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drm/sun4i: Add bridge support

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Our RGB bus can be either connected to a bridge or a panel. While the panel
support was already there, the bridge was not.

Fix that.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Maxime Ripard
2016-04-11 12:16:33 +02:00
parent a8444c7ee2
commit 894f5a9f4b
4 changed files with 87 additions and 19 deletions
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43
drivers/gpu/drm/sun4i/sun4i_tcon.c
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@@ -432,6 +432,40 @@ struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER);
}
struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
{
struct device_node *port, *remote, *child;
struct device_node *end_node = NULL;
/* Inputs are listed first, then outputs */
port = of_graph_get_port_by_id(node, 1);
/*
* Our first output is the RGB interface where the panel will
* be connected.
*/
for_each_child_of_node(port, child) {
u32 reg;
of_property_read_u32(child, "reg", &reg);
if (reg == 0)
end_node = child;
}
if (!end_node) {
DRM_DEBUG_DRIVER("Missing bridge endpoint\n");
return ERR_PTR(-ENODEV);
}
remote = of_graph_get_remote_port_parent(end_node);
if (!remote) {
DRM_DEBUG_DRIVER("Enable to parse remote node\n");
return ERR_PTR(-EINVAL);
}
return of_drm_find_bridge(remote) ?: ERR_PTR(-EPROBE_DEFER);
}
static int sun4i_tcon_bind(struct device *dev, struct device *master,
void *data)
{
@@ -514,19 +548,22 @@ static struct component_ops sun4i_tcon_ops = {
static int sun4i_tcon_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct drm_bridge *bridge;
struct drm_panel *panel;
/*
* The panel is not ready.
* Neither the bridge or the panel is ready.
* Defer the probe.
*/
panel = sun4i_tcon_find_panel(node);
bridge = sun4i_tcon_find_bridge(node);
/*
* If we don't have a panel endpoint, just go on
*/
if (PTR_ERR(panel) == -EPROBE_DEFER) {
DRM_DEBUG_DRIVER("Still waiting for our panel. Deferring...\n");
if ((PTR_ERR(panel) == -EPROBE_DEFER) &&
(PTR_ERR(bridge) == -EPROBE_DEFER)) {
DRM_DEBUG_DRIVER("Still waiting for our panel/bridge. Deferring...\n");
return -EPROBE_DEFER;
}