Re: [Intel-gfx] [PULL] topic/dp-hdmi-2.1-pcon for drm-misc-next

[Jani Nikula <jani.nikula@intel.com>]

On Thu, 07 Jan 2021, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Wed, Dec 23, 2020 at 10:14:58AM +0200, Jani Nikula wrote:
>> 
>> Hi Maarten, Maxime, and Thomas -
>> 
>> Here's the DP-HDMI2.1 PCON support topic pull consisting of the series
>> [1]. The series is split roughly 50-50 between drm helpers and i915, so
>> a topic branch seemed to be the right way to go.
>> 
>> I'll also pull this to drm-intel-next once you've merged to
>> drm-misc-next.
>
> I didn't see this merged into drm-misc-next, so pulled into drm-next. I'm
> processing an entire batch of pulls, I'll ping you on irc when it's all
> ready for backmerging.

Thanks, Rodrigo covered the backmerge.

BR,
Jani.

>
> Cheers, Daniel
>
>> 
>> BR,
>> Jani.
>> 
>> 
>> [1] https://patchwork.freedesktop.org/series/82098/
>> 
>> 
>> topic/dp-hdmi-2.1-pcon-2020-12-23:
>> Add support for DP-HDMI2.1 PCON
>> 
>> From the series cover letter:
>> 
>> This patch series attempts to add support for a DP-HDMI2.1 Protocol
>> Convertor. The VESA spec for the HDMI2.1 PCON are proposed in Errata
>> E5 to DisplayPort_v2.0:
>> https://vesa.org/join-vesamemberships/member-downloads/?action=stamp&fileid=42299
>> The details are mentioned in:
>> VESA DP-to-HDMI PCON Specification Standalone Document
>> https://groups.vesa.org/wg/DP/document/15651
>> 
>> This series starts with adding support for FRL (Fixed Rate Link)
>> Training between the PCON and HDMI2.1 sink.
>> As per HDMI2.1 specification, a new data-channel or lane is added in
>> FRL mode, by repurposing the TMDS clock Channel. Through FRL, higher
>> bit-rate can be supported, ie. up to 12 Gbps/lane (48 Gbps over 4
>> lanes).
>> 
>> With these patches, the HDMI2.1 PCON can be configured to achieve FRL
>> training based on the maximum FRL rate supported by the panel, source
>> and the PCON.
>> The approach is to add the support for FRL training between PCON and
>> HDMI2.1 sink and gradually add other blocks for supporting higher
>> resolutions and other HDMI2.1 features, that can be supported by pcon
>> for the sources that do not natively support HDMI2.1.
>> 
>> This is done before the DP Link training between the source and PCON
>> is started. In case of FRL training is not achieved, the PCON will
>> work in the regular TMDS mode, without HDMI2.1 feature support.
>> Any interruption in FRL training between the PCON and HDMI2.1 sink is
>> notified through IRQ_HPD. On receiving the IRQ_HPD the concerned DPCD
>> registers are read and FRL training is re-attempted.
>> 
>> Currently, we have tested the FRL training and are able to enable 4K
>> display with TGL Platform + Realtek PCON RTD2173 with HDMI2.1 supporting
>> panel.
>> 
>> The following changes since commit b3bf99daaee96a141536ce5c60a0d6dba6ec1d23:
>> 
>>   drm/i915/display: Defer initial modeset until after GGTT is initialised (2020-11-26 11:01:52 +0000)
>> 
>> are available in the Git repository at:
>> 
>>   git://anongit.freedesktop.org/drm/drm-intel tags/topic/dp-hdmi-2.1-pcon-2020-12-23
>> 
>> for you to fetch changes up to 522508b665df3bbfdf40381d4e61777844b1703f:
>> 
>>   drm/i915/display: Let PCON convert from RGB to YCbCr if it can (2020-12-22 17:59:07 +0200)
>> 
>> ----------------------------------------------------------------
>> Add support for DP-HDMI2.1 PCON
>> 
>> From the series cover letter:
>> 
>> This patch series attempts to add support for a DP-HDMI2.1 Protocol
>> Convertor. The VESA spec for the HDMI2.1 PCON are proposed in Errata
>> E5 to DisplayPort_v2.0:
>> https://vesa.org/join-vesamemberships/member-downloads/?action=stamp&fileid=42299
>> The details are mentioned in:
>> VESA DP-to-HDMI PCON Specification Standalone Document
>> https://groups.vesa.org/wg/DP/document/15651
>> 
>> This series starts with adding support for FRL (Fixed Rate Link)
>> Training between the PCON and HDMI2.1 sink.
>> As per HDMI2.1 specification, a new data-channel or lane is added in
>> FRL mode, by repurposing the TMDS clock Channel. Through FRL, higher
>> bit-rate can be supported, ie. up to 12 Gbps/lane (48 Gbps over 4
>> lanes).
>> 
>> With these patches, the HDMI2.1 PCON can be configured to achieve FRL
>> training based on the maximum FRL rate supported by the panel, source
>> and the PCON.
>> The approach is to add the support for FRL training between PCON and
>> HDMI2.1 sink and gradually add other blocks for supporting higher
>> resolutions and other HDMI2.1 features, that can be supported by pcon
>> for the sources that do not natively support HDMI2.1.
>> 
>> This is done before the DP Link training between the source and PCON
>> is started. In case of FRL training is not achieved, the PCON will
>> work in the regular TMDS mode, without HDMI2.1 feature support.
>> Any interruption in FRL training between the PCON and HDMI2.1 sink is
>> notified through IRQ_HPD. On receiving the IRQ_HPD the concerned DPCD
>> registers are read and FRL training is re-attempted.
>> 
>> Currently, we have tested the FRL training and are able to enable 4K
>> display with TGL Platform + Realtek PCON RTD2173 with HDMI2.1 supporting
>> panel.
>> 
>> ----------------------------------------------------------------
>> Ankit Nautiyal (11):
>>       drm/edid: Parse DSC1.2 cap fields from HFVSDB block
>>       drm/dp_helper: Add Helpers for FRL Link Training support for DP-HDMI2.1 PCON
>>       drm/dp_helper: Add support for Configuring DSC for HDMI2.1 Pcon
>>       drm/dp_helper: Add helpers to configure PCONs RGB-YCbCr Conversion
>>       drm/i915: Capture max frl rate for PCON in dfp cap structure
>>       drm/i915: Add support for starting FRL training for HDMI2.1 via PCON
>>       drm/i915: Check for FRL training before DP Link training
>>       drm/i915: Read DSC capabilities of the HDMI2.1 PCON encoder
>>       drm/i915: Add helper functions for calculating DSC parameters for HDMI2.1
>>       drm/i915/display: Configure PCON for DSC1.1 to DSC1.2 encoding
>>       drm/i915/display: Let PCON convert from RGB to YCbCr if it can
>> 
>> Swati Sharma (4):
>>       drm/edid: Add additional HFVSDB fields for HDMI2.1
>>       drm/edid: Parse MAX_FRL field from HFVSDB block
>>       drm/dp_helper: Add support for link failure detection
>>       drm/i915: Add support for enabling link status and recovery
>> 
>>  drivers/gpu/drm/drm_dp_helper.c                    | 566 +++++++++++++++++++++
>>  drivers/gpu/drm/drm_edid.c                         | 103 ++++
>>  drivers/gpu/drm/i915/display/intel_ddi.c           |   6 +-
>>  drivers/gpu/drm/i915/display/intel_display_types.h |  10 +
>>  drivers/gpu/drm/i915/display/intel_dp.c            | 440 +++++++++++++++-
>>  drivers/gpu/drm/i915/display/intel_dp.h            |   7 +-
>>  drivers/gpu/drm/i915/display/intel_hdmi.c          | 233 +++++++++
>>  drivers/gpu/drm/i915/display/intel_hdmi.h          |   7 +
>>  include/drm/drm_connector.h                        |  49 ++
>>  include/drm/drm_dp_helper.h                        | 218 ++++++++
>>  include/drm/drm_edid.h                             |  30 ++
>>  11 files changed, 1650 insertions(+), 19 deletions(-)
>> 
>> -- 
>> Jani Nikula, Intel Open Source Graphics Center

-- 
Jani Nikula, Intel Open Source Graphics Center
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