1. 24 Aug, 2018 1 commit
    • Paulo Zanoni's avatar
      drm/i915/icl: implement the tc/legacy HPD {dis,}connect flows · 39d1e234
      Paulo Zanoni authored
      Unlike the other ports, TC ports are not available to use as soon as
      we get a hotplug. The TC PHYs can be shared between multiple
      controllers: display, USB, etc. As a result, handshaking through FIA
      is required around connect and disconnect to cleanly transfer
      ownership with the controller and set the type-C power state.
      
      This patch implements the flow sequences described by our
      specification. We opt to grab ownership of the ports as soon as we get
      the hotplugs in order to simplify the interactions and avoid surprises
      in the user space side. We may consider changing this in the future,
      once we improve our testing capabilities on this area.
      
      v2:
       * This unifies the DP and HDMI patches so we can discuss everything
         at once so people looking at random single patches can actually
         understand the direction.
       * I found out the spec was updated a while ago. There's a small
         difference in the connect flow and the patch was updated for that.
       * Our spec also now gives a good explanation on what is really
         happening. As a result, comments were added.
       * Add some more comments as requested by Rodrigo (Rodrigo).
      v3:
       * Downgrade a DRM_ERROR that shouldn't ever happen but we can't act
         on in case it does (Chris).
      
      BSpec: 21750, 4250.
      Cc: Animesh Manna <animesh.manna@intel.com>
      Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
      Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
      Signed-off-by: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20180801173441.9789-1-paulo.r.zanoni@intel.com
      39d1e234
  2. 23 Aug, 2018 2 commits
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