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    Subject[PATCH v6 4/7] drm/bridge: anx7625: Check for Type-C during panel registration
    Date
    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 v6:
    - New in v6

    drivers/gpu/drm/bridge/analogix/anx7625.c | 13 ++++++++++++-
    1 file changed, 12 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
    index b0ff1ecb80a5..b9e3d6ad8846 100644
    --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
    +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
    @@ -1650,7 +1650,7 @@ 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, *sw;
    int bus_type, mipi_lanes;

    anx7625_get_swing_setting(dev, pdata);
    @@ -1689,6 +1689,17 @@ 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.
    + */
    + for_each_endpoint_of_node(np, sw) {
    + if (of_property_read_bool(sw, "mode-switch")) {
    + of_node_put(sw);
    + 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) {
    --
    2.38.1.584.g0f3c55d4c2-goog
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