From 71f7d9c03118fc98c487e7ecd3a039da9c1cc513 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 29 Mar 2022 10:50:13 +0200 Subject: [PATCH] drm/bridge: tc358767: Detect bridge mode from connected endpoints in DT 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 Tested-by: Lucas Stach # In both DPI to eDP and DSI to DPI mode. Signed-off-by: Marek Vasut Cc: Jonas Karlman Cc: Laurent Pinchart Cc: Maxime Ripard Cc: Neil Armstrong Cc: Sam Ravnborg Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20220329085015.39159-10-marex@denx.de --- 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 470f3e9..074efe24 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1621,6 +1621,50 @@ 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; @@ -1633,7 +1677,7 @@ 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; -- 2.7.4