[Intel-gfx] [RFC PATCH 0/3] i915 writeback private framework

[Kandpal, Suraj]

++Laurent ,Dmitry, and Abhinav

Hi,
Can you have a look at the private implementation i915 is currently going with till
we can figure out how  to work with drm core .

Regards,
Suraj Kandpal
> A patch series was floated in the drm mailing list which aimed to change the
> drm_connector and drm_encoder fields to pointer in the
> drm_connector_writeback structure, this received a huge pushback from the
> community but since i915 expects each connector present in the drm_device
> list to be a intel_connector but drm_writeback framework.
> [1] https://patchwork.kernel.org/project/dri-
> devel/patch/20220202081702.22119-1-suraj.kandpal at intel.com/
> [2] https://patchwork.kernel.org/project/dri-
> devel/patch/20220202085429.22261-6-suraj.kandpal at intel.com/
> This forces us to use a drm_connector which is not embedded in
> intel_connector the current drm_writeback framework becomes very
> unfeasible to us as it would mean a lot of checks at a lot of places to take into
> account the above issue.Since no one had an issue with encoder field being
> changed into a pointer it was decided to break the connector and encoder
> pointer changes into two different series.The encoder field changes is
> currently being worked upon by Abhinav Kumar
> [3]https://patchwork.kernel.org/project/dri-devel/list/?series=633565
> In the meantime for i915 to start using the writeback functionality we came
> up with a interim solution to own writeback pipeline bypassing one provided
> by drm which is what these patches do.
> Note: these are temp patches till we figure out how we can either change
> drm core writeback to work with our intel_connector structure or find a
> different solution which allows us to work with the current drm_writeback
> framework
> 
> Suraj Kandpal (3):
>   drm/i915: Creating writeback pipeline to bypass drm_writeback
>     framework
>   drm/i915: Define WD trancoder for i915
>   drm/i915: Enabling WD Transcoder
> 
>  drivers/gpu/drm/i915/Makefile                 |   2 +
>  drivers/gpu/drm/i915/display/intel_acpi.c     |   1 +
>  drivers/gpu/drm/i915/display/intel_display.c  |  89 +-
> drivers/gpu/drm/i915/display/intel_display.h  |  15 +
>  .../drm/i915/display/intel_display_types.h    |  18 +
>  drivers/gpu/drm/i915/display/intel_dpll.c     |   3 +
>  drivers/gpu/drm/i915/display/intel_opregion.c |   3 +
>  .../gpu/drm/i915/display/intel_wb_connector.c | 296 ++++++
> .../gpu/drm/i915/display/intel_wb_connector.h |  99 ++
>  drivers/gpu/drm/i915/display/intel_wd.c       | 978 ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_wd.h       |  82 ++
>  drivers/gpu/drm/i915/i915_drv.h               |   5 +
>  drivers/gpu/drm/i915/i915_irq.c               |   8 +-
>  drivers/gpu/drm/i915/i915_pci.c               |   7 +-
>  drivers/gpu/drm/i915/i915_reg.h               | 139 +++
>  15 files changed, 1742 insertions(+), 3 deletions(-)  create mode 100644
> drivers/gpu/drm/i915/display/intel_wb_connector.c
>  create mode 100644 drivers/gpu/drm/i915/display/intel_wb_connector.h
>  create mode 100644 drivers/gpu/drm/i915/display/intel_wd.c
>  create mode 100644 drivers/gpu/drm/i915/display/intel_wd.h
> 
> --
> 2.35.1