The omap_dss_find_output_by_port_node() function defined in output.c looks up an output from its port node. To do so it needs to call helper functions from dss-of.c to lookup the port parent and the port number. As omap_dss_find_output_by_port_node() is only called by omapdss_of_find_source_for_first_ep() from dss-of.c this goes back and forth between the to source files and isn't very clear.
Simplify the code by passing both the parent and the port number to omap_dss_find_output_by_port_node() instead of the port node, and rename the function to omap_dss_find_output_by_port().
Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com --- drivers/gpu/drm/omapdrm/dss/dss-of.c | 39 ++++++++++++++++------------------- drivers/gpu/drm/omapdrm/dss/omapdss.h | 6 ++---- drivers/gpu/drm/omapdrm/dss/output.c | 17 +++------------ 3 files changed, 23 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/dss/dss-of.c b/drivers/gpu/drm/omapdrm/dss/dss-of.c index 4602a79c6c44..b51af09e9111 100644 --- a/drivers/gpu/drm/omapdrm/dss/dss-of.c +++ b/drivers/gpu/drm/omapdrm/dss/dss-of.c @@ -21,7 +21,8 @@
#include "omapdss.h"
-struct device_node *dss_of_port_get_parent_device(struct device_node *port) +static struct device_node * +dss_of_port_get_parent_device(struct device_node *port) { struct device_node *np; int i; @@ -45,40 +46,36 @@ struct device_node *dss_of_port_get_parent_device(struct device_node *port) return NULL; }
-u32 dss_of_port_get_port_number(struct device_node *port) -{ - int r; - u32 reg; - - r = of_property_read_u32(port, "reg", ®); - if (r) - reg = 0; - - return reg; -} - struct omap_dss_device * omapdss_of_find_source_for_first_ep(struct device_node *node) { - struct device_node *ep; + struct device_node *src_node; struct device_node *src_port; + struct device_node *ep; struct omap_dss_device *src; + u32 port_number = 0;
+ /* Get the endpoint... */ ep = of_graph_get_endpoint_by_regs(node, 0, 0); if (!ep) return ERR_PTR(-EINVAL);
+ /* ... and its remote port... */ src_port = of_graph_get_remote_port(ep); - if (!src_port) { - of_node_put(ep); - return ERR_PTR(-EINVAL); - } - of_node_put(ep); + if (!src_port) + return ERR_PTR(-EINVAL);
- src = omap_dss_find_output_by_port_node(src_port); - + /* ... and the remote port's number and parent... */ + of_property_read_u32(src_port, "reg", &port_number); + src_node = dss_of_port_get_parent_device(src_port); of_node_put(src_port); + if (!src_node) + return NULL; + + /* ... and finally the source. */ + src = omap_dss_find_output_by_port(src_node, port_number); + of_node_put(src_node);
return src ? src : ERR_PTR(-EPROBE_DEFER); } diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h index 320cf3383580..98b116514b51 100644 --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h @@ -574,7 +574,8 @@ int omap_dss_get_num_overlays(void); int omapdss_register_output(struct omap_dss_device *output); void omapdss_unregister_output(struct omap_dss_device *output); struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id); -struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port); +struct omap_dss_device *omap_dss_find_output_by_port(struct device_node *src, + unsigned int port); int omapdss_output_set_device(struct omap_dss_device *out, struct omap_dss_device *dssdev); int omapdss_output_unset_device(struct omap_dss_device *out); @@ -601,9 +602,6 @@ static inline bool omapdss_device_is_enabled(struct omap_dss_device *dssdev) struct omap_dss_device * omapdss_of_find_source_for_first_ep(struct device_node *node);
-struct device_node *dss_of_port_get_parent_device(struct device_node *port); -u32 dss_of_port_get_port_number(struct device_node *port); - enum dss_writeback_channel { DSS_WB_LCD1_MGR = 0, DSS_WB_LCD2_MGR = 1, diff --git a/drivers/gpu/drm/omapdrm/dss/output.c b/drivers/gpu/drm/omapdrm/dss/output.c index 7f18153a1bde..be254ea42e08 100644 --- a/drivers/gpu/drm/omapdrm/dss/output.c +++ b/drivers/gpu/drm/omapdrm/dss/output.c @@ -122,27 +122,16 @@ struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id) } EXPORT_SYMBOL(omap_dss_get_output);
-struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port) +struct omap_dss_device *omap_dss_find_output_by_port(struct device_node *src, + unsigned int port) { - struct device_node *src_node; struct omap_dss_device *out; - u32 reg; - - src_node = dss_of_port_get_parent_device(port); - if (!src_node) - return NULL; - - reg = dss_of_port_get_port_number(port);
list_for_each_entry(out, &output_list, output_list) { - if (out->dev->of_node == src_node && out->port_num == reg) { - of_node_put(src_node); + if (out->dev->of_node == src && out->port_num == port) return omap_dss_get_device(out); - } }
- of_node_put(src_node); - return NULL; }