cxl: Add interleave encoding validity helpers

Some callers of ways_to_eiw(), granularity_to_eig(), and
eig_to_granularity() only need to determine whether an input is valid,
but must provide storage for a converted value that is then discarded.
This obscures the purpose of the call and requires unnecessary temporary
variables.

Define and use new helpers that provide a validation-only interface for
those callers.

cxl_port_setup_targets() also encodes and then decodes its calculated
granularity solely to validate it. Calculate the granularity directly
and validate it instead, making the calculation explicit and removing
the encode/decode round trip.

No functional change.

Suggested-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Richard Cheng <icheng@nvidia.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Link: https://patch.msgid.link/272dd3f8462c651093e61e814a2f394c602340f7.1793649898.git.alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions