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@pengutronix.de Signed-off-by: Marek Vasut marex@denx.de Cc: Jonas Karlman jonas@kwiboo.se Cc: Laurent Pinchart Laurent.pinchart@ideasonboard.com Cc: Maxime Ripard maxime@cerno.tech Cc: Neil Armstrong narmstrong@baylibre.com Cc: Sam Ravnborg sam@ravnborg.org --- 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;