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- When DISALLOW cmd is sent from driver to PMU the actual completion of the disallow will be acknowledged by PMU via a new RPC: ASYNC_CMD_RESP. - Disallow needs a delayed ACK from PMU in order to disable the ELPG. - If ELPG is already engaged, the DISALLOW cmd will trigger ELPG exit and then transition to PMU_PG_STATE_DISALLOW. - After this whole process is completed, PMU will send DISALLOW_ACK through ASYNC_CMD_RESP RPC. - After disallow command is sent from the driver, NvGPU driver waits/polls for disallow command ack. This is sent immediately by RPC framework of PMU. - Then, the driver will poll/wait for ASYNC_CMD_RESP event which is the delayed DISALLOW ACK. - The driver captures the ASYNC_CMD_RESP RPC sent from PMU. - set disallow_state to ELPG_OFF. - If the driver does not wait/poll for this delayed disallow ack from PMU, it can result in pmu halt issues as PMU is still processing DISALLOW cmd but the driver progressed further which can result in errors. Bug 3430273 Bug 3439350 Change-Id: If2acf8391d18cd3c6b8b07e3bf6577667ec99eea Signed-off-by: Divya <dsinghatwari@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2631214 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Seema Khowala <seemaj@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit