cxl/region: Factor out cxl_port_calc_interleave()

cxl_switch_port_setup_targets() calculates the interleave ways and
granularity of a port's decoder from the parent interleave and the number
of targets below the port, then validates the result. That calculation and
its checks are open coded between the target search and the decoder setup.

Move the calculation and its checks to a new helper,
cxl_port_calc_interleave(), so that the interleave for the port's decoder
is calculated and validated in one place.

No functional change.

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/cefd25ee5b9d600779a2dac442bd02110f571ff2.1793649898.git.alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions