drm/vc4: Let gpiolib know that we're OK with sleeping for HPD.

Fixes an error thrown every few seconds when we poll HPD when it's on
a I2C to GPIO expander.
Signed-off-by: NEric Anholt <eric@anholt.net>
Tested-by: NDaniel Stone <daniels@collabora.com>

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -166,7 +166,7 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
 	if (vc4->hdmi->hpd_gpio) {
-		if (gpio_get_value(vc4->hdmi->hpd_gpio))
+		if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio))
 			return connector_status_connected;
 		else
 			return connector_status_disconnected;