1. 09 Jun, 2020 1 commit
    • Matt Roper's avatar
      drm/i915/rkl: RKL uses ABOX0 for pixel transfers · 62afef28
      Matt Roper authored
      Rocket Lake uses the same 'abox0' mechanism to handle pixel data
      transfers from memory that gen11 platforms used, rather than the
      abox1/abox2 interfaces used by TGL/DG1.  For the most part this is a
      hardware implementation detail that's transparent to driver software,
      but we do have to program a couple of tuning registers (MBUS_ABOX_CTL
      and BW_BUDDY registers) according to which ABOX instances are used by a
      platform.  Let's track the platform's ABOX usage in the device info
      structure and use that to determine which instances of these registers
      to program.
      
      As an exception to this rule is that even though TGL/DG1 use ABOX1+ABOX2
      for data transfers, we're still directed to program the ABOX_CTL
      register for ABOX0; so we'll handle that as a special case.
      
      v2:
       - Store the mask of platform-specific abox registers in the device
         info structure.
       - Add a TLB_REQ_TIMER() helper macro.  (Aditya)
      
      v3:
       - Squash ABOX and BW_BUDDY patches together and use a single mask for
         both of them, plus a special-case for programming the ABOX0 instance
         on all gen12.  (Ville)
      
      Bspec: 50096
      Bspec: 49218
      Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
      Cc: Aditya Swarup <aditya.swarup@intel.com>
      Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20200606025740.3308880-2-matthew.d.roper@intel.comReviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      62afef28
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