[PATCH 00/14] drm/hdcp: Pull HDCP auth/exchange/check into

[Sean Paul]

On Mon, Sep 13, 2021 at 2:05 PM Alex Deucher <alexdeucher at gmail.com> wrote:
>
> On Mon, Sep 13, 2021 at 1:57 PM Sean Paul <sean at poorly.run> wrote:
> >
> > From: Sean Paul <seanpaul at chromium.org>
> >
> > Hello,
> > This patchset pulls the HDCP protocol auth/exchange/check logic out from
> > i915 into a HDCP helper library which drivers can use to implement the
> > proper protocol and UAPI interactions for achieving HDCP.
> >
> > Originally this was all stuffed into i915 since it was the only driver
> > supporting HDCP. Over the last while I've been working on HDCP support
> > in the msm driver and have identified the parts which can/should be
> > shared between drivers and the parts which are hw-specific.
> >
> > We can generalize all of the sink interactions in the helper as well as
> > state handling and link checks. This tends to be the trickiest part of
> > adding HDCP support, since the property state and locking is a bit of a
> > nightmare. The driver need only implement the more mechanical display
> > controller register accesses.
> >
> > The first third of the pachset is establishing the helpers, the next
> > third is converting the i915 driver to use the helpers, and the last
> > third is the msm driver implementation.
> >
> > I've left out HDCP 2.x support, since we still only have i915 as the
> > reference implementation and I'm not super comfortable speculating on
> > which parts are platform independent.
>
> FWIW, amdgpu has support for both HDCP 1.x and 2.x
>

Thanks Alex, I knew this and neglected to mention it, apologies for
the omission.

IIRC amdgpu is much less hands-on than i915/msm, with PSP doing most
of the heavy lifting. There's probably some value in using the helpers
since it'll handle the state transitions in a consistent manner, do
you think this is something you can use?

Sean


> Alex
>
> >
> > Please take a look,
> >
> > Sean
> >
> > Sean Paul (14):
> >   drm/hdcp: Add drm_hdcp_atomic_check()
> >   drm/hdcp: Avoid changing crtc state in hdcp atomic check
> >   drm/hdcp: Update property value on content type and user changes
> >   drm/hdcp: Expand HDCP helper library for enable/disable/check
> >   drm/i915/hdcp: Consolidate HDCP setup/state cache
> >   drm/i915/hdcp: Retain hdcp_capable return codes
> >   drm/i915/hdcp: Use HDCP helpers for i915
> >   drm/msm/dpu_kms: Re-order dpu includes
> >   drm/msm/dpu: Remove useless checks in dpu_encoder
> >   drm/msm/dpu: Remove encoder->enable() hack
> >   drm/msm/dp: Re-order dp_audio_put in deinit_sub_modules
> >   dt-bindings: msm/dp: Add bindings for HDCP registers
> >   drm/msm: Add hdcp register ranges to sc7180 device tree
> >   drm/msm: Implement HDCP 1.x using the new drm HDCP helpers
> >
> >  .../bindings/display/msm/dp-controller.yaml   |   11 +-
> >  drivers/gpu/drm/drm_hdcp.c                    | 1198 ++++++++++++++++-
> >  drivers/gpu/drm/i915/display/intel_atomic.c   |    7 +-
> >  drivers/gpu/drm/i915/display/intel_ddi.c      |   29 +-
> >  .../drm/i915/display/intel_display_debugfs.c  |   11 +-
> >  .../drm/i915/display/intel_display_types.h    |   58 +-
> >  drivers/gpu/drm/i915/display/intel_dp_hdcp.c  |  341 ++---
> >  drivers/gpu/drm/i915/display/intel_dp_mst.c   |   17 +-
> >  drivers/gpu/drm/i915/display/intel_hdcp.c     | 1011 +++-----------
> >  drivers/gpu/drm/i915/display/intel_hdcp.h     |   35 +-
> >  drivers/gpu/drm/i915/display/intel_hdmi.c     |  256 ++--
> >  drivers/gpu/drm/msm/Makefile                  |    1 +
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   |   17 +-
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       |   30 +-
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h       |    2 -
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h     |    4 -
> >  drivers/gpu/drm/msm/dp/dp_debug.c             |   49 +-
> >  drivers/gpu/drm/msm/dp/dp_debug.h             |    6 +-
> >  drivers/gpu/drm/msm/dp/dp_display.c           |   47 +-
> >  drivers/gpu/drm/msm/dp/dp_display.h           |    5 +
> >  drivers/gpu/drm/msm/dp/dp_drm.c               |   68 +-
> >  drivers/gpu/drm/msm/dp/dp_drm.h               |    5 +
> >  drivers/gpu/drm/msm/dp/dp_hdcp.c              |  433 ++++++
> >  drivers/gpu/drm/msm/dp/dp_hdcp.h              |   27 +
> >  drivers/gpu/drm/msm/dp/dp_parser.c            |   30 +-
> >  drivers/gpu/drm/msm/dp/dp_parser.h            |    4 +
> >  drivers/gpu/drm/msm/dp/dp_reg.h               |   44 +-
> >  drivers/gpu/drm/msm/msm_atomic.c              |   15 +
> >  include/drm/drm_hdcp.h                        |  194 +++
> >  29 files changed, 2570 insertions(+), 1385 deletions(-)
> >  create mode 100644 drivers/gpu/drm/msm/dp/dp_hdcp.c
> >  create mode 100644 drivers/gpu/drm/msm/dp/dp_hdcp.h
> >
> > --
> > Sean Paul, Software Engineer, Google / Chromium OS
> >