[PATCH v2 00/18] drm/i915: Pimp DP DFP handling

[Lyude Paul]

Will try to look at this today, if I don't have the time though I'll definitely
have the time on Tuesday

On Fri, 2020-09-04 at 14:53 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Attempt to deal with DP downstream facing ports (DFP) more
> thoroughly. This involves reading more of the port caps
> and dealing with various clock/bpc limitations.
> 
> And we try to enable YCbCr 444->420 conversion for HDMI DFPs
> which could allow some 4k displays to actually use 4k on
> pre-icl hardware (which doesn't have native 420 output),
> assuming we don't run into some other hardware limits.
> 
> I dropped my earlier patches to also hook in the DP dual mode
> adapter probing since sadly I've not actually seen a DP->DP++
> dongle that passes through the i2c traffic for those.
> 
> Only pimped the SST side of things. Not sure what would
> be required to get it all working for MST.
> 
> Ville Syrjälä (18):
>   drm/dp: Dump downstream facing port caps
>   drm/i915/lspcon: Do not send infoframes to non-HDMI sinks
>   drm/dp: Define protocol converter DPCD registers
>   drm/dp: Define more downstream facing port caps
>   drm/i915: Reworkd DFP max bpc handling
>   drm/dp: Add helpers to identify downstream facing port types
>   drm/dp: Pimp drm_dp_downstream_max_bpc()
>   drm/dp: Redo drm_dp_downstream_max_clock() as
>     drm_dp_downstream_max_dotclock()
>   drm/i915: Reworkd DP DFP clock handling
>   drm/dp: Add drm_dp_downstream_{min,max}_tmds_clock()
>   drm/i915: Deal with TMDS DFP clock limits
>   drm/i915: Configure DP 1.3+ protocol converted HDMI mode
>   drm/dp: Add drm_dp_downstream_mode()
>   drm/i915: Handle downstream facing ports w/o EDID
>   drm/i915: Extract intel_hdmi_has_audio()
>   drm/i915: DP->HDMI TMDS clock limits vs. deep color
>   drm/dp: Add helpers for DFP YCbCr 4:2:0 handling
>   drm/i915: Do YCbCr 444->420 conversion via DP protocol converters
> 
>  drivers/gpu/drm/drm_dp_helper.c               | 382 +++++++++++++++---
>  drivers/gpu/drm/drm_edid.c                    |  19 +
>  drivers/gpu/drm/i915/display/intel_ddi.c      |  11 +-
>  .../drm/i915/display/intel_display_debugfs.c  |   3 +-
>  .../drm/i915/display/intel_display_types.h    |   9 +
>  drivers/gpu/drm/i915/display/intel_dp.c       | 304 +++++++++++---
>  drivers/gpu/drm/i915/display/intel_dp.h       |   1 +
>  drivers/gpu/drm/i915/display/intel_hdmi.c     |  82 ++--
>  drivers/gpu/drm/i915/display/intel_hdmi.h     |   2 +
>  include/drm/drm_dp_helper.h                   |  63 ++-
>  include/drm/drm_edid.h                        |   4 +
>  11 files changed, 738 insertions(+), 142 deletions(-)
> 
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat