drm/bridge: tc358767: remove check for video mode in link enable

tc_main_link_enable() checks if videomode has been set, and fails if
there's no videomode. As tc_main_link_enable() no longer depends on the
videomode, we can drop the check.

Also, while tc_stream_enable() does depend on the videomode, we can
expect that a mode has been set before drm_bridge_funcs.enable is
called, so we don't need the check there either.

Signed-off-by: Tomi Valkeinen <[e-mail]>
Reviewed-by: Andrzej Hajda <[e-mail]>
Signed-off-by: Andrzej Hajda <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/bridge/tc358767.c

···
 	int ret;
 	u8 tmp[8];
 
-	/* display mode should be set at this point */
-	if (!tc->mode)
-		return -EINVAL;
-
 	dev_dbg(tc->dev, "link enable\n");
 
 	tc_read(DP0CTL, &value);