[PATCH v5 00/14] DP MST Refactors + debugging tools + suspend/resume reprobing

Lyude Paul
2019-10-22T02:35:55Z

This is the final portion of the large series for adding MST
suspend/resume reprobing that I've been working on for quite a while
now. In addition, I:

* Refactored and cleaned up any code I ended up digging through in the
process of understanding how some parts of these helpers worked.
* Added some debugging tools along the way that I ended up needing to
figure out some issues in my own code

Note that there's still one important part of this process missing
that's not included in this patch series: EDID reprobing, which I
believe Stanislav Lisovskiy from Intel is currently working on. The main
purpose of this series is to fix the issue of the in-memory topology
state (e.g. connectors connected to an MST hub, branch devices, etc.)
going out of sync if a topology connected to a connector is swapped out
with a different topology while the system is resumed, or while the
device housing said connector is in runtime suspend.

As well, the debugging tools that are added in this include:
* A limited debugging utility for dumping the list of topology
references on an MST port or branch connector whose topology reference
count has reached 0
<sideband message dumping has been merged :)>

Lyude Paul (14):
drm/dp_mst: Destroy MSTBs asynchronously
drm/dp_mst: Remove PDT teardown in drm_dp_destroy_port() and refactor
drm/dp_mst: Refactor pdt setup/teardown, add more locking
drm/dp_mst: Handle UP requests asynchronously
drm/dp_mst: Add probe_lock
drm/dp_mst: Protect drm_dp_mst_port members with locking
drm/dp_mst: Don't forget to update port->input in
drm_dp_mst_handle_conn_stat()
drm/dp_mst: Lessen indenting in drm_dp_mst_topology_mgr_resume()
drm/nouveau: Don't grab runtime PM refs for HPD IRQs
drm/nouveau: Resume hotplug interrupts earlier
drm/amdgpu: Iterate through DRM connectors correctly
drm/amdgpu/dm: Resume short HPD IRQs before resuming MST topology
drm/dp_mst: Add basic topology reprobing when resuming
drm/dp_mst: Add topology ref history tracking for debugging

drivers/gpu/drm/Kconfig | 14 +
.../gpu/drm/amd/amdgpu/amdgpu_connectors.c | 13 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 20 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 5 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c | 40 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 5 +-
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 34 +-
drivers/gpu/drm/amd/amdgpu/dce_v11_0.c | 34 +-
drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 40 +-
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 34 +-
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 41 +-
.../drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 10 +-
.../display/amdgpu_dm/amdgpu_dm_mst_types.c | 28 +-
drivers/gpu/drm/drm_dp_mst_topology.c | 1185 +++++++++++++----
drivers/gpu/drm/i915/display/intel_dp.c | 3 +-
drivers/gpu/drm/i915/display/intel_dp_mst.c | 28 +-
drivers/gpu/drm/nouveau/dispnv50/disp.c | 38 +-
drivers/gpu/drm/nouveau/nouveau_connector.c | 33 +-
drivers/gpu/drm/nouveau/nouveau_display.c | 19 +-
drivers/gpu/drm/radeon/radeon_dp_mst.c | 24 +-
include/drm/drm_dp_mst_helper.h | 160 ++-
21 files changed, 1329 insertions(+), 479 deletions(-)

--
2.21.0

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