drm/i915/dg2: Update modeset sequences
DG2 has some changes to the expected modesetting sequences when compared to gen12. Adjust our driver logic accordingly. Although the DP sequence is pretty similar to TGL's, there are some steps that change, so let's split the handling for that out into a separate function. v2: - Switch wait_for_us() -> _wait_for() so that we can parameterize the timeout rather than duplicating the macro call. (Jani) Bspec: 54128 Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Signed-off-by:Matt Roper <matthew.d.roper@intel.com> Reviewed-by:
Lucas De Marchi <lucas.demarchi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210723174239.1551352-27-matthew.d.roper@intel.com
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