The TAGFIFO state is now reset in mgag200_g200er_reset_tagfifo().

v2:
	* define MGAREG_SEQ1_SCROFF
Signed-off-by: NThomas Zimmermann <tzimmermann@suse.de>
Tested-by: NJohn Donnelly <John.p.donnelly@oracle.com>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Acked-by: NEmil Velikov <emil.velikov@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200515083233.32036-10-tzimmermann@suse.de