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

[Ville Syrjälä]

On Wed, Feb 21, 2024 at 12:47:53AM -0800, Vivek Kasireddy wrote:
> 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#n2032
> 
> ---
> 
> 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.

> 
> 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