drm/ast: Store each HW cursor offset after pinning the rsp BO
As HW cursor BOs never move, we can store the offset in VRAM in the cursor-plane's HWC state. This removes the last possible source of runtime errors from atomic_update. Signed-off-by:Thomas Zimmermann <tzimmermann@suse.de> Acked-by:
Gerd Hoffmann <kraxel@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210209134632.12157-10-tzimmermann@suse.de
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