diff options
Diffstat (limited to 'drivers/gpu/drm/omapdrm/dss/base.c')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/dss/base.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/base.c b/drivers/gpu/drm/omapdrm/dss/base.c index 8fac816ca481..9f01a4f28145 100644 --- a/drivers/gpu/drm/omapdrm/dss/base.c +++ b/drivers/gpu/drm/omapdrm/dss/base.c @@ -104,6 +104,58 @@ struct omap_dss_device *omapdss_find_device_by_port(struct device_node *src, return NULL; } +/* + * Search for the next device starting at @from. If display_only is true, skip + * non-display devices. Release the reference to the @from device, and acquire + * a reference to the returned device if found. + */ +struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from, + bool display_only) +{ + struct omap_dss_device *dssdev; + struct list_head *list; + + mutex_lock(&omapdss_devices_lock); + + if (list_empty(&omapdss_devices_list)) { + dssdev = NULL; + goto done; + } + + /* + * Start from the from entry if given or from omapdss_devices_list + * otherwise. + */ + list = from ? &from->list : &omapdss_devices_list; + + list_for_each_entry(dssdev, list, list) { + /* + * Stop if we reach the omapdss_devices_list, that's the end of + * the list. + */ + if (&dssdev->list == &omapdss_devices_list) { + dssdev = NULL; + goto done; + } + + /* Filter out non-display entries if display_only is set. */ + if (!display_only || dssdev->driver) + goto done; + } + + dssdev = NULL; + +done: + if (from) + omap_dss_put_device(from); + if (dssdev) + omap_dss_get_device(dssdev); + + mutex_unlock(&omapdss_devices_lock); + return dssdev; +} +EXPORT_SYMBOL(omapdss_device_get_next); + int omapdss_device_connect(struct omap_dss_device *src, struct omap_dss_device *dst) { |