ACK Re: [SRU][Noble][PATCH 0/8] Fix panel flickering issue when i915.psr2 is enabled

[Timo Aaltonen]

Hui Wang kirjoitti 16.4.2024 klo 9.04:
> BugLink: https://bugs.launchpad.net/bugs/2046315
> 
> [Impact]
> In Dell oem project, we found the graphic is flickering on some
> machines, finally we narrowed down the issue on (some specific panels +
> i915.psr2 enabled), and the issue was reported to Intel, Intel fixed
> the issue in the most recent mainline kernel. Here backporting the
> patches to Noble kernel.
> 
> It is hard to backport the patches to mantic and oem-6.5, so we wrote
> a workaround patch to disable the psr2 for those pannels in the oem-6.5.
> 
> https://gitlab.freedesktop.org/drm/intel/-/issues/9739
> 
> [Fix]
> cherry-pick 8 patches from mainline kernel
> 
> [Test]
> I applied the patches to Noble kernel and built a testing kernel, and
> Dell validated the testing kernel on those machines, the graphic
> didn't flicker anymore.
> 
> I installed the testing kernel on some machines with Intel 13th, 12th
> 11th and 10th gen cpu, the grahic worked well too.
> 
> [Where problems could occur]
> This patchset changes the fast wake settings for some gpu, it is
> possible to make the graphic flicker, but this possibility is very
> low, since the patchset comes from mainline kernel and we validated
> the patchset on different gens of Intel cpus.
> 
> 
> Jouni Högander (8):
>    drm/i915/alpm: Add ALPM register definitions
>    drm/i915/psr: Add alpm_parameters struct
>    drm/i915/alpm: Calculate ALPM Entry check
>    drm/i915/alpm: Alpm aux wake configuration for lnl
>    drm/i915/display: Make intel_dp_aux_fw_sync_len available for PSR code
>    drm/i915/psr: Improve fast and IO wake lines calculation
>    drm/i915/psr: Calculate IO wake and fast wake lines for DISPLAY_VER <
>      12
>    drm/i915/display: Increase number of fast wake precharge pulses
> 
>   .../drm/i915/display/intel_display_types.h    |  11 +-
>   drivers/gpu/drm/i915/display/intel_dp_aux.c   |  10 +-
>   drivers/gpu/drm/i915/display/intel_dp_aux.h   |   1 +
>   drivers/gpu/drm/i915/display/intel_psr.c      | 118 ++++++++++++++----
>   drivers/gpu/drm/i915/display/intel_psr_regs.h |  57 +++++++++
>   5 files changed, 170 insertions(+), 27 deletions(-)
> 

Acked-by: Timo Aaltonen <timo.aaltonen at canonical.com>

needed for the migration from oem-6.5 to hwe-6.8


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