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@xxxxxxxxxxxxxxx>
>
> 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
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