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gpu: nvgpu: async cmd resp for gv11b

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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 PG EVENT: 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 msg.
- After disallow command is sent from the driver, NvGPU driver
  waits/polls for disallow command ack. This is sent immediately
  by msg 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 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 erros  as PMU is still
  processing DISALLOW cmd but the driver progressed further.

Bug 3580271

Change-Id: I332180c05b6a398107f065d54e9718b7038fb1b2
Signed-off-by: Divya <dsinghatwari@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2689500
Reviewed-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Divya
2022-03-29 19:18:49 +00:00
committed by mobile promotions
parent 43ba356132
commit fb019bf43a
6 changed files with 43 additions and 10 deletions
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4
drivers/gpu/nvgpu/common/pmu/ipc/pmu_msg.c
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@@ -202,8 +202,8 @@ static int pmu_handle_event(struct nvgpu_pmu *pmu, struct pmu_msg *msg)
}
break;
case PMU_UNIT_PG:
if (pmu->pg->process_rpc_event != NULL) {
err = pmu->pg->process_rpc_event(g, (void *)&msg->hdr);
if (pmu->pg->process_pg_event != NULL) {
err = pmu->pg->process_pg_event(g, (void *)&msg->hdr);
}
break;
default: