[PATCH 0/3] DC: Fix page flip timeouts on DCE 6

[Timur Kristóf]

Currently when using DC on DCE 6, it produces a page flip timeout
after a suspend/resume.

After some investigation, it turns out that the issue is because
DC uses different interrupts between DCE 6 and newer HW versions,
and it assumes that the VUPDATE interrupt is always present, when
in fact it's not. It also assumes that the HW is capable of VRR
when a VRR capable monitor is plugged in, when in fact this is
not the case.

This series marks VRR as unsupported on DCE 6 even when a VRR
capable monitor is plugged in. Furthermore, it fixes the code
trying to access the unregistered VUPDATE interrupt.

As a side note, I also attempted to actually use the same
interrupts as newer DCE versions, but this didn't work.
Apparently DCE 6 was not advertised with VRR support anyway.

Finally, there is also a patch to disable fast boot mode
on DCE 6. The rationale is that this already didn't work
on DCE 8, and even if it did I have no means to test it.

Timur Kristóf (3):
  drm/amd/display: Disable fastboot on DCE 6 too.
  drm/amd/display: Disable VRR on DCE 6
  drm/amd/display: Don't use non-registered VUPDATE on DCE 6

 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 26 ++++++++++++-------
 .../amd/display/amdgpu_dm/amdgpu_dm_crtc.c    | 16 +++++++-----
 drivers/gpu/drm/amd/display/dc/dc_helper.c    |  5 ++++
 drivers/gpu/drm/amd/display/dc/dm_services.h  |  2 ++
 .../amd/display/dc/hwss/dce110/dce110_hwseq.c |  6 ++---
 5 files changed, 35 insertions(+), 20 deletions(-)

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2.50.1