector *wlr_conn,
wl_list_insert(wlr_conn->output.modes.prev, &mode->wlr_mode.link);
}
if (wlr_conn->crtc != NULL && wlr_conn->crtc->props.mode_id != 0) {
// free() the modeinfo pointer, but only
// if not using the legacy API.
free(current_modeinfo);
}
free(current_modeinfo);
wlr_conn->possible_crtcs =
drmModeConnectorGetPossibleCrtcs(drm->fd, drm_conn);