| commit | 7a21dd93db048fbc6e17d32026f9ab7ea34db37e | [log] [tgz] |
|---|---|---|
| author | Arman Uguray <armansito@fuchsia.infra.roller.google.com> | Thu Aug 19 17:43:24 2021 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Aug 19 10:45:03 2021 -0700 |
| tree | bf11f7a213904ca024e38f66c86e15bee9e8531e | |
| parent | 444cf7836c834229810dae8927294a1718d9c28d [diff] |
[roll] Roll fuchsia [display][amlogic] Stop relying on RDMA IRQ for config reporting The amlogic-display driver's vsync pipeline no longer depends on status updates over the RDMA irq to determine the most recently applied config, which has been determined to be unreliable, especially in certain conditions in which the entire state machine can stall indefinitely. This CL makes the following changes as we continue to investigate the root causes of the RDMA stall: 1. The RDMA IRQ is now only used for diagnostics. 2. The RDMA register configuration and the determination of the most recently applied image is now performed entirely on each vsync IRQ. Since the RDMA control and status registers are only written from the vsync thread (in the general case outside of shutdown), their state is deterministic. 3. It has been experimentally determined that any scheduled RDMA is often complete by the time the vsync IRQ handler executes. Thus, the condition-variable-based signaling of RDMA completion has been removed. 4. The existing `rdma_stalls` metric is now defunct. This has been replaced by two counters that track submitted RDMA requests and interrupts. A new stall metric can be built by measuring a sustained difference between the two counters. Original-Bug: 80995, b/189400236 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/570066 Original-Revision: 723e0f29cd28460c5c30fdbbe00642d588a167da GitOrigin-RevId: 3031874e0afe26f292f5381f41ee47353f5c492a Change-Id: I4b273f01c8577bfa03d4fd7161dd829108e87229
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