[RFC v1 0/3] drm/i915: Add support for XRandR Border property

[Kasireddy, Vivek]

Hi Ville,

> > Some customers and users have expressed interest in adding borders
> > (or margins) to certain displays in their multi-display configurations.
> > To address this need, this patchset implements the XRandR Border
> > property as defined here:
> >
> https://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt#n2
> 032
> >
> > ---
> >
> > Patchset overview:
> >
> > Patch 1: Create skl_program_crtc_scaler() to program scaler for crtc
> > Patch 2: Create and attach the Border property to DP and HDMI
> > Patch 3: Implement Border property by enabling crtc scalar
> >
> > This series is tested using following method:
> > - Run the following xrandr command with different parameters:
> > xrandr --output HDMI-3 --pos 1920x0 --mode 1280x1024 --fb 3840x2160 --
> scale 2.11x2.11 --set "Border" 150,0,150,0
> >
> > The following patch was also added to the modesetting driver to
> > implement the Border property:
> > https://gitlab.freedesktop.org/Vivek/xserver/-
> /commit/62abfc438f0d17fe7f88bf2826c9784c2b36443b
> 
> I have an old branch implementing the margin properties:
> https://github.com/vsyrjala/linux.git hdmi_margins_3
> 
> but it got stalled due to the scaler code being in a very poor state.
> I started sketching some reworks there, but that got put on the
> backburner due to other stuff:
> https://github.com/vsyrjala/linux.git scaler_rework_2
> 
> I might have somehting more recent than that locally, but I'd have
> to trawl through my branches to check what's the latest state.
There is a lot to unpack in these two branches than what I had anticipated.
However, it looks like some of the patches are already merged. Do
you have any plan to revive this work anytime soon?

And, besides the remaining unmerged patches in the above two branches,
are there still any other missing pieces preventing this feature from
getting merged?

Thanks,
Vivek

> 
> >
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Cc: Matt Roper <matthew.d.roper at intel.com>
> > Cc: Dongwon Kim <dongwon.kim at intel.com>
> >
> > Vivek Kasireddy (3):
> >   drm/i915: Rename skl_pfit_enable() to skl_program_crtc_scaler()
> >   drm/i915: Attach the Border property to DP and HDMI connectors
> >   drm/i915: Apply border adjustments and enable scaler on the crtc
> >
> >  drivers/gpu/drm/i915/display/intel_atomic.c   | 29 ++++++++++-
> >  .../gpu/drm/i915/display/intel_connector.c    | 49 +++++++++++++++++++
> >  .../gpu/drm/i915/display/intel_connector.h    |  3 ++
> >  drivers/gpu/drm/i915/display/intel_display.c  | 25 ++++++++--
> >  .../gpu/drm/i915/display/intel_display_core.h |  1 +
> >  .../drm/i915/display/intel_display_types.h    |  6 +++
> >  drivers/gpu/drm/i915/display/intel_dp.c       | 11 +++++
> >  drivers/gpu/drm/i915/display/intel_hdmi.c     | 11 +++++
> >  drivers/gpu/drm/i915/display/skl_scaler.c     | 27 ++++++----
> >  drivers/gpu/drm/i915/display/skl_scaler.h     |  3 +-
> >  10 files changed, 149 insertions(+), 16 deletions(-)
> >
> > --
> > 2.43.0
> 
> --
> Ville Syrjälä
> Intel