TCON TOP is different from other nodes in graph by having 3 input and 3 output ports. Additionally, connection to TV TCON might lead back to HDMI mux input port, creating loops.
Add support for traversing such graph.
Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net --- drivers/gpu/drm/sun4i/sun4i_drv.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c index 20193d6f33ba..e6c62c079146 100644 --- a/drivers/gpu/drm/sun4i/sun4i_drv.c +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -26,6 +26,7 @@ #include "sun4i_frontend.h" #include "sun4i_framebuffer.h" #include "sun4i_tcon.h" +#include "sun8i_tcon_top.h"
DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
@@ -197,6 +198,11 @@ static bool sun4i_drv_node_is_tcon(struct device_node *node) return !!of_match_node(sun4i_tcon_of_table, node); }
+static bool sun4i_drv_node_is_tcon_top(struct device_node *node) +{ + return !!of_match_node(sun8i_tcon_top_of_table, node); +} + static int compare_of(struct device *dev, void *data) { DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", @@ -258,6 +264,18 @@ static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, if (sun4i_drv_node_is_tcon(node)) { struct of_endpoint endpoint;
+ /* + * TCON TOP is always probed before TCON. However, TCON + * points back to TCON TOP when it is source for HDMI. + * We have to skip it here to prevent infinite looping + * between TCON TOP and TCON. + */ + if (sun4i_drv_node_is_tcon_top(remote)) { + DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); + of_node_put(remote); + continue; + } + if (of_graph_parse_endpoint(ep, &endpoint)) { DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); of_node_put(remote); @@ -318,6 +336,12 @@ static int sun4i_drv_add_endpoints(struct device *dev, /* each node has at least one output */ sun4i_drv_traverse_endpoints(list, node, 1);
+ /* TCON TOP has second and third output */ + if (sun4i_drv_node_is_tcon_top(node)) { + sun4i_drv_traverse_endpoints(list, node, 3); + sun4i_drv_traverse_endpoints(list, node, 5); + } + return count; }