drm/i915/buf_trans: add vfunc for VS/PE-O

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Choosing correct table for Vswing / Pre-emphasis Override is platform
specific. It also requires different checks that are already used for
choosing predefined tables.

Add new get_buf_trans_override() vfunc into intel_encoder returning
deparsed table from VBT#57. In next patches, set it inside already
present if-ladder from intel_ddi_buf_trans_init() instead of duplicating
it.

Note that get_buf_trans() cannot be overwritten since there are cases
when we need to rollback although VS/PE-O was requested, eg. DP is not
connected or feature is not yet implemented for the platform. Assume
that vfunc returns NULL on rollback and return predefined tables.

Suggested-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Michał Grzelak <michal.grzelak@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260904123148.2165596-6-michal.grzelak@intel.com

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Michał Grzelak 2026-09-04 14:31:45 +02:00 • committed by Suraj Kandpal

parent a138a81d78

commit e084812de9

2 changed files with 11 additions and 0 deletions

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8

drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c

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3

drivers/gpu/drm/i915/display/intel_display_types.h

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