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drm/bridge: tc358767: Detect bridge mode from connected endpoints in DT

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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>
Tested-by: Lucas Stach <l.stach@pengutronix.de> # In both DPI to eDP and DSI to DPI mode.
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>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220329085015.39159-10-marex@denx.de
This commit is contained in:
Marek Vasut 2022-03-29 10:50:13 +02:00 committed by Robert Foss
parent dd1fd5ab7c
commit 71f7d9c031
No known key found for this signature in database
GPG Key ID: 3EFD900F76D1D784
1 changed files with 45 additions and 1 deletions
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46
drivers/gpu/drm/bridge/tc358767.c
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@ -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;