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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
This commit is contained in:
Jernej Skrabec 2018-06-25 14:02:48 +02:00 committed by Maxime Ripard
parent 71f4796ac0
commit ef0cf6441f
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GPG Key ID: D2B4C094214DAF74
1 changed files with 24 additions and 0 deletions
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24
drivers/gpu/drm/sun4i/sun4i_drv.c
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@ -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;
}