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drm: rcar-du: lvds: Improve identification of panels

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Dual-LVDS panels are mistakenly identified as bridges, this
commit replaces the current logic with a call to
drm_of_find_panel_or_bridge to sort that out.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Fabrizio Castro 2019-12-17 13:45:57 +00:00 committed by Laurent Pinchart
parent 6529007522
commit 990e378db4
1 changed files with 10 additions and 65 deletions
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75
drivers/gpu/drm/rcar-du/rcar_lvds.c
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@ -21,6 +21,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
@ -712,79 +713,23 @@ static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds)
static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
{
struct device_node *local_output = NULL;
struct device_node *remote_input = NULL;
struct device_node *remote = NULL;
struct device_node *node;
bool is_bridge = false;
int ret = 0;
int ret;
local_output = of_graph_get_endpoint_by_regs(lvds->dev->of_node, 1, 0);
if (!local_output) {
dev_dbg(lvds->dev, "unconnected port@1\n");
ret = -ENODEV;
ret = drm_of_find_panel_or_bridge(lvds->dev->of_node, 1, 0,
&lvds->panel, &lvds->next_bridge);
if (ret)
goto done;
}
/*
* Locate the connected entity and infer its type from the number of
* endpoints.
*/
remote = of_graph_get_remote_port_parent(local_output);
if (!remote) {
dev_dbg(lvds->dev, "unconnected endpoint %pOF\n", local_output);
ret = -ENODEV;
goto done;
}
if (!of_device_is_available(remote)) {
dev_dbg(lvds->dev, "connected entity %pOF is disabled\n",
remote);
ret = -ENODEV;
goto done;
}
remote_input = of_graph_get_remote_endpoint(local_output);
for_each_endpoint_of_node(remote, node) {
if (node != remote_input) {
/*
* We've found one endpoint other than the input, this
* must be a bridge.
*/
is_bridge = true;
of_node_put(node);
break;
}
}
if (is_bridge) {
lvds->next_bridge = of_drm_find_bridge(remote);
if (!lvds->next_bridge) {
ret = -EPROBE_DEFER;
goto done;
}
if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK)
lvds->dual_link = lvds->next_bridge->timings
? lvds->next_bridge->timings->dual_link
: false;
} else {
lvds->panel = of_drm_find_panel(remote);
if (IS_ERR(lvds->panel)) {
ret = PTR_ERR(lvds->panel);
goto done;
}
}
if ((lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) &&
lvds->next_bridge)
lvds->dual_link = lvds->next_bridge->timings
? lvds->next_bridge->timings->dual_link
: false;
if (lvds->dual_link)
ret = rcar_lvds_parse_dt_companion(lvds);
done:
of_node_put(local_output);
of_node_put(remote_input);
of_node_put(remote);
/*
* On D3/E3 the LVDS encoder provides a clock to the DU, which can be
* used for the DPAD output even when the LVDS output is not connected.