Despite its name, the omap_dss_get_next_device() function operates on display devices only. Make it more generic by allowing operation on all devices, with a parameter to specify the device type.
While at it rename the function to omapdss_device_get_next() to match the naming of the other functions operating on struct omap_dss_device.
Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Sebastian Reichel sebastian.reichel@collabora.co.uk --- drivers/gpu/drm/omapdrm/dss/base.c | 52 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/omapdrm/dss/display.c | 49 --------------------------------- drivers/gpu/drm/omapdrm/dss/omapdss.h | 6 ++-- 3 files changed, 56 insertions(+), 51 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) { diff --git a/drivers/gpu/drm/omapdrm/dss/display.c b/drivers/gpu/drm/omapdrm/dss/display.c index e7872e0c8dab..5df73cd76153 100644 --- a/drivers/gpu/drm/omapdrm/dss/display.c +++ b/drivers/gpu/drm/omapdrm/dss/display.c @@ -92,52 +92,3 @@ void omap_dss_put_device(struct omap_dss_device *dssdev) module_put(dssdev->owner); } EXPORT_SYMBOL(omap_dss_put_device); - -/* - * ref count of the found device is incremented. - * ref count of from-device is decremented. - */ -struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from) -{ - struct list_head *l; - struct omap_dss_device *dssdev; - - mutex_lock(&panel_list_mutex); - - if (list_empty(&panel_list)) { - dssdev = NULL; - goto out; - } - - if (from == NULL) { - dssdev = list_first_entry(&panel_list, struct omap_dss_device, - panel_list); - omap_dss_get_device(dssdev); - goto out; - } - - omap_dss_put_device(from); - - list_for_each(l, &panel_list) { - dssdev = list_entry(l, struct omap_dss_device, panel_list); - if (dssdev == from) { - if (list_is_last(l, &panel_list)) { - dssdev = NULL; - goto out; - } - - dssdev = list_entry(l->next, struct omap_dss_device, - panel_list); - omap_dss_get_device(dssdev); - goto out; - } - } - - WARN(1, "'from' dssdev not found\n"); - - dssdev = NULL; -out: - mutex_unlock(&panel_list_mutex); - return dssdev; -} -EXPORT_SYMBOL(omap_dss_get_next_device); diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h index a6ddc881ea72..94a3f98bdd3d 100644 --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h @@ -489,11 +489,15 @@ static inline bool omapdss_is_initialized(void)
int omapdss_register_display(struct omap_dss_device *dssdev); void omapdss_unregister_display(struct omap_dss_device *dssdev); +#define for_each_dss_display(d) \ + while ((d = omapdss_device_get_next(d, true)) != NULL)
void omapdss_device_register(struct omap_dss_device *dssdev); void omapdss_device_unregister(struct omap_dss_device *dssdev); struct omap_dss_device *omapdss_find_device_by_port(struct device_node *src, unsigned int port); +struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from, + bool display_only); int omapdss_device_connect(struct omap_dss_device *src, struct omap_dss_device *dst); void omapdss_device_disconnect(struct omap_dss_device *src, @@ -501,8 +505,6 @@ void omapdss_device_disconnect(struct omap_dss_device *src,
struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev); void omap_dss_put_device(struct omap_dss_device *dssdev); -#define for_each_dss_display(d) while ((d = omap_dss_get_next_device(d)) != NULL) -struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from);
int omap_dss_get_num_overlay_managers(void);