| Message ID | 20230221095054.1868277-6-treapking@chromium.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Register Type-C mode-switch in DP bridge endpoints | expand |
On Tue, Feb 21, 2023 at 05:50:49PM +0800, Pin-yen Lin wrote: > The output port endpoints can be connected to USB-C connectors. > Running drm_of_find_panel_or_bridge() with such endpoints leads to > a continuous return value of -EPROBE_DEFER, even though there is > no panel present. > > To avoid this, check for the existence of a "mode-switch" property in > the port endpoint, and skip panel registration completely if so. ... > + port_node = of_graph_get_port_by_id(np, 1); > + fwnode_for_each_typec_mode_switch(&port_node->fwnode, fwnode) { > + fwnode_handle_put(fwnode); > + return 0; > + } With the proposed count API: unsigned int count; ... port_node = ... count = typec_mode_switch_node_count(&port_node->fwnode); if (count == 0) return 0;
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 6846199a2ee1..486b5099f5dd 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -1648,7 +1648,8 @@ static int anx7625_get_swing_setting(struct device *dev, static int anx7625_parse_dt(struct device *dev, struct anx7625_platform_data *pdata) { - struct device_node *np = dev->of_node, *ep0; + struct device_node *np = dev->of_node, *ep0, *port_node; + struct fwnode_handle *fwnode; int bus_type, mipi_lanes; anx7625_get_swing_setting(dev, pdata); @@ -1687,6 +1688,16 @@ static int anx7625_parse_dt(struct device *dev, if (of_property_read_bool(np, "analogix,audio-enable")) pdata->audio_en = 1; + /* + * Don't bother finding a panel if a Type-C `mode-switch` property is + * present in one of the endpoints in the output port. + */ + port_node = of_graph_get_port_by_id(np, 1); + fwnode_for_each_typec_mode_switch(&port_node->fwnode, fwnode) { + fwnode_handle_put(fwnode); + return 0; + } + pdata->panel_bridge = devm_drm_of_get_bridge(dev, np, 1, 0); if (IS_ERR(pdata->panel_bridge)) { if (PTR_ERR(pdata->panel_bridge) == -ENODEV) {
The output port endpoints can be connected to USB-C connectors. Running drm_of_find_panel_or_bridge() with such endpoints leads to a continuous return value of -EPROBE_DEFER, even though there is no panel present. To avoid this, check for the existence of a "mode-switch" property in the port endpoint, and skip panel registration completely if so. Signed-off-by: Pin-yen Lin <treapking@chromium.org> --- Changes in v12: - Updated to use fwnode_for_each_typec_mode_switch macro - Dropped collected tags Changes in v10: - Collected Reviewed-by and Tested-by tags Changes in v6: - New in v6 drivers/gpu/drm/bridge/analogix/anx7625.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)