• Anusha Srivatsa's avatar
    drm/i915: Add modular FIA · 0caf6257
    Anusha Srivatsa authored
    Some platforms may have Modular FIA. If Modular FIA is used in the SOC,
    then Display Driver will access the additional instances of
    FIA based on pre-assigned offset in GTTMADDR space.
    Each Modular FIA instance has its own IOSF Sideband Port ID
    and it houses only 2 Type-C Port. In SOC that has more than
    two Type-C Ports, there are multiple instances of Modular FIA.
    Gunit will need to use different destination ID when it access
    different pair of Type-C Port.
    The DFLEXDPSP register has Modular FIA bit starting on Tiger Lake.  If
    Modular FIA is used in the SOC, this register bit exists in all the
    instances of Modular FIA. IOM FW is required to program only the MF bit
    in first FIA instance that houses the Type-C Port 0 and Port 1, for
    Display Driver to read from.
    v2 (Lucas):
      - Move all accesses to FIA to be contained in intel_tc.c, along with
        display_fia that is now called tc_phy_fia
      - Save the fia instance number on intel_digital_port, so we don't have
        to query if modular FIA is used on every access
    v3 (Lucas): Make function static
    v4 (Lucas): Move enum phy_fia to the header and use it in
       intel_digital_port (suggested by Ville)
    v5 (Lucas): Add comment about the mapping between FIA and TC port
       (suggested by Stuart)
    Cc: Jani Nikula <jani.nikula@intel.com>
    Signed-off-by: default avatarAnusha Srivatsa <anusha.srivatsa@intel.com>
    Signed-off-by: default avatarLucas De Marchi <lucas.demarchi@intel.com>
    Acked-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
    Reviewed-by: default avatarStuart Summers <stuart.summers@intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20190712055706.12143-2-lucas.demarchi@intel.com