[Intel-gfx] [RFC PATCH 0/6] drm/i915: Implement HDCP

[Ville Syrjälä]

On Thu, Nov 30, 2017 at 08:50:38AM +0100, Daniel Vetter wrote:
> On Wed, Nov 29, 2017 at 10:08:55PM -0500, Sean Paul wrote:
> > Here's the RFC for my i915 HDCP patchset. The UABI is based on what we've been
> > using in Chrome for the past 3 years. I posted the property to the list back
> > then, but never had a mainline driver to implement it. I do now :-)
> > 
> > Things are mostly in place, danvet gave me some feedback that I will
> > incorporate in v1. However, in the interest of gaining more early feedback, I'm
> > posting this now.
> > 
> > TODO:
> > - Add kerneldoc for property
> 
> The big thing I'd like to see here is clear description of the flows
> between kernel and userspace (since there's no helpers on the kernel side
> to standardize this).
> 
> One thing we discussed in that context is the addition of an uevent (like
> we do for anything else that changes with connectors, link_status is one
> example). But since the hdcp spec explicitly demands that the video player
> must poll the status an event is moot and won't be used. And I'm no fan of
> speculative uapi :-)

Speaking of uapi... Do we have an open source userspace and igts for
this somewhere?

I'm also concerned about debugging this. It will be a real PITA
to do if we can't even test it easily.

> 
> > - Fix '//' comments
> > - Change to MIT license
> > - Rebase on Ville's gmbus fixes (thanks Ville)
> > - Improve documentation on drm_intel_hdcp_shim
> > - Fix async commit locking (ie: don't use connection_mutex)
> > - Don't change connector->state in enable, defer to worker
> 
> Same holds for the disable callback, you can't touch state in there.
> 
> With the link_status prop (which is somewhat similar) we only reset it in
> atomic_check (where we hold the state locks) and in the async worker (same
> applies).
> -Daniel
> 
> > - Add igt coverage for the feature.
> > 
> > Thanks!
> > 
> > Sean
> > 
> > 
> > Sean Paul (6):
> >   drm: Add Content Protection property
> >   drm: Add some HDCP related #defines
> >   drm/i915: Add HDCP framework + base implementation
> >   drm/i915: Add function to output Aksv over GMBUS
> >   drm/i915: Implement HDCP for HDMI
> >   drm/i915: Implement HDCP for DisplayPort
> > 
> >  drivers/gpu/drm/drm_atomic.c        |   8 +
> >  drivers/gpu/drm/drm_connector.c     |  43 +++
> >  drivers/gpu/drm/drm_sysfs.c         |  29 ++
> >  drivers/gpu/drm/i915/Makefile       |   1 +
> >  drivers/gpu/drm/i915/i915_drv.h     |   1 +
> >  drivers/gpu/drm/i915/i915_reg.h     |  85 +++++
> >  drivers/gpu/drm/i915/intel_atomic.c |  26 +-
> >  drivers/gpu/drm/i915/intel_ddi.c    |  64 ++++
> >  drivers/gpu/drm/i915/intel_dp.c     | 243 +++++++++++++-
> >  drivers/gpu/drm/i915/intel_drv.h    |  53 +++
> >  drivers/gpu/drm/i915/intel_hdcp.c   | 636 ++++++++++++++++++++++++++++++++++++
> >  drivers/gpu/drm/i915/intel_hdmi.c   | 253 ++++++++++++++
> >  drivers/gpu/drm/i915/intel_i2c.c    |  54 ++-
> >  include/drm/drm_connector.h         |  16 +
> >  include/drm/drm_dp_helper.h         |  17 +
> >  include/drm/drm_hdcp.h              |  44 +++
> >  include/uapi/drm/drm_mode.h         |   4 +
> >  17 files changed, 1560 insertions(+), 17 deletions(-)
> >  create mode 100644 drivers/gpu/drm/i915/intel_hdcp.c
> >  create mode 100644 include/drm/drm_hdcp.h
> > 
> > -- 
> > 2.15.0.531.g2ccb3012c9-goog
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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-- 
Ville Syrjälä
Intel OTC