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On Hopper and Blackwell, FSP boots GSP with hardware lockdown enabled. After FSP Chain of Trust completes, the driver must poll for lockdown release before proceeding with GSP initialization. Add the register bit and helper functions needed for this polling. Signed-off-by: John Hubbard <jhubbard@nvidia.com> Link: https://patch.msgid.link/20260603-b4-blackwell-v13-7-d9f3a06939e0@nvidia.com [acourbot: fix `lockdown_released` logic and add explanatory comments.] Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>