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| author | Jernej Skrabec <jernej.skrabec@siol.net> | 2018-06-25 14:02:48 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2018-06-27 21:43:52 +0200 |
| commit | ef0cf6441fbb1ac4390e4fa4223d421a924fd458 (patch) | |
| tree | da3799e58e8f736148004ca7b63d430ab43ec673 | |
| parent | 71f4796ac09d6b634f4756388cfdbe9d778499e9 (diff) | |
| download | linux-ef0cf6441fbb1ac4390e4fa4223d421a924fd458.tar.bz2 | |
drm/sun4i: Add support for traversing graph with TCON TOP
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>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180625120304.7543-9-jernej.skrabec@siol.net
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_drv.c | 24 |
1 files changed, 24 insertions, 0 deletions
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; } |