The TC358767/TC358867/TC9595 are all capable of operating in multiple
modes, DPI-to-(e)DP, DSI-to-(e)DP, DSI-to-DPI. Only the first mode is
currently supported. It is possible to find out the mode in which the
bridge should be operated by testing connected endpoints in DT.
Port allocation:
port@0 - DSI input
port@1 - DPI input/output
port@2 - eDP output
Possible connections:
DPI -> port@1 -> port@2 -> eDP :: [port@0 is not connected]
DSI -> port@0 -> port@2 -> eDP :: [port@1 is not connected]
DSI -> port@0 -> port@1 -> DPI :: [port@2 is not connected]
Add function to determine the bridge mode based on connected endpoints.
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Jonas Karlman <jonas@xxxxxxxxx>
Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Maxime Ripard <maxime@xxxxxxxxxx>
Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
V2: - New patch
V3: - Add RB from Lucas
---
drivers/gpu/drm/bridge/tc358767.c | 46 ++++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 07da6142d5cf2..1ccb95704a4c9 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1684,6 +1684,50 @@ static int tc_probe_edp_bridge_endpoint(struct tc_data *tc)
return ret;
}
+static int tc_probe_bridge_endpoint(struct tc_data *tc)
+{
+ struct device *dev = tc->dev;
+ struct of_endpoint endpoint;
+ struct device_node *node = NULL;
+ const u8 mode_dpi_to_edp = BIT(1) | BIT(2);
+ const u8 mode_dsi_to_edp = BIT(0) | BIT(2);
+ const u8 mode_dsi_to_dpi = BIT(0) | BIT(1);
+ u8 mode = 0;
+
+ /*
+ * Determine bridge configuration.
+ *
+ * Port allocation:
+ * port@0 - DSI input
+ * port@1 - DPI input/output
+ * port@2 - eDP output
+ *
+ * Possible connections:
+ * DPI -> port@1 -> port@2 -> eDP :: [port@0 is not connected]
+ * DSI -> port@0 -> port@2 -> eDP :: [port@1 is not connected]
+ * DSI -> port@0 -> port@1 -> DPI :: [port@2 is not connected]
+ */
+
+ for_each_endpoint_of_node(dev->of_node, node) {
+ of_graph_parse_endpoint(node, &endpoint);
+ if (endpoint.port > 2)
+ return -EINVAL;
+
+ mode |= BIT(endpoint.port);
+ }
+
+ if (mode == mode_dpi_to_edp)
+ return tc_probe_edp_bridge_endpoint(tc);
+ else if (mode == mode_dsi_to_dpi)
+ dev_warn(dev, "The mode DSI-to-DPI is not supported!\n");
+ else if (mode == mode_dsi_to_edp)
+ dev_warn(dev, "The mode DSI-to-(e)DP is not supported!\n");
+ else
+ dev_warn(dev, "Invalid mode (0x%x) is not supported!\n", mode);
+
+ return -EINVAL;
+}
+
static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
@@ -1696,7 +1740,7 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
tc->dev = dev;
- ret = tc_probe_edp_bridge_endpoint(tc);
+ ret = tc_probe_bridge_endpoint(tc);
if (ret)
return ret;
--
2.34.1
