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Add DG2-specific DPLL manager infrastructure for MPLLB-backed port PLLs.
Introduce PLL id mapping, DG2-specific DPLL callbacks for
enable/disable/readout/frequency calculation, and manager callbacks
for compute/get/dump/compare. The platform is not switched over yet.
DG2's PLL-to-encoder lookup prefers the active encoder using the PLL,
but fall back to a matching encoder for the fixed port-to-PLL mapping
when no active user can be identified.
This keeps the active-user fix for operational paths while allowing
readout and verification paths to resolve the PHY even when
pll->active_mask does not identify an active user.
v2: Use intel_encoder_is_dig_port() to filter out
MST virtual encoders (Imre)
Assisted-by: Copilot:claude-sonnet-4-6
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> (v1)
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Link: https://patch.msgid.link/20260630115336.1059976-3-mika.kahola@intel.com
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