[Intel-gfx] [PATCH 0/7] Add lspcon support

[Ville Syrjälä]

On Tue, Mar 22, 2016 at 07:55:01PM +0530, Shashank Sharma wrote:
> LSPCON is essentially an active DP-HDMI convertor. It has
> two modes of operations:
> - ls mode (for upto HDMI 1.4 outputs, 4k at 30 resoution / 297MHz) 
> - pcon mode (for upto HDMI 2.0 outputs, 4k at 60 resolution / 600 MHz)
> 
> This patch set adds support for LS mode of operation for GEN9
> platforms. It adds a new connector for lspcon, whcih is a mix
> and match of DP and HDMI connectors, matching dual personality
> of lspcon devices.
> 
> Notes:
> - Daniel Vetter gave a review comment on LSPCON design, to make
>   it a separate encoder. This patch set tries to match that expectations
>   with a separate connector, as DDI encoder already fulfills all the
>   requirements of a lspcon_encoder.
> - This patch set tagrets LS mode of operations only.
> - PCON mode of operation will be added later, based on the requirements.
>   This is to primarily unbloc Linux devices with LSPCON port.
> - This patch set is tested with BXT RVP + drm-nightly
> - As we redesigned this code, to meet the review comments, this is a working
>   patch set, but not upto commercial quality yet.

Quick glance tells me this is more or less just an in driver implementation
of the DP dual mode standard at this point. I recently posted some patches [1]
that implement dual mode support as a helper. So you should check it out
and try to layer whatever lspcon specifics on top of that.

The only thing missing from my patches was basically using i2c-over-aux
instead of gmbus for type2 adapters, but that's mostly just a matter of
passing the right i2c adapter to places.

[1] https://lists.freedesktop.org/archives/dri-devel/2016-February/101494.html

> 
> Shashank Sharma (7):
>   drm/i915: add lspcon vbt bit parsing
>   drm/i915: Add lspcon data structures
>   drm/i915: Add new lspcon file
>   drm/i915: Add and initialize lspcon connector
>   drm/i915: Add and register lspcon connector functions
>   drm/i915: Add lspcon core functions
>   drm/i915: Add lspcon hpd handler
> 
>  drivers/gpu/drm/i915/Makefile         |   3 +-
>  drivers/gpu/drm/i915/i915_drv.h       |   1 +
>  drivers/gpu/drm/i915/intel_bios.c     |  42 +++
>  drivers/gpu/drm/i915/intel_ddi.c      |   6 +
>  drivers/gpu/drm/i915/intel_dp.c       |  31 ++
>  drivers/gpu/drm/i915/intel_drv.h      |  35 +-
>  drivers/gpu/drm/i915/intel_hdmi.c     |  25 +-
>  drivers/gpu/drm/i915/intel_hotplug.c  |   2 +-
>  drivers/gpu/drm/i915/intel_lspcon.c   | 620 ++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_vbt_defs.h |   1 +
>  10 files changed, 759 insertions(+), 7 deletions(-)
>  create mode 100644 drivers/gpu/drm/i915/intel_lspcon.c
> 
> -- 
> 1.9.1
> 
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-- 
Ville Syrjälä
Intel OTC