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

[Alex Deucher]

@Alex Hung
 can you pick these up as well?

Thanks,

Alex

On Mon, Aug 18, 2025 at 12:23 AM Alex Hung <alex.hung at amd.com> wrote:
>
> The series is Reviewed-by: Alex Hung <alex.hung at amd.com>
>
> The patch series is also tested in promotion test and CI without regression.
>
> On 8/2/25 10:05, Timur Kristóf wrote:
> > 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(-)
> >
>