drm/nouveau/disp: add dp sst config method
This is presently unused on HW, we read a bunch of regs and calculate
the watermark during the second supervisor interrupt.
I don't want to change this yet as I need to re-remember how older HW
works exactly, but RM wants this info via RPC.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-35-lyude@redhat.com
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