As soon as the GPIO driver part will be enabled in mcp2221_probe(), the first HID reports will be exchanged with the chip because the GPIO driver immediately calls mcp_gpio_get_direction(). HID I/O has to be enabled explicitly during mcp2221_probe() to receive response reports. Otherwise, all four mcp_gpio_get_direction() calls will run into the four second timeout of mcp_send_report(), which will block the driver for about 16s during startup. Signed-off-by: Enrik Berkhan <Enrik.Berkhan@xxxxxxx> --- drivers/hid/hid-mcp2221.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hid/hid-mcp2221.c b/drivers/hid/hid-mcp2221.c index 0ca2a7b96825..5d8898f3f2e3 100644 --- a/drivers/hid/hid-mcp2221.c +++ b/drivers/hid/hid-mcp2221.c @@ -902,6 +902,9 @@ static int mcp2221_probe(struct hid_device *hdev, mcp->gc->can_sleep = 1; mcp->gc->parent = &hdev->dev; + /* Enable reception of HID reports during GPIO initialization */ + hid_device_io_start(hdev); + ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp); if (ret) goto err_gc; -- 2.34.1
