Am Freitag, dem 18.02.2022 um 02:00 +0100 schrieb Marek Vasut:
> 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.
>
> 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>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> ---
> V2: - New patch
> ---
> 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 7dae18de76c97..4af0ad5db2148 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;
>
